Identical satellites x and y of mass m are in circular orbits around a planet of mass m. the radius of the planet is r. The ratio of the kinetic energies of satellite X to satellite Y is 4/3.
To determine the ratio of the kinetic energies of satellites X and Y, we can use the fact that the kinetic energy of an object in circular orbit is given by the equation
K = (1/2)m[tex]v^{2}[/tex]
Where K is the kinetic energy, m is the mass of the satellite, and v is the orbital velocity of the satellite.
For satellite X
The orbital radius of satellite X is 3r, so the orbital velocity of satellite X (vx) can be determined using the equation for centripetal acceleration
[tex]v^{2}[/tex] = (G * M) / r
Where G is the gravitational constant and M is the mass of the planet. In this case, since the planet and satellite have the same mass (m), we can rewrite the equation as
[tex]v^{2}[/tex] = (G * m) / r
Substituting the orbital radius (3r) for r
[tex]vx^{2}[/tex] = (G * m) / (3r)
Now, we can calculate the kinetic energy of satellite X (Kx)
Kx = (1/2) * m * [tex]vx^{2}[/tex]
= (1/2) * m * ((G * m) / (3r))
For satellite Y
The orbital radius of satellite Y is 4r, so the orbital velocity of satellite Y (vy) can be determined using the same equation
[tex]vy^{2}[/tex] = (G * m) / (4r)
Calculating the kinetic energy of satellite Y (Ky)
Ky = (1/2) * m * [tex]vy^{2}[/tex]
= (1/2) * m * ((G * m) / (4r))
Now, let's find the ratio Kx / Ky:
Kx / Ky = [(1/2) * m * ((G * m) / (3r))] / [(1/2) * m * ((G * m) / (4r))]
= [(G * m) / (3r)] / [(G * m) / (4r)]
= (4r / 3r)
= 4/3
Therefore, the ratio of the kinetic energies of satellite X to satellite Y is 4/3.
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what types of stars tend to be found along spiral arms in the milky way and other similar galaxies?
Stars that tend to be found along spiral arms in the Milky Way and other similar galaxies are typically young, massive, and hot stars.
These stars are classified as O and B type stars, and are characterized by their blue color and high luminosity. O and B type stars have short lifetimes of a few million years, compared to the billions of years for stars like our Sun, so they are typically found in areas of active star formation, such as spiral arms.
These areas are rich in gas and dust, which are the raw materials needed to form new stars. As these stars age, they may migrate away from the spiral arms, where the gas and dust is less dense and new star formation is less likely.
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what effect do even thin clouds of dust have on light passing through them?
Even thin clouds of dust can have a significant effect on light passing through them. This is because dust particles scatter the light, causing it to diffuse and spread out in different directions.
As a result, the light passing through the dust cloud appears dimmer and less clear than it would without the dust. This scattering effect is also responsible for the reddening of the sun and sky during sunsets and sunrises, as the longer wavelengths of light are scattered less by the dust, leaving predominantly shorter wavelengths (red, orange and yellow) to be seen. In addition to impacting visibility, dust particles in the air can also cause health problems for humans and animals if inhaled over long periods of time.
Thin clouds of dust can significantly affect light passing through them. They cause scattering, absorption, and attenuation of light. Scattering occurs when light particles are deflected in multiple directions due to interactions with dust particles. This can lead to reduced visibility and brightness. Absorption is when dust particles absorb light energy, transforming it into heat and reducing the intensity of light that continues to travel through the cloud. Attenuation is the combined effect of scattering and absorption, resulting in the overall weakening of light as it passes through the dust cloud. Consequently, even thin clouds of dust can impact light transmission and visibility.
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Two cellos are being played in a duet. At a certain point, one cello plays a note of frequency 148.0 Hz and the other plays a note of frequency 148.5 Hz. What is the period of the beat?
When two cellos are being played in a duet and at a certain point, one cello plays a note of frequency 148.0 Hz and the other plays a note of frequency 148.5 Hz then the period of the beat in this duet is 2 seconds.
When two notes of slightly different frequencies are played together, they produce a phenomenon called beat. This is a periodic variation in loudness that is caused by the interference of the two sound waves. The period of the beat is the time it takes for one complete cycle of the variation in loudness.
