A neutron star is as dense as The Nucleus of an Atom . Option C is correct.
What is a neutron star?The collapsing core of a large supergiant star with a total mass of between 10 and 25 solar masses—possibly even more if the star was very metal-rich—is what we refer to as a neutron star. Neutron stars are the tiniest and densest class of stellar objects currently known, with the exception of black holes and other hypothetical phenomena.
When a big star runs out of fuel and collapses, neutron stars are created. The core of the star, which is its most central portion, collapses, fusing every proton and electron into a neutron.
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a physical pendulum consists of a meter stick that is pivoted at a small hole drilled through the stick a distance x from the 50 cm mark. the period of oscillation is observed to be 3.1 s. find the distance x.
When physical pendulum is selected, the plus sign results in an improbable value for d(d=1.5>L). A physically significant result is obtained if we use the minus sign: d=0.056m.
What real-world instances exist of pendulums?A baseball club swinging back and forward on is an illustration of a physical pendulum. A physical pendulum can undergo simple harmonic motion in exactly the same manner that a simple pendulum can under specific circumstances.
What are physical and compound pendulums?The only physical aspect of a basic pendulum that influences its period has been its length. The object's mass has no bearing on the era. The period of a compound pendulum depends on both the mass of the object and whether that mass is distributed.
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study the spectral types listed in appendix f for the 20 brightest stars and for the stars within 12 light-years of earth. why do you think the two lists are so different? explain.
The points about the stars from the appendix are: Sirius A is the most luminous star within 12 parsecs. It is also the brightest star in our sky, even though it is not the closest. The list of the brightest stars will include the very luminous hot stars from distances greater than 12 light-years, while the list of the fainter yet closer low-mass stars will not.
The list of stars within 12 light-years is volume-limited, which means that almost all of the stars within that distance are listed regardless of luminosity. Such a list is a better representative of the total population of stars and is more plausible to be dominated by low-mass stars. The list of brightest stars includes only those stars that are above a certain apparent brightness threshold.
Therefore, the faintest nearby stars are excluded, but the brightest and rarer hot stars are included in higher proportion than they are in a volume-limited list.
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a wooden block rests on a ramp inclined at 30 degrees with the horizontal. how does the magnitude of the normal force on the block change if you increase the ramp to an incline of 45 degrees?
Assuming there aren't any frictional forces at play.
The block is simply being acted upon by its weight and the normal force.The weight can be represented graphically as a straight-down vector or as two parallel components with the slope's surface (axis of motion) and one component perpendicular to the slope's surface (opposite to the normal force).
How can the normal force be determined on a horizontal surface?When an item is supported exclusively by weight and normal forces, W = Fn, hence Fn = mg, for a horizontal surface. The normal force for an item across an inclined surface with an angle of is given by Fn=mgcos F n = m g c o s.
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Patient autonomy and free choice are morally correct. O Subjective Relativism O Moral Reasoning O Social Contract Ethics O Rule Utilitarianism
The Correct option is A. Patient autonomy and free choice are morally correct Subjective Relativism.
"Subjectivism" insists that the sole source of expertise or authority is inside the belief of the individual. "Subjective relativism," then, as a philosophical position, broadcasts that everyone is his personal authority on ethical lifestyles, and the source of his very own moral standards.
A superficially popular approach to ethics in America today is called "subjective relativism"; as it occurs, it violates each of those commitments, and has the impact (commonly supposed) of creating ethics not possible. To make the commitments clearer, it is able to be profitable examining the errors of this easy dogma.
"Relativism" denotes any technique to ethics that holds that there are no absolute or unchanging ethical principles, but that the regulations that govern every scenario are to be determined by way of their relation to something else: the customs or culture of the u. s ., for example, or the dreams of the contributors. "Subjectivism" insists that the sole source of knowledge or authority is within the notion of the man or woman. '
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this problem occurs in petroleum firefighting when fire streams are applied to the burning liquid surface at such an angle that hot and / or burning oil is forced over the edge of the tank. the oil then flows down the side of the tank and you are now confronted with a fire on the ground as well as the one in the tank. this best defines which problem?
