when light reflects on a smooth surface it undergoes no change in Speed, Wavelength and Frequency.
What is light?An electromagnetic wave called a light wave can go through the vacuum of space. Electric charges vibrate and create light waves. A transverse wave with both an electric and a magnetic component is known as an electromagnetic wave.
There is a huge variety of frequencies for electromagnetic waves. The electromagnetic spectrum is a continuous range of frequencies. White is the color that is seen when the entire visible light spectrum is received by your eye at once. Thus, visible light is sometimes referred to as white light. Technically speaking, white is not a color at all, but rather the combination of all the colors of the visible light spectrum
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at a distance of 6 meters, a person with average vision is able to clearly read letters 1.0 cm high.
The height of the image that will be magnified on the retina will be 0.0022833m or .22833cm and it will be inverted.
What is magnification?
When anything is magnified, its seeming size is increased rather than its real size. This enlargement is quantified using a mathematical quantity called "magnification." When this number is less than one, a drop in size is frequently referred to as "magnification" or "de-magnification."
Briefing:
Given,
The distance of, u = 6 meters
The lens distance from the retina, v = 1.7 cm
The height of the object, hu = 1 m
We have to find the size of letters that appears in the retina, hv;
Here,
Magnification, M = -v/u = [tex]\frac{h_{v} }{h_{u} }[/tex]
- 0.017/6 = hv/1
hv = -0.017/6
hv = -0.002833m
The image height will be 0.002833 m and it will be inverted.
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a vertical spring stretches 9.6 cm when a 1.3 kg block is hung from its end. (a) calculate the spring constant. this block is then displaced an additional 5.0 cm downward and released from rest. find the (b) perio
The spring constant is 133 N/m and time period is 0.62 seconds.
(a) The spring stretches until the magnitude of its upward force on the
block equals the magnitude of the downward force of gravity: ky=mg,
where y= 0.096m is the elongation of the spring at equilibrium,
k = the spring constant, and m=1.3kg is the mass of the block.
Thus,
k=mg/y= (1.3)(9.8m/s ^2)/(0.096m)=133 N/m.
(b) The period is given by, T = 1/f = [tex]\frac{2\pi }{\alpha }[/tex] = [tex]2\pi \sqrt{\frac{m}{k} }[/tex]
where, m = mass and k = spring constant
Given , m = 1.3 kg and k = 133N/m
putting these values in above equation we get,
T = 0.62 seconds
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find the magnitude of the earth's velocity as it travels around the sun. assume a year of 365 days.
The magnitude of the earth's velocity as it travels around the sun is Vo = 29.87 Km/s
What is angular velocity ?In basic words, angular velocity is the time rate at which an item rotates or revolves about an axis. Angular velocity is represented by the Greek letter omega (ω, sometimes Ω). The SI unit for angular velocity is radians per second because it is expressed as an angle per unit of time.
According to the given information
Orbital velocity Vo = 2[tex]\pi[/tex]r/T
Vo = 2 × 3.14 × 1.5 × 10^11/365 ×24× 60×60
Vo = 29.87 Km/s
Angular velocity and linear velocity are related as V = r W
So
W = 29.87×10^3/1.5×10^11
W = 1.991×10^-7 rad/s
The magnitude of the earth's velocity as it travels around the sun is Vo = 29.87 Km/s
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when two bumper cars collide, the force exerted on each car causes a change in the momentum for each car. the total for both cars is the same before and after the collision. a. terminal velocity c. gravity b. inertia d. momentum
When two bumper cars collide, the force exerted on each car causes a change in the momentum for each car. the total momentum for both cars is the same before and after the collision.
Momentum can be defined as the impulse gained by a moving object.
Also it can be defined as the product of an object with the velocity by which it is moving.Momentum can only be calculated when the body is in motion.The SI unit for momentum is kg-m/sIt is a vector quantity and has the direction same as that of the velocity of the object.It is represented by M and mathematically, M = Mass * VelocitySince it is a product of mass and velocity the product would not change even if the mass and velocity of the object changes after the collision.