To find the period of the beat in this scenario, we need to calculate the difference between the frequencies of the two cellos. In this case, the difference is:
148.5 Hz - 148.0 Hz = 0.5 Hz
This means that the two cellos are playing slightly out of phase with each other, resulting in a beat frequency of 0.5 Hz. The period of the beat can be calculated by taking the inverse of the beat frequency:
Period of beat = 1 / 0.5 Hz = 2 seconds
So the period of the beat in this duet is 2 seconds. This means that the variation in loudness will repeat every 2 seconds as the two notes interfere with each other. It's important to note that the amplitude of the beat will depend on the intensity and duration of the notes being played.
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the paschen series is analogous to the balmer series, but with m=3.
The Paschen series is a spectral series of hydrogen-like atoms that is similar to the Balmer series, but with a different value of the principal quantum number.
Specifically, the Paschen series corresponds to transitions between an excited state with principal quantum number n greater than or equal to 3, and the n=3 energy level in hydrogen-like atoms.
Like the Balmer series, the Paschen series also produces a series of spectral lines, which are the result of the emission of electromagnetic radiation as the electrons in the atom transition from higher energy levels to lower energy levels.
However, the wavelengths of the spectral lines in the Paschen series are longer than those in the Balmer series, due to the higher energy levels involved.
Overall, the Paschen series is an important aspect of the study of atomic physics, and provides valuable insights into the behavior of hydrogen-like atoms and their spectral emissions.
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you have a process that has both work and heat interaction. can this process be a fully reversible process?
In order for a process to be fully reversible, it must be both internally and externally reversible. A process with work and heat interaction can only be internally reversible if it occurs under conditions of constant temperature and pressure.
However, in most real-world situations, temperature and pressure are not constant, making the process irreversible. Therefore, a process with work and heat interaction cannot be fully reversible. This is because heat transfer is inherently irreversible due to the second law of thermodynamics, which states that heat flows naturally from hot to cold objects, causing an increase in entropy. Thus, while a process with work and heat interaction can be internally reversible, it cannot be fully reversible.
Yes, a process with both work and heat interactions can be a fully reversible process. Reversible processes are those that can return to their initial state without any change in the surroundings. For a process to be fully reversible, the work and heat interactions must be done in infinitesimal steps with minimal dissipation. In a reversible process, the system remains in a series of equilibrium states, allowing it to return to its original state without any net effect on the system or surroundings. However, achieving a fully reversible process is only a theoretical concept, as in practice, there will always be some energy loss or irreversibility.
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certain mass-spring system oscillates with an amplitude of 5mm when the forcing frequency is 20 hz, and with an amplitude of 1mm when the forcing frequency is 40 hz. estimate the frequency of the system (remember: 1hz
To estimate the frequency of the mass-spring system, we can use the equation for the amplitude of forced oscillations:
A = (F0/m)/sqrt((w0^2-w^2)^2 + (b*w)^2)
where A is the amplitude of the oscillations, F0 is the amplitude of the external force, m is the mass of the system, w0 is the natural frequency of the system, w is the frequency of the external force, and b is the damping coefficient.
Using the given values, we can plug in the numbers for the two different frequencies and amplitudes:
For w = 20 Hz, A = 5 mm
For w = 40 Hz, A = 1 mm
Solving for w0, we get:
w0 = sqrt((F0/m)^2 + w^2 * sqrt((A^2 * b^2)/(F0^2/m^2 - A^2)))
By substituting the values for F0, m, b, A, and the two different frequencies, we can solve for w0 and estimate the natural frequency.
The estimated frequency of the mass-spring system is approximately 29 Hz.
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A cannonball following a parabolic path explodes into fragments. The momentum of the fragments.
I know the answer is:
continue along the path as if the explosion didn't occur.
But why, can you explain this?
When a cannonball explodes into fragments, the total momentum of the fragments is conserved.
This means that the sum of the momenta of all the fragments must be equal to the momentum of the original cannonball. The fragments will continue to move along the same parabolic path as the cannonball, but each fragment will have a different velocity and direction.
The explosion itself does not change the path of the fragments because the force that caused the explosion was internal to the cannonball and did not exert any external forces on the fragments. Therefore, the fragments will continue to follow the same trajectory that the cannonball was on before the explosion.
This principle is known as the law of conservation of momentum, which states that the total momentum of a closed system (in this case, the cannonball and its fragments) is conserved unless acted upon by an external force.
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compared to blue main sequence stars, red main sequence stars are compared to blue main sequence stars, red main sequence stars are hotter and brighter. hotter and dimmer. cooler and dimmer. cooler and brighter.