Petroleum has less density than water. So, when fire streams are applied to the burning liquid surface at such an angle that hot and / or burning oil is forced over the edge of the tank, the oil then flows down the side of the tank and you are now confronted with a fire on the ground as well as the one in the tank.
What are the reasons not to use fire streams during deal with burning oil?When you spray water on a regular fire, you're attempting to lower the flame's temperature and contain the fire.
Fuel for an oil fire is oil. Temperature and oxidizer are present in a fire (oxygen). Due to the fact that oil is lighter than water, an explosion may result if it floats above water while water sinks beneath oil.
Consequently, water shouldn't be used to put out oil fires.
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acceleration is generally defined as the time rate of change of velocity. when can it be defined as the time rate of change of speed? group of answer choices when moving in a straight line, the time rate of change of speed is called velocity. when moving in a circle, the time rate of change of speed is always zero. when moving in a circle, the time rate of change of speed is called average speed. when moving in a straight line, the time rate of change of speed is acceleration.
When we are moving in a straight line, velocity the time rate of change of speed is acceleration.
Velocity can be described as a vector measurement of the charge and path of motion. Placed truly, speed is the velocity at which something moves in one course. The velocity of an automobile travelling north on a chief parkway and the velocity of a rocket launching into the area can each be measured using speed.
The distinctive styles of velocities are uniform speed, variable velocity, common pace and immediate pace. Uniform velocity: when a body is stated to be shifting with uniform speed if its average pace among any two factors along its course is equal in importance as well as path.
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If a conductor is connected to "ground", then what is the charge on it?
positive
neutral
negative
determined by other nearby charges
If the conductor is connected to the ground, then it has a neutral charge.
Earth acts as a zero potential ground. So when you connect a positively charged conductor to the ground, the positive charge flows into the ground, resulting in the flow of electrons from the ground to the conductor. A ground wire acts as protection against unstable currents.
Under normal circuit conditions, no current flows through the ground wire. However, when an electrical accident such as a short circuit occurs, the ground wire removes the unstable current from the electrical system and leads it to the ground. The ground wire can be finger-safe as long as there is no electrical surge that causes current to flow through the ground wire.
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three children are riding on the edge of a merry-go-round that is 115 kg, has a 1.7-m radius, and is spinning at 24 rpm. the children have masses of 32, 34, and 40 kg. (a) if the children with masses of 34 and 40 kg move to the center of the merry-go-round, what is the new angular velocity in rpm?
The new angular velocity is 27.7 rpm
From the question, we have
ω = 22 rpm = angular velocity with all children on the edge,
ω' = angular velocity after m2 moved.
From conservation of angular momentum, we have
Mr²ω'/2 + m1r²ω' + m3r²ω' = Mr²ω/2 + m1r²ω + m2r²ω + m3r²ω
ω' = ω(M/2 + m1 + m2 + m3)/(M/2 + m1 + m3)
ω' = 22×(115/2 + 32 + 34 + 40)/(115/2 + 32 + 40)
= 27.7 rpm
The new angular velocity is 27.7 rpm
Complete question:
three children are riding on the edge of a merry-go-round that is 115 kg, has a 1.7-m radius, and is spinning at 24 rpm. the children have masses of 32, 34, and 40 kg. (a) if the children with masses of 34 and 40 kg move to the center of the merry-go-round, what is the new angular velocity in rpm?
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you are experimenting with a stretched spring with your lab partner. you have a spring length of 3.05 meters, and you find that the vibration period of the 2nd harmonic is 0.370 s. what is the vibration frequency in hz? in radians per second? what is the wavelength of this vibration? what is the product of the frequency, in hz, and the wavelength?
The vibration frequency in Hz is 2.7 Hz. This is calculated by taking the inverse of the vibration period (1/0.370 s = 2.7 Hz).
The vibration frequency in radians per second is 17.1 rad/s. This is calculated by taking the vibration frequency in Hz (2.7 Hz) and multiplying it by 2π (2.7 Hz x 2π = 17.1 rad/s).
The wavelength of this vibration is 1.13 m. This is calculated by taking the length of the spring (3.05 m) and dividing it by the harmonic number (3.05 m/2 = 1.13 m).