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For each of the following pictures, list the layers from oldest to
newest. Put the letters, numbers or words in order under the picture.
B
E
(F)
Question: Order oldest to newest.
I
Igneous
intrusion
CORE AGGE
Answer:
Igneous
CORE AGE
intrusion
Since v = lambda f, the speed v of a wave depends on its wavelength lambda. True False
False, Since v = lambda f, a wave's velocity v is independent of its wavelength lambda. mainly because the medium's characteristics affect the wave's speed.
For instance, the elastic and inertial properties of the medium affect the wave's speed for a mechanical wave. Wavelength Simply said, the wavelength is the separation between the wave crests. Additionally, a wide variety of objects move in waves of varying sizes, including light, air, water, strings, and air (which are all types of waves). In addition, we use the Greek symbol lambda to denote the wavelength of the wave (). But most people are unaware that there is a formula used to calculate wavelength.
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If a weightlifter lifts 2000 newtons to a height of 2 metres in 4 seconds, how powerful is he?.
The weightlifter can exert a power of 1000 watts, for the given work done and time.
What is Power?The quantity of energy moved or converted per unit of time is known as power. The watt, or one joule per second, is the unit of power in the International System of Units. Power is a scalar quantity.
What is Work done?Only when a particular distance is traversed or when force is applied is work performed. No work is done if the force given to the object does not cause it to move.
Calculations:
Power (P) = work done/time taken
Work done = 2000N * 2m = 4000Nm
Time taken = 4 seconds
P= 4000Nm/4sec = 1000watts
So, the person can exert a power of 1000 watts.
Hence, the weightlifter can exert a power of 1000 watts, for the given work done and time.
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Light rays are:
running out, expensive, spread thinly
please help me I'm really struggling
Answer:
running out, expensive, spread thinly
Explanation:
two rollerbladers face each other and stand at rest on a flat parking lot. tracey has a mass of 32 kg, and jonas has a mass of 45 kg. when they push off against one another, jonas acquires a speed of 0.35 m/s .what is tracey's speed?
Since the momentum remains same before and after push-off, therefore Tracey's speed will be 0.492 m/s.
Momentum is a product of mass and the velocity of a body.
The SI unit for momentum is kg-m/sIt is a vector quantity and has the direction same as that of the velocity of the object.It is represented by M and mathematically, M = Mass * VelocityThe initial momentum is always equal to the final momentum during collisions between two bodies.
Therefore; M₁U₁ +M₂U₂ = M₁V₁+ M₂V₂,
where M₁ is the mass of Tracey
M₂ is the mass of Jonas,
U is the initial velocity
V is the final velocity.
(32 ×0)+ (45×0) = (32 × V₁) + (45 × 0.35)
0 = 32V₁ + 15.75
32 V₁ = - 15.75
V₁ = - 0.492 ( negative sign indicates difference in direction)
There, Tracey's speed will be 0.492 m/s.
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a 0.50-kg mass is attached to a spring of spring constant 20 n/m along a horizontal, frictionless surface. the object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position. what is the amplitude of vibration?
The vibration amplitude of a spring with a constant of 20 N/m which has a speed of 1.5 m/s with a mass of 0.50 kg which is associated = 0.237 m.
Oscillation EnergyWhen an object oscillates on a spring, the kinetic energy and potential energy of the mass-spring system change with time.
The total energy (the kinetic energy + potential energy) is constant.
The kinetic energy of an object moving with speed v is:
½ mv².
The potential energy of a spring with a constant k is:
= ½ kx².
The total energy = ½ kx² + ½ mv² = ½ kA².
The total energy equation gives the general property of simple harmonic oscillations which is directly proportional to the square of the amplitude.
And, we have:
m = 0.50 kg
k = 20 N/m
v = 1.5 m/s
Remember, the total energy = ½ kA².