Overall, when comparing blue and red main sequence stars, it's important to consider their size, mass, and stage in their lifecycle. While blue stars may be hotter and brighter, red stars still have an important role to play in the universe as they are more numerous and can provide valuable insight into stellar evolution.
When comparing blue and red main sequence stars, there are some notable differences to consider. Firstly, it's important to note that main sequence stars are in the stage of their lives where they are fusing hydrogen in their cores.
In terms of temperature and brightness, red main sequence stars are cooler and dimmer than blue main sequence stars. This is due to the fact that red stars are smaller and less massive than blue stars. The smaller size of red stars means that they have less pressure in their cores, which results in a lower temperature and luminosity.
Conversely, blue main sequence stars are hotter and brighter due to their larger size and mass. Blue stars have more pressure in their cores, which leads to higher temperatures and brighter luminosities.
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a certain mass-spring system oscillates with an amplitude of 5mm when the forcing frequency is 20 hz, and with an amplitude of 1mm when the forcing frequency is 40 hz. estimate the frequency of the system (remember: 1hz
The estimated frequency of the mass-spring system is approximately 14.14 Hz.
To estimate the frequency of the mass-spring system, we can use the equation:
f = (1/2π) * sqrt(k/m)
where f is the frequency of the system, k is the spring constant, and m is the mass.
Given that the amplitude of oscillation changes from 5mm to 1mm as the forcing frequency changes from 20 Hz to 40 Hz, we can assume that the system is undergoing resonance at some frequency between these two values.
At resonance, the amplitude of oscillation is maximum, and the frequency of the system is equal to the forcing frequency. Therefore, we can estimate the frequency of the system by finding the frequency at which the amplitude is maximum.
Using the given values, we can set up two equations:
5mm = (1/2π) * sqrt(k/m) * 20 Hz
1mm = (1/2π) * sqrt(k/m) * 40 Hz
Simplifying these equations, we get:
sqrt(k/m) = (5mm * 2π) / (20 Hz)
sqrt(k/m) = (1mm * 2π) / (40 Hz)
Squaring both sides of these equations and eliminating k/m, we get:
(5mm * 2π)^2 / (20 Hz)^2 = (1mm * 2π)^2 / (40 Hz)^2
Solving for the unknown variable, we get:
f = (1/2π) * sqrt((5mm * 2π)^2 / (20 Hz)^2 + (1mm * 2π)^2 / (40 Hz)^2)
f = 14.14 Hz (long answer)
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what causes the sun to "bob" up-and-down in its orbit around the galactic center?
A) gravitational attraction towards other nearby galaxies
B) lack of friction with the low-density interstellar medium
C) the localized pull of stars within the disk itself
D) A and B
E) B and C
The localized pull of stars within the disk itself causes the sun to "bob" up-and-down in its orbit around the galactic center. The main answer is option C)
The sun, like other stars in the Milky Way galaxy, experiences a phenomenon known as vertical oscillation or "bobbing" as it orbits the galactic center.
This vertical motion is primarily caused by the localized gravitational pull of stars within the disk of the galaxy itself (option C). The gravitational interactions with nearby stars result in a periodic up-and-down motion of the sun's orbit.
Therefore, the correct answer is option C) the localized pull of stars within the disk itself.
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coherent light of wavelength 519 nm passes through two slits. in the resulting interference pattern on a screen 4.6 m away, adjacent bright fringes are 4.00 mm apart. what is the separation of the two slits?
If a coherent light of wavelength 519 nm passes through two slits, the separation of the two slits is approximately 0.0604 mm.
To calculate the separation of the two slits in a double-slit interference pattern, we can use the equation for the fringe separation:
d * sinθ = m * λ
Where:
d is the separation of the slits,
θ is the angle of the bright fringe,
m is the order of the fringe, and
λ is the wavelength of the light.
In this case:
λ = 519 nm = 519 × 10⁻⁹ m,
m = 1 (assuming we're considering the first-order bright fringe),
θ = tan⁻¹(y / L), where y is the fringe separation and L is the distance to the screen.
Given that adjacent bright fringes are 4.00 mm apart (y = 4.00 mm = 4.00 × 10⁻³ m) and the screen is 4.6 m away (L = 4.6 m), we can calculate the angle θ:
θ = tan⁻¹(y / L) = tan⁻¹(4.00 × 10⁻³ / 4.6) ≈ 0.00087 rad
Now, substituting the values into the equation, we can solve for the separation of the slits (d):
d * sin(0.00087) = (1) * (519 × 10⁻⁹)
d = (519 × 10⁻⁹) / sin(0.00087)
d ≈ 0.0604 mm
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Based on your measurements, what is the maximum height reached by the puck in trial 6
Based on the measurements, the maximum height reached by the puck in trial 6 is determined as 5.1 m.