The product of the frequency, in Hz, and the wavelength is 3.06 Hz-m. This is calculated by taking the frequency in Hz (2.7 Hz) and the wavelength (1.13 m) and multiplying them together (2.7 Hz x 1.13 m = 3.06 Hz-m).
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A rifle is aimed horizontally at a target 45 m m away. The bullet hits the target 2.1 cm below the aim point.
What was the bullet’s flight time? (assume air resistance is 0)
What was the bullet’s speed as soon as it leaves the barrel?
The bullet's flight time with zero air resistance is 0.065s and the bullet speed as soon as it leaves the barrel is 692.3m/s.
How to calculate flight time and speed?To calculate flight time of the bullet we apply the formula [tex]h = \frac{1}{2} gt^{2}[/tex]
Where h = vertical displacement of bullet in meters, 2.1cm to 0.021m
g = is a gravitational constant of 9.8
t = time of flight in seconds
To find t =
[tex]t = \sqrt{\frac{2h}{g} }[/tex]
[tex]t = \sqrt{\frac{2 * 0.021}{9.8} }[/tex] = [tex]t = \sqrt{\frac{0.042}{9.8} }[/tex]
[tex]t = \sqrt{0.004286}[/tex]
t = 0.065s
For speed of bullet:
[tex]v = \frac{s}{t}[/tex]
Where v = velocity
s = horizontal distance/range of target, 45m
t = flight time in seconds, 0.065s
[tex]v = \frac{45}{0.065}[/tex]
v = 692.3m/s
The bullet's flight time on a horizontal target at 45m from the formula [tex]h = \frac{1}{2} gt^{2}[/tex] is 0.065s and using the time of flight to divide the range, the bullet leaves the barrel at a speed of 692.3m/s
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Cedric is riding the free fall ride at six flags . If Cedric free falls from rest for 2.6 seconds . What will his final velocity be
The final velocity of the free fall was 2.6(a)
define acceleration ?
The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. It is a vector quantity to accelerate (in that they have magnitude and direction). The direction of the net force applied on an item determines the direction of its acceleration. According to Newton's Second Law, the amount of an object's acceleration is the combined result of two causes:
According to the materials used to make the item, the magnitude of the net balance of all external forces acting on it is inversely proportional to its mass, but the size of the net resultant force is directly proportional to the net force.
The acceleration unit in the SI is the metre per second squared.
the final velocity was
f=u + a t
f=0+ a(2.6)
=a(2.6)
the acceleration of the free fall ride was not mentioned in the question so upto the question detailing the final velocity was found to be 2.6(a)
here the mentioned a was called as the acceleration.
The final velocity of the free fall was 2.6(a)
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a force of 15n is used to push a box along the floor distance of 3 meters. find the amount of work done
Answer:
to find the amount of work done, you need to calculate the force applied to the box times the distance over which it is applied. In this case, the force applied to the box is 15N and the distance over which it is applied is 3 meters, so the amount of work done is 15N * 3m = 45N*m.
Explanation:
It's important to note that work is a scalar quantity, not a vector quantity. This means that it has only magnitude and no direction. The direction of the force applied to the box and the direction of the displacement of the box are not relevant in calculating the amount of work done.
Important Formulas:
[tex]w=Fd[/tex]
work(measured in joules) = force(measured in newtons) * distance(measured in meters)
__________________________________________________________
Given:
[tex]F=15N[/tex]
[tex]d=3m[/tex]
[tex]w=?[/tex]
__________________________________________________________
Finding work:
[tex]w=Fd[/tex]
[tex]w=15\times3[/tex]
__________________________________________________________
[tex]\fbox{w = 45J}[/tex]
if 8.0 mg of a radioactive substance naturally decays to 0.50 mg over 184 days, what is the half-life of the radioisotope?
According to the given statement 46 days is the half-life of the radioisotope.
What is radioisotopes used for?An unstable chemical element that releases radiation as it breaks down and becomes increasingly stable. Both the natural environment and a laboratory can produce radioisotopes. They are used in medical imaging research and therapy.
Briefing:A radioactive substance's half life can be predicted by:
Nt = No(1/2)^(t/th)
Nt is the amount remaining (mg)
No is the initial amount (mg)
t is the time elapsed, in days
th is the half life in days.