So,
A² = (m)(v)² / k
= (0.50) (1.5)² / 20
= 0.05625
A = [tex]\sqrt{0.05625}[/tex]
= 0.237 m
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A bow wave is produced when a speed boat moves O as fast as the waves it produces.
O faster than the waves it produces. O nearly as fast as the waves it produces. O none of the above
A bow wave is produced when a speed boat moves faster than the waves it produces.
The ship's speed, draught, surface waves, water depth, and bow form all influence how big the bow wave is. Large bow waves will be produced by a ship with a deep draught and blunt bow, whereas smaller bow waves will be produced by vessels that plane over the water. The field of computational fluid dynamics investigates bow wave patterns.
At the price of the ship's kinetic energy, the bow wave removes energy from the ship, slowing the ship. Therefore, decreasing the bow wave's size and enhancing the ship's fuel efficiency are two key objectives of naval architecture. This is frequently accomplished on modern ships by fitting them with bulbous bows.
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if the pressure in a gas is tripled while its volume is held constant, by what factor does vrms change?
The rms velocity will become √3 times the actual or original value, if pressure is tripled.
The rms velocity of gas molecules is directly proportional to the square root of temperature. But it is Inversely proportional to the square root of molar mass. The equation can be expressed as: Vrms ∝ √T
If the pressure is tripled, the will be tripled. And volume is kept constant. temperature. Then rms velocity becomes √3 times the actual or original value. Since rms velocity is directly proportional to √T.
Therefore, the rms velocity will become √3 times the actual or original value.
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suppose there are a million habitable planets in our galaxy, that one in ten are habitable, that one in a thousand planets with life had at some point had an intelligent civilization, and that one in a hundred civilizations that has ever existed is in existence now. given this, how many civilizations are in existence now?
Only one civilization is in existence now. The human civilization that is present on the earth is the civilization that exists in this period of time. It can also exist in the coming future for several centuries.
Earth is the only planet where intelligent civilization can exist. Atmospheric conditions are also not so suitable for life to exist on planets other than earth. The other habitable planets in the galaxies have conditions that can help to persist life. The availability of water and oxygen on the planets gives a trace of a complete package of materials that makes life possible on other planets.
Some of the technological advancements such as building a spacecraft and placing a satellite in space are the areas of searching of life on other planets.
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a constant force is exerted for a short time interval on a cart that is initially at rest on an air track. this force gives the cart a certain final speed. suppose we repeat the experiment but, instead of starting from rest, the cart is already moving with constant speed in the direction of the force at the moment we begin to apply the force. after we exert the same constant force for the same short time interval, the increase in the cart’s speed
The cart's increased speed is the same as when it first took off.
What does speed in physics mean?Rate is the speed from which an object travels along a path over time, whereas velocity is the speed and orientation of an item's motion.
Briefing:We're informed that;
At first, the cart is at rest. So, u = 0 m/s.
A brief period of time is spent with a constant force applied.
The final speed that the force gives the cart is what we'll call v.
Newton's first equation of motion yields the following results:
v = u + at
Where;
The ultimate speed is v.
The starting speed is u.
Acceleration is a.
t is time.
u = 0 m/s, therefore we now have;
v = 0 + at
v = at
Let's now use Newton's second rule of motion to construct a formula to introduce force;
F = ma
Where;
Force is f.
mass is m.
Acceleration is a.
So, a = F/m.
F/m for an in and v = at to obtain;
v = (F/m)t
The final speed, v, is evidently exactly related to the force. So, if the force is constant, the end speed will also stay constant.
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The complete question is -
A constant force is exerted for a short time interval on a cart that is initially at rest on an air track. This force gives the cart a certain final speed. Suppose we repeat the experiment but, instead of starting from rest, the cart is already moving with constant speed in the direction of the force at the moment we begin to apply the force.