What is the maximum height reached by the puck?The maximum height reached by the puck is calculated by applying the principle of conservation of energy as shown below;
From the trials, the puck was thrown upwards with initial velocity of 10 m/s and the mass of the puck is given as 400 g.
With these values we can predict the maximum height the puck will reach by applying the principle of conservation of energy.
Potential energy of the puck at maximum height = Kinetic energy of the puck at minimum height
P.E = K.E
mgh = ¹/₂ mv²
h = ¹/₂ (v² / g )
where;
v is the initial velocity of the puckg is acceleration due to gravityThe maximum height reached by the puck is calculated as follows;
h = ¹/₂ (10² / 9.8 )
h = 5.1 m
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14. how long after closing the switch does it take for the inductor to discharge 25% of its stored energy? a) 0.25 s b) 0.50 s c) 1.2 s d) 2.4 s
The time it takes for an inductor to discharge a certain percentage of its stored energy depends on its inductance and the resistance of the circuit.
In this case, we do not have the values of the inductance and resistance, so we cannot calculate the time precisely. However, we can use a formula that relates the time constant of the circuit (the product of the inductance and resistance) to the percentage of energy remaining in the inductor after a certain time. This formula is:
E(t) = E(0) * exp(-t/τ)
where E(t) is the energy remaining in the inductor after time t, E(0) is the initial energy stored in the inductor, τ is the time constant of the circuit (L/R), and exp is the exponential function.
If we want to find the time it takes for the inductor to discharge 25% of its stored energy, we can set E(t) = 0.25*E(0) and solve for t. This gives:
t = -τ * ln(0.25)
The natural logarithm of 0.25 is -1.39, so we can simplify the equation to:
t = 1.39 * τ
Since we do not have the values of L and R, we cannot calculate the time constant τ or the exact time it takes for the inductor to discharge 25% of its energy. However, we can see that the answer choices range from 0.25 s to 2.4 s, which suggests that the time constant and/or the resistance of the circuit are relatively small. If we assume a typical value for the time constant of an inductor circuit (e.g. τ = 0.1 s), we can estimate that the answer is likely to be around 0.14 s (i.e. 1.39 * 0.1). This is closest to answer (a) 0.25 s, but we cannot be certain without more information.
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nasa launches a satellite into orbit at a height above the surface of the earth equal to the earth's mean radius. the mass of the satellite is 430 kg. (assume the earth's mass is 5.97 1024 kg and its radius is 6.38 106 m.) (a) how long does it take the satellite to go around the earth once? h (b) what is the orbital speed of the satellite? m/s (c) how much gravitational force does the satellite experience? n
a. The orbital velocity of the satellite is approximately 29.78 m/s.
b. The orbital speed of the satellite is approximately 29.78 m/s.
c. The gravitational force experienced by the satellite is approximately [tex]1.995 * 10^{-9[/tex] N.
(a) To solve for the orbital period (T), we can use the equation:
T = 2 * π * r/v
where r is the radius of the orbit, v is the orbital velocity, and π is the mathematical constant pi (approximately 3.14159).
Given that the height of the satellite above the surface of the Earth is equal to the Earth's mean radius, we can substitute this value into the equation above:
T = 2 * π * (6.38 * [tex]10^6[/tex] m)/(v)
where v is the orbital velocity.
The orbital velocity can be calculated using the equation:
v = √(GM/r)
v = √[tex]\sqrt{(6.674 * 10^{-11} N m^2/kg^2 * 5.97 * 10^{24} kg / (6.38 * 10^6 m))}[/tex]
= 29.78 m/s
Therefore, the orbital velocity of the satellite is approximately 29.78 m/s.
(b) To solve for the orbital speed of the satellite, we can use the equation:
v = [tex]\sqrt{(GM/r)}[/tex]
the values for G, M, and r, we get:
v = [tex](6.674 * 10^{-11} N m^2/kg^2 * 5.97 * 10^{24} kg / (6.38 * 10^6 m))[/tex]
= 29.78 m/s
Therefore, the orbital speed of the satellite is approximately 29.78 m/s.