Nt = No(1/2)^(t/th)
0.50mg = (8.0mg)(1/2)^(184 days/th)
We can resolve this for Th using logs.
th = 46 days
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a centrifuge in a medical laboratory rotates at an angu- lar velocity of 3 600 rev/min. when switched off, it rotates through 50.0 revolutions before coming to rest. find the con- stant angular acceleration (in rad/s2) of the centrifuge.
the con- stant angular acceleration (in rad/s2) of the centrifuge is α = -226.2rad/s².
Calculation :
We know that ,
W² = W₀ + 2αΔФ , W = 0 so
α = -W₀²/2ΔФ = -[tex](\frac{2\pi *3600}{60} )^{2} *\frac{1}{2*2\pi *50.0}[/tex]
= -72.0π
α = -226.2rad/s²
Angular acceleration refers to the rate of change of angular velocity over time. Since there are two types of angular velocity, spin angular velocity and orbital angular velocity, there are of course two types of angular acceleration, spin angular acceleration and orbital angular acceleration. Spin angular acceleration refers to the angular acceleration around the center of rotation of a rigid body, while orbital angular acceleration refers to the angular acceleration of a point particle about a fixed origin.
Angular acceleration is measured in angular units per unit time squared (radians per second squared in SI units) and is usually represented by the symbol alpha (α).
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which three astrophysical objects have been very historically important as standard candles? group of answer choices supernova remnants type ia supernovae quasars wn type luminous blue variables rr lyrae variables cepheid variables red giant stars type ii supernovae
Cepheid Variable stars and RR Lyrae stars are the most often used standard candles in astronomy. The absolute magnitude of the star can be calculated from its variable period in both circumstances.
The international candle is used to measure the intensity of a light source. It was initially defined as a one-sixth-pound sperm wax candle burning at 120 grains per second. Astronomers use it today to determine the brightness of objects in the night sky.
A standard candle is a known object that does not need to be measured. A candle is a light source that emits a visible beam of light to the human eye. A standard candle is a type of astronomical objects, such as a supernova or a variable star, that has a recognized luminosity due to some characteristic property of the material it is formed of.
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hyrum is at a concert when a flute player hits a very high note at the end of a song. which of the following best explains why the pitch of the note sounds so high? responses it has a long wavelength and high frequency. it has a long wavelength and high frequency. it has a short wavelength and high frequency. it has a short wavelength and high frequency. it has a long wavelength and low frequency. it has a long wavelength and low frequency. it has a large amplitude. it has a large amplitude. it has a small amplitude.
Its high frequency and brief wavelength The best explanation for why the note's pitch seems so high is what follows.
Which theory best explains why different people respond to the same stimuli differently?concept of signal detection. some people react differently to the same stimulus is explained by the signal detection theory. The experience, expectations, motivation, and alertness of an individual are a few variables that explain these variations.
What produces high or low sound?Pitch. Depending on how quickly an object vibrates, a different sound is produced. High-pitched sounds are produced when something vibrates quickly. Things that vibrate more slowly produce low-pitched sounds.
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the superposition of mechanical waves can be observed in the movement of waves in a ripple tank
A.) Bumper Cars B.) waves in a ripple tank C.)electromagnetic radiation D.)an orchestra . Therefore all of the above.
What does mechanical wave superposition entail?According to the principle of superposition for mechanical waves, the position of the medium's mass element at a place where two or more moving waves join is equal to the algebraic total of the positions originating from the individual waves.
When is a wave superposition possible?When two (or more) waves are traveling through the same medium simultaneously, the principle of superposition can be applied to them. Without causing any disturbance, the waves pass through one another.
What prerequisites must be met for two waves to superimpose?They overlap and produce a phenomenon called wave interference.
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The given question is incomplete, the complete question is:
The superposition of mechanical waves can be observed in the movement of :
A. Bumper Cars
B. waves in a ripple tank.
C. electromagnetic radiation
D. an orchestra
You hold a picture motionless against a wall by pressing on it, as shown in the figure. (Figure 1) Figure 1 of 1The figure shows a hand, holding a picture by pressing it against the vertical wall. Part A Identify all forces acting on the object and draw the free-body diagram.