(c) To solve for the gravitational force experienced by the satellite, we can use the equation:
F = [tex]G * (M_s / r^2)[/tex]
Substituting the values for G, M_s, and r, we get:
F =[tex]6.674 * 10^{-11} N m^2/kg^2 * (430 kg / (6.38 * 10^6 m)^2)[/tex]
= [tex]1.995 * 10^{-9[/tex] N.
Therefore, the gravitational force experienced by the satellite is approximately [tex]1.995 * 10^{-9[/tex] N.
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Two 2.20 cm x 2.20 cm plates that form a parallel-plate capacitor are charged to +/- 0.708 nC.
a) What is the potential difference across the capacitor if the spacing between plates is 1.40 mm?
b) What is the electric field inside the capacitor if the spacing between plates is 2.80 mm?
c) What is the potential difference across the capacitor if the spacing between plates is 2.80 mm?
The parallel-plate capacitor has an area (A) of 2.20 cm x 2.20 cm, which equals 4.84 cm² or 4.84 x 10⁻⁴ m². The charge (Q) on the plates is +/- 0.708 nC, or 0.708 x 10⁻⁹ C.
a) To find the potential difference, we can use the equation V = Q/C, where Q is the charge and C is the capacitance. The capacitance of a parallel-plate capacitor is given by C = ε0A/d, where ε0 is the permittivity of free space, A is the area of each plate, and d is the distance between the plates. Plugging in the given values, we get C = (8.85x10^-12 F/m)(0.022m^2)/(0.0014m) = 3.43x10^-10 F. Thus, V = (0.708x10^-9 C)/(3.43x10^-10 F) = 2.06 V.
b) The electric field inside a parallel-plate capacitor is given by E = V/d, where V is the potential difference and d is the distance between the plates. Plugging in the given values, we get E = 2.06 V/0.0028 m = 736 V/m.
c) To find the potential difference with a spacing of 2.80 mm, we can use the same equation as in part (a), but with a different capacitance value. Plugging in the given values, we get C = (8.85x10^-12 F/m)(0.022m^2)/(0.0028m) = 6.92x10^-10 F. Thus, V = (0.708x10^-9 C)/(6.92x10^-10 F) = 10.2 V.
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Which object below would have the least amount of kinetic energy?
Question 4 options:
An airplane flying from New York to Los Angeles
A boulder at rest on a cliff
A snail crawling along a sidewalk
A honeybee flying back to its hive
A boulder at rest on a cliff would have the least amount of kinetic energy, as it is not in motion. The correct option is B.
Kinetic energy is the energy that an object possesses due to its motion. It is the energy that is required to accelerate a stationary object to its current speed. The kinetic energy of an object is dependent on its mass and velocity, with the formula for kinetic energy given by KE = 1/2mv^2, where KE is the kinetic energy, m is the mass of the object, and v is its velocity.
Option A, an airplane flying from New York to Los Angeles, would have a significant amount of kinetic energy due to its high velocity and mass.
Option C, a snail crawling along a sidewalk, would have a small amount of kinetic energy due to its slow speed and small mass.
Option D, a honeybee flying back to its hive, would have a moderate amount of kinetic energy due to its relatively high speed and small mass.
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a criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 5.3 m/sec, hoping to land on the roof of an adjacent building. the horizontal distance between the two buildings is d, and the roof the adjacent building is 2.0 m below the jumping-off point. find the maximum value of d.
A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 5.3 m/sec, hoping to land on the roof of an adjacent building. The maximum horizontal distance that the criminal can jump is approximately 1.077 meters.
We can use the equations of motion to solve this problem. Let's assume that the criminal jumps off the roof at time t=0.
In the horizontal direction, there is no acceleration, so the distance traveled is given by
d = vx*t
Where vx is the horizontal velocity (5.3 m/s) and t is the time of flight.
In the vertical direction, we can use the equation
y = y0 + vyt + 1/2a*[tex]t^{2}[/tex]
Where y is the vertical displacement (negative because the roof of the adjacent building is below the jumping-off point), y0 is the initial height (0 m), vy is the vertical velocity (0 m/s), a is the acceleration due to gravity (-9.8 m/[tex]s^{2}[/tex]), and t is the time of flight.