The number of forces acting on the picture was normal force , gravitational force, weight of the picture, force exerted by the hand.
define gravitational force ?
Have you ever wondered how planets orbit the Sun? Shouldn't the Earth and the Moon merely crash since the Earth draws the Moon and the Moon attracted the Earth? Why isn't the Moon falling? Why does it continue to revolve around the Earth?
Understanding the basics of gravity can provide answers to all of these problems. The gravitational force is the global force of attraction that acts between things. It is one among the universe's basic forces.
normal force , gravitational force, weight of the picture, force exerted by the hand.
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Answer: me personally I think its figure 4
:D
sven has also reached the finals of a strength competition and has to pull a city bus as far as he can. one end of a rope is attached to the bus, while the other end is tied around sven's waist. the rope is perfectly horizontal during the pull. during his pull, sven transfers 5000 joules of energy to the bus in the form of work. while sven is pulling, a rolling friction force of 1920 n also acts on the bus over a distance of 2.19 meters. if the bus started at rest, what is the bus' kinetic energy (in joules) at the moment before sven stops pulling?
The bus' kinetic energy (in joules) at the moment before sven stops pulling is 1195.2 Joules.
The energy associated with an object’s state of motion is Kinetic energy is a scalar quantity that is never negative in value and formula is K.E = 1/2mv^2.
The kinetic energy for the x, y, and z components are additive, Kinetic energy is relative to the motion of observer’s reference frame, since speed and velocity are as well.
An object’s kinetic energy depends more on its speed than its mass. Any change in an object’s speed will affect a change in its kinetic energy.
Given,
Frictional force (f) = 1920 N
Distance Cover (x) = 2·19 m
Then energy loss due to frictional force = fx
= 1920 × 2.19
= 4204.8 J
Energy apply by Sven is 5400 J
Rest of the energy. Kinetic is used to increase the kinetic energy of bus. So kinetic energy of the bus = 5400-4204.8
= 1195.2 J
When sven stops pullin, bus's kinetic energy is = 1195.2 J
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Which of the following represents the correct relationship between frequency and angular frequency?
a) ω=2πf b) ω=πf c) f=2πω d) f=πω
The suitable formula for the relationship between frequency and angular frequency is f=2r. A recurring event's frequency is measured by how many times it occurs in a unit of time.
What pitch does the universe have?
You may connect with the cosmos through this music's 432 Hz frequency and experience the power of the creative source. We use the 432 Hz frequency to help the unconscious become aware of how we shape our world.
What frequency causes harm to people?
The only known negative health consequences of RF field exposures in the frequency range from 3 kHz to 300 GHz relate to the occurrence of tissue heating and nerve stimulation (NS) from brief (acute) exposures, despite the advent of several further research papers on RF fields and health.
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the daily tidal range is of the least magnitude during ________.
Due to the Earth's rotation, the seas' neap tides alter every six hours or so. The Moon and the Sun's gravitational pull on the ocean's water produces the tides themselves.
What usually happens when waves approach shallow water?Waves from deep water become breaking waves when they enter the shallow water. The water particles drag along the bottom and flatten their orbit when the wave energy contacts the ocean floor (Fig. 4.18 B). When the water depth is less than half the wavelength (D 1/2 L), transitional waves are produced.
When waves enter shallow water, they frequently try to align themselves parallel to the shore.A wave's energy release when it approaches a beach or coastline creates a current that travels parallel to the shoreline. A "longshore current" is the name given to this kind of current.
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an 85.0-kg person steps into a car of mass 2400 kg, causing it to sink 2.35 cm on its springs. if started into vertical oscillation, and assuming no damping, at what frequency will the car and passenger vibrate on these springs?
An 85.0-kg person steps into a car of mass 2400 kg, causing it to sink 2.35 cm on its springs. if started into vertical oscillation, and assuming no damping, 0.60 Hz frequency will the car and passenger vibrate on these springs.
What is frequency?The quantity of waves that pass a set location in a predetermined period of time is known as frequency. As a result, if a wave travels for 1/2 second, the frequency is 2 per second. 100 times per hour is the frequency if it takes 1/100 of an hour.
Given that,
mass (m) = 85 kg
car of mass = 2400 kg
As we know,
m × g = kx
or, 85.0 × 9.8 = k × 2.35 × 10⁻²
or, k = (85.0 × 9.8 ) / (2.35 × 10⁻²)
or, k = 35,447 N/m
frequency (f) = 1 / 2 π [tex]\sqrt{k/m}[/tex]
or, f = [1 / 2π ] [tex]\sqrt{35447/(2400+85)}[/tex]
or, f = 0.60 Hz
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consider the properties you can deduce from the periodic table. what do you know about the noble gases? select all of models that represent noble gases.responses
Because of their electrical configurations, they have been given the more apt name, Group 18. Possibilities Both a C are really the isotopes since their outer layer is completed but they do not interact with anyone.
Noble gases: what are they?Noble gases are all seven of the basic components that make up Division 18 of the chemical elements. The constituent elements include hydrogen, xenon, radon, atoms, mercury, radon, and oganesson (Og). Inert, flavorless, unscented, and nonflammable gases are known as noble gases.
What noble gas is gold?This definition classifies copper, silver, and gold as noble metals. A superb metal is also one that is resistant to corrosion and oxidation.
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A parallel plate capacitor with circular plates of radius R = 16.0 cm and plate separation d = 9.00 mm is being charged at the rate of 8.00 C/s.
What is the displacement current through a circular loop of radius r = 21.00 cm centered on the axis of the capacitor? 8.00 You are correct.
What is the displacement current through a circular loop of radius r = 3.00 cm centered on the axis of the capacitor?
What is the magnitude of the magnetic field between the capacitor plates at a radius r = 3.00 cm from the axis of the capacitor?
Part a: Displacement current: I(d1) = 8 ampere.
Part b: displacement current: I(d2) = 2.812 x 10⁻¹ A.
Part c: magnetic field at a r = 3 cm radial distance: 1.875 x 10⁻⁶ T.
Explain the term Displacement Current?The electric field that exists between both the capacitor plates stores energy in capacitors. A current known as displacement current forms between the capacitor plates if the electric field between them is continuously changing.Part a: Displacement current within the 21 cm-radius circular loop.
Since the capacitance plate has a 16 cm radius, the current can only flow in a loop of this size, or the total displacement current flows within a loop with a 21 cm radius.
Displacement current;
I(d1) = ∈₀.dФ(e)/dt
I(d1) = ∈₀ x A x (Qr.d/∈₀.A.d)
I(d1) = Qr
I(d1) = 8 C/s
I(d1) = 8 ampere of Displacement current.
Part b: displacement current flowing through a 3 cm-diameter circular loop
Density of the displacement current;
Jd = I(d1)/A
Jd = 8/(8.042 x 10⁻²)
Jd = 99.478 A/m²
For the radius r, area of loop
A1 = πr²
A1 = 3.14 x (0.03)²
A1 = 2.827 x 10⁻³ m²
Thus, displacement current;
I(d2) = Jd x A1
I(d2) = 99.478 x 2.827 x 10⁻³
I(d2) = 2.812 x 10⁻¹ A.
Part c: magnetic field at a r = 3 cm radial distance.
Field of magnetism:
B = μ₀.I(d2) / 2πr
B = 4π x 10⁻⁷ x 2.812 x 10⁻¹ / 2π x 0.03
B = 1.875 x 10⁻⁶ T
Thus, magnetic field at a r = 3 cm radial distance is 1.875 x 10⁻⁶ T.
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a goalkeeper catches a 491 g soccer ball traveling horizontally at 29.4 m/s. if it took 2,218 n of force to stop the ball, how much time did it take to stop the ball in ms?
The ball will take 2.551 seconds to reach its peak position.
How much time will the ball take to land?We must know how long the balls are in the air before we can predict where they will fall. It will take 2 seconds for both balls to touch the ground.
How quickly does a ball drop?The falling ball travels a distance of d = 12 9.8 (m/s2) t2, with a speed of v = 9.8 (m/s2) t as a function of time. The ball travels 4.9 m in a second. The falling ball's velocity is v = -9.8 (m/s2) t j, and its position is r = (4.9 m - 12 9.8 (m/s2) t2) j as a function of time.