We can solve for t by setting y equal to -2.0 m
-2.0 m = 0 + 0t - 1/29.8*[tex]t^{2}[/tex]
Solving for t, we get
t = [tex]\sqrt{0.4/4.9}[/tex] = 0.203 s
Now we can substitute this value of t into the equation for d
d = 5.3 m/s * 0.203 s = 1.077 m
Therefore, the maximum horizontal distance that the criminal can jump is approximately 1.077 meters.
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across a
+ Calculate the potential difference
resistor of resistance 2 kr that allows a
Current IMA to pass through
The potential difference between the ends of the resistor is 40 volts.
How to calculate the potential differenceThe potential difference (voltage) between the ends of a resistor can be calculated using Ohm's law, which states that V = IR, where V is the voltage, I is the current, and R is the resistance.
In this case, the resistance is 20 ohms and the current is 2 amperes. Hence, applying Ohm's law we get:
V = IR = 2 A * 20 Ω = 40 V
Therefore, the potential difference between the ends of the resistor is 40 volts.
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A resistance of 20ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends ?
crystal clear, crystal yellow, and crystal orange are driven by which factors?
The appearance of crystal clear, crystal yellow, and crystal orange can be influenced by a wide range of factors, and each crystal or gemstone is unique in terms of its specific coloration and underlying properties.
Crystal clear, crystal yellow, and crystal orange are all colors that can be found in various natural crystals and gemstones. The factors that drive the appearance of these colors can vary depending on the specific crystal or gemstone.
In general, the color of a crystal or gemstone is determined by the presence of trace elements or impurities within the crystal lattice structure. For example, the vibrant yellow color in citrine crystals is caused by the presence of iron impurities, while orange sapphire can get its color from the presence of titanium and iron.
Other factors that can affect the color of a crystal or gemstone include the lighting conditions, the angle at which the crystal is viewed, and any treatments or enhancements that have been applied to the stone.
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a 210v battery has two resistors. r1 and r2 are connected in series. r1 is 13k ohms with a voltage drop of 200v. what is the value of r2?
The value of R2 is approximately 651.55 ohms. When two resistors are connected in series, the tota
across them is divided between the resistors in proportion to their resistance values.
So, we can use the following formula to find the value of R2:
V2 = Vtotal - V1
where V2 is the voltage drop across R2, Vtotal is the total voltage of the battery (210 V), and V1 is the voltage drop across R1 (200 V).
Since R1 and R2 are connected in series, the current passing through them is the same. We can use Ohm's Law to relate the current, voltage, and resistance:
I = V/R
where I is the current passing through the resistors, V is the voltage drop across the resistor, and R is the resistance of the resistor.
Since R1 is 13 kohms and has a voltage drop of 200 V, the current passing through it is:
I = V/R = 200/13000 = 0.01538 A
This same current also passes through R2.
Now we can use Ohm's Law again to find the value of R2:
R2 = V2/I
Substituting the values we have:
V2 = Vtotal - V1 = 210 - 200 = 10 V
R2 = V2/I = 10/0.01538 = 651.55 ohms
Therefore, the value of R2 is approximately 651.55 ohms.
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a guitar string with length l and mass m is under tension between its ends with magnitude t and transmits mechanical waves when plucked with speed v. another string with the same length l, but mass 3m is under tension between its ends with magnitude 2t. what is the wave speed in the second string?
The wave speed in the second string is the same as in the first string because the tension and length are the same.
The wave speed in a string is determined by the tension and mass per unit length. In this case, the first string has a tension of t and a mass per unit length of m/l. The second string has a tension of 2t and a mass per unit length of 3m/l.
However, both strings have the same length l, so the only difference in their wave speeds comes from their mass per unit length. Since the mass per unit length is three times higher in the second string, it cancels out the effect of the higher tension. Therefore, the wave speed in the second string is the same as in the first string, which is v.
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An LRC ac circuit has a reactance (due to its capacitance) of 17 kΩ, a reactance (due to its
inductance) of 9.0 kΩ, and a resistance of 28 kΩ. What is the power factor of the circuit?
A) 0.96
B) 0.28
C) 1.04
D) 0.48
To calculate the power factor of the LRC circuit, we need to determine the ratio of the resistance to the impedance. The correct option is A) 0.96.
The impedance of the circuit (Z) is given by the formula [tex]Z = \sqrt{(R^2 + (Xl - Xc)^2)[/tex], where R is the resistance, Xl is the reactance due to inductance, and Xc is the reactance due to capacitance.