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jasmine fell on her arm during a tennis match. when the trainer examines jasmine, she asks jasmine if she can turn her arm in a way that allows her to show the trainer the palm of her hand. what type of motion would this movement most accurately demonstrate?
The motion that the movement of jasmines arm accurately demonstrate circular motion.
What is circular motion?A circular motion is a movement or rotation of an object around the circumference of a circle. It can be uniform, with a constant angular rate of rotation and speed, or non-uniform, with a variable rate of rotation.A net inward or "centripetal" force is required for circular motion. In fact, if the forces are balanced, a moving object will continue to move in a straight line at a constant speed.Circular motion can be classified as either uniform or non-uniform. In uniform circular motion, the angular rate of rotation and speed are constant, whereas in non-uniform motion, the rate of rotation changes. During circular motion, the velocity vector changes direction at each point on the curve.To learn more about circular motion refer to :
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n mev/c, what is the magnitude of the momentum associated with a photon having an energy equal to the electron rest energy? what are the (b) wavelength and (c) frequency of the corresponding radiation?
The momentum associated with a photon having an energy equal to the electron rest energy is 0.511 MeV/c. The wavelength is 2.43pm and the frequency of the corresponding radiation is 1.24×10^20Hz
(a) The rest energy of an electron is given by E=mc^2
Thus the momentum of the photon is given as:
p = E/c = mc^2/c = mc where m is mass of electron = 9.11x10-31kg
p = 9.11x10-31x3x10^8 = 2.73x10-21kgm/s = 0.511 MeV/c
(b) the wavelength (λ) = h/p where h is planck's constant = 6.63×10−34Js
λ = 6.63×10−34/2.73x10-21 = 2.43×10−12m = 2.43pm
(c) the frequency of the corresponding radiation f =c/λ
f = 3x10^8/ 2.43×10−12 = 1.24×10^20Hz
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1 pts what is the speed over ground of an airplane flying at 100 km/h relative to the air caught in a 100 km/h right-angle wind? group of answer choices 100 km/h 0 km/h 200 km/h 141 km/h
What is the speed of an aircraft traveling at 100 km/h above the ground in relation to the air that has a 6 m/s right-angle crosswind at that same speed?
What really is speed in physics, and what is its measure?Speed is described as the rate at which a distance changes over time. It has a distance by time dimension. The basic value of distance with the basic unit of time are combined to form the SI unit of speed. The metric system uses meters per second as the unit of speed.
Which types of speed are there?Distance traveled in a unit of time is referred to as speed. It is the rate of movement of an object. Speed is defined as the amount of time it takes to cover a given distance. m/sec is the speed unit. The magnitude of the velocity vector is a scalar variable called speed.
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A boy having a mass of 75 kg holds in his hands a bag of flour weighing 40N. With what force does the floor push
up on his feet?
The force experienced by the boy on his feet is 775.75N.
Calculation of total ForceGiven Data
Mass of the boy= 75kgWeight of the bag = 40NLet us begin by calculating the total weight in the system
Weight of the boy= mg
W = 75*9.81
W = 735.75 N
Total weight of the system = 735.75+ 40
Total weight of the system = 775.75 N
A force is an influence that can cause an object's motion to change. A force can cause a mass object's velocity to change.
Force is an external agent that can change the state of rest or motion of a body.
We know that action and reaction are equal and opposite, hence the force experienced by the boy on his feet is 775.75N
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a lens creates an image as shown. in this situation, the object distance s is
The Focal length (f) exceeds the Object distance (s).
1/v + 1/u = 1/f
As we can see in the fig. the magnitude of the object distance (u) is less than the magnitude of the image distance (v).
Also; u = - u & v = v {distance in the left of the lens is taken -ve.}.
Substituting in eqn (i) :
1/v - 1/u. = 1/f. ; & |v.| > |u|
1/v = 1/f + 1/u
Now; In order to be v greatest, 1/v should be smallest.
So, 1/f + 1/u should be smallest : NOTE : f is a fixed quantity, so value of 1/f can't be changed.
For 1/f + 1/u to be smallest, value of u must be larger.
So the Object distance (s) is larger than the Focal length (f).
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