Substituting these values into the formula, we have[tex]Z = \sqrt{((28 k \Omega)^2 + (9.0 k \Omega - 17 k \Omega)^2).[/tex]
Once we have the impedance, we can calculate the power factor (PF) by taking the ratio of the resistance to the impedance: [tex]PF = R / Z[/tex].
To evaluate the expression for the power factor, we first need to calculate the impedance (Z) using the given values:
[tex]Z = \sqrt{((28 k\Omega)^2 + (9.0 k\Omega - 17 k\Omega)^2)[/tex]
Simplifying the expression within the square root:
[tex]Z = \sqrt{((784 k\Omega^2) + (64 k\Omega^2))\\Z = 29.14 k\Omega[/tex]
Next, we can calculate the power factor (PF) by dividing the resistance (R) by the impedance (Z):
[tex]PF = R / Z\\ = 28 k\Omega / 29.14 k\Omega\\PF = 0.96[/tex]
Therefore, the power factor of the LRC circuit is approximately 0.96. Comparing this result to the answer choices, we can see that the correct option is A) 0.96.
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which of the four terrestrial planets has or have a global (planetwide) magnetic field?
Two bowlers accidentally roll their bowling balls down the same lane, and
the two balls collide with one another. The bowling balls are moving with
equal speeds and their speeds are the same before and after the collision.
During the collision, is momentum conserved in the two-bowling ball
system?
Choose 1 answer:
A Yes; no external net force is applied during the collision.
B
No; an external net force is applied during the collision.
Yes; kinetic energy is not conserved during the collision.
No; kinetic energy is conserved during the collision.
During the collision, A. Yes; no external net force is applied during the collision.
How to determine momentum conservation?In the given scenario, the two bowling balls collide with each other. If no external net force is applied during the collision, then momentum is conserved in the two-ball system.
The conservation of momentum means that the total momentum before the collision is equal to the total momentum after the collision. Kinetic energy, on the other hand, may not be conserved during the collision.
Therefore, the correct answer is:
A. Yes; no external net force is applied during the collision.
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ranking task: gravitational force, orbital periods, and doppler shifts for extrasolar planets
When it comes to ranking extrasolar planets, there are a few key factors to consider. The first is gravitational force, which is determined by the mass and distance of the planet from its star. Planets with higher masses and closer distances to their stars will typically have stronger gravitational forces.
The second factor to consider is orbital period, which is the amount of time it takes for a planet to complete one orbit around its star. This is determined by the distance between the planet and its star, as well as the planet's mass and velocity. Planets with longer orbital periods will typically be farther from their stars and have lower masses.
Finally, Doppler shifts can also be used to rank extrasolar planets. These shifts occur when a planet's gravitational pull causes its star to wobble slightly, resulting in small shifts in the star's spectral lines. Planets with larger masses and closer distances to their stars will typically cause larger Doppler shifts.
Overall, it's important to consider all of these factors when ranking extrasolar planets. While gravitational force and orbital period are more straightforward measures, Doppler shifts can provide additional insights into the characteristics of these distant worlds.
The ranking task for extrasolar planets involves comparing gravitational force, orbital periods, and Doppler shifts. Gravitational force is the force that attracts two bodies with mass towards each other, and it depends on their masses and the distance between them. Planets with higher masses exert a stronger gravitational force on their host stars.
Orbital periods refer to the time it takes for a planet to complete one orbit around its star. Planets closer to their host star have shorter orbital periods, while those farther away have longer periods.
Doppler shifts occur when a star's light spectrum shifts due to the movement of the star towards or away from us, caused by the gravitational pull of orbiting planets. A larger Doppler shift indicates a stronger gravitational force exerted by the planet.
In ranking these factors, planets with stronger gravitational forces will cause larger Doppler shifts and have shorter orbital periods. As a result, massive planets close to their host star will rank higher in these aspects, while less massive planets farther away will rank lower.
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A person is pushing a box across a table. The measured forces on the box are 10N, 14N, -7N, -10N.
Which force is represented by -7N?
force of friction
normal force
force of gravity
push force
The force represented by -7N is the force of friction. So, the correct answer is force of friction (Option A).
Friction is a force that opposes the motion of an object when it is in contact with a surface. In this scenario, the person is pushing the box across a table, which means the box is in contact with the surface of the table. As a result, there will be a force of friction acting on the box in the opposite direction to the push force applied by the person.
The normal force is the force that a surface exerts on an object in contact with it, perpendicular to the surface. In this case, the normal force is equal to the weight of the box, which is balanced by the force of gravity pulling the box downwards.
The force of gravity is the force that pulls an object towards the center of the earth. It is proportional to the mass of the object and the acceleration due to gravity. In this case, the force of gravity is acting on the box, but it is not one of the measured forces on the box.
Finally, the push force is the force that the person is applying to the box to move it across the table. This force is measured as 10N and 14N in this scenario.
Therefore, the force represented by -7N is the force of friction. It is acting in the opposite direction to the push force and is causing the box to slow down or resist the motion.
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Suppose you are standing on the frictionless ice of a frozen pond. How can you move off the ice?
A- move arms back and forth
B- crawl
C- throw something
D- push with both feet at the same time
Answer: C
Explanation:
Conservation of momentum states that initial and final momentum must be conserved. If an object is thrown, its momentum will become non-zero, and thus to conserve momentum your momentum and thus your velocity will also become non-zero. Due to there being no friction, you will glide across the ice at a constant velocity until you eventually reach the edge of the pond, at which point you can get off of the ice.
like a microscope, a simple telescope works by having one positive lens use the image from the other positive lens as its object. however, in a telescope, the final image is not larger but closer to the eye. this allows for our eye to see it in more detail since we have produced a(n)
The statement is incomplete and incorrect. A simple telescope does work by using two lenses - an objective lens and an eyepiece. The objective lens forms a real and inverted image of the distant object at its focal point.
The eyepiece is then used to magnify this image and bring it closer to the eye.
However, the final image produced by the telescope is not necessarily closer to the eye but rather larger in size. This larger image is what allows the eye to see more details and magnification. Therefore, the statement should be revised as: "Like a microscope, a simple telescope works by having one positive lens use the image from the other positive lens as its object. However, in a telescope, the final image is not closer but rather larger in size. This allows for the eye to see the image in more detail, providing magnification."
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Two radio antennas are separated by 2.40 m . Both broadcast identical 750 MHz waves.
If you walk around the antennas in a circle of radius 20.0 m, how many maxima will you detect?
There are seven maxima detected as you walk around the antennas in a circle of radius 20.0 m.
The maxima or constructive interference occur when the path difference between the waves from the two antennas is an integer multiple of the wavelength. The wavelength of a 750 MHz wave is:
λ = c/f = (3.00 x 10^8 m/s) / (750 x 10^6 Hz) = 0.4 m
where c is the speed of light.
The path difference between the waves from the two antennas for a point on the circle at an angle θ relative to the line connecting the antennas is:
d = 2.4 m sin θ
The number of maxima is given by the number of values of θ that make d an integer multiple of the wavelength:
d = mλ, where m = 0, 1, 2, ...
2.4 m sin θ = mλ
sin θ = mλ / 2.4 m = mλ' , where λ' = λ / 2.4
θ = sin^(-1)(mλ' / 20.0 m), where m = 0, 1, 2, ...
For m = 0, we have sin θ = 0, so θ = 0.
For m = 1, we have sin θ = λ' / 20.0, so θ = 14.5 degrees.
For m = 2, we have sin θ = 2λ' / 20.0, so θ = 29.0 degrees.
For m = 3, we have sin θ = 3λ' / 20.0, so θ = 43.4 degrees.
For m = 4, we have sin θ = 4λ' / 20.0, so θ = 57.7 degrees.
For m = 5, we have sin θ = 5λ' / 20.0, so θ = 72.0 degrees.
For m = 6, we have sin θ = 6λ' / 20.0, so θ = 86.3 degrees.
We continue in this way until sin θ > 1, which means that there are no more maxima.
Therefore, there are seven maxima detected as you walk around the antennas in a circle of radius 20.0 m.
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The primary coil of a transformer has 220 turns and its secondary coil has 440 turns, round all answers to two decimal places as need. If the ac voltage applied to the primary coil is 160 v what voltage is present in its secondary coil?
Therefore, if the primary coil has 220 turns and the secondary coil has 440 turns, the ratio of the number of turns is 1:2. This means that the voltage in the secondary coil will be double that of the voltage in the primary coil.
According to the transformer equation, the ratio of the number of turns in the primary coil to the number of turns in the secondary coil is equal to the ratio of the voltage in the primary coil to the voltage in the secondary coil. So, if the ac voltage applied to the primary coil is 160 V, the voltage in the secondary coil will be 320 V (160 V x 2). It's important to note that this calculation assumes ideal transformer behavior, and there may be losses due to resistance and other factors in real-world applications.
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