After we exert the same constant force for the same short time interval, the increase in the cart's speed:
A. is equal to two times its initial speed.
B. is equal to the square of its initial speed.
C. is equal to four times its initial speed.
D. is the same as when it started from rest.
E. cannot be determined from the information provided.
Khan academy need help asap
The correct expression of the acceleration of the object is given as; a = F/m. Option B.
What is the acceleration?We know that the acceleration has to do with the ratio of the force and the mass. The Newton second law can lead us to the definition of the force that acts on an object that does involve the acceleration of the object.
We then have;
F = ma
F = force on the object
m = mass of the object
a = acceleration of the object
Then we have;
a = F/m
This is the acceleration of the woman.
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Which of the following objects has the smallest radius? Select an answer and submit: For keyboard navigation, use the up/down arrow keys to select answer
a. 0.9 solar mass white dwarf
b. 1.2 solar mass white dwarf
c. 1.6 solar mass neutron star
d. 1.9 solar mass neutron star
0.9 solar mass The radius is smallest for a white dwarf. A common unit of mass used in astronomy is the solar mass, which is roughly 2 10 kg. It is frequently employed to denote the masses of other stars.
Including black holes, galaxies, nebulae, star clusters, and more. In other words, the atomic radius is smaller because the electrons are being drawn closer to the nucleus by a stronger force of attraction. Additionally, anions are larger than their corresponding atoms due to electron-electron repulsion, which causes them to spread apart. It follows that Cl has the shortest radius. Almost every aspect of a star, including its brilliance, size, evolution, longevity, and ultimate fate, is governed by its starting mass.
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A helium-filled balloon (whose envelope has a mass of mb=0.250kg) is tied to a uniform string of length ℓ=2.00m and mass m = 0.0500 kg. The balloon is spherical with a radius of r = 0.400 m. When released in air of temperature 20∘C and density rhoair=1.20kg/m3, it lifts a length h of string and then remains stationary. We wish to find the length of string lifted by the balloon. (a) When the balloon remains stationary, what is the appropriate analysis model to describe it? (b) Write a force equation for the balloon from this model in terms of the buoyant force B, the weight Fb of the balloon, the weight FHe of the helium, and the weight Fs of the segment of string of length h. (c) Make an appropriate substitution for each of these forces and solve symbolically for the mass ms of the segment of string of length h in terms of mb, r, rhoair , and the density of helium rhoHe, (d) Find the numerical value of the mass ms. (e) Find the length h numerically.
got the ans
A helium-filled balloon (whose envelope has a mass of mb=0.250kg) is tied to a uniform string of length ℓ=2.00m and mass m = 0.0500 kg. The balloon is spherical with a radius of r = 0.400 m. When released in air of temperature 20∘C and density rhoair=1.20kg/m3, it lifts a length h of string and then remains stationary. We wish to find the length of string lifted by the balloon. (a) When the balloon remains stationary, what is the appropriate analysis model to describe it? (b) Write a force equation for the balloon from this model in terms of the buoyant force B, the weight Fb of the balloon, the weight FHe of the helium, and the weight Fs of the segment of string of length h. (c) Make an appropriate substitution for each of these forces and solve symbolically for the mass ms of the segment of string of length h in terms of mb, r, rhoair , and the density of helium rhoHe, (d) Find the numerical value of the mass ms. (e) Find the length h numerically.
Ultrasound waves at intensities above 104 W/m2 can do serious damage to living tissues. a) If 104 W/m2 corresponds to 160 dB, what is the sound intensity level, in decibels, of ultrasound with intensity 105 W/m2, used to pulverize tissue during surgery? β =
Ultrasound waves at intensities above 104 W/m² can do serious damage to living tissues, 104 W/m² corresponds to 160 dB, 170 dB is the sound intensity level, in decibels, of ultrasound with intensity 105 W/m²,
What is ultrasound waves?An ultrasonic scan employs high-frequency sound waves to generate a picture of a person's interior body components. Ultrasound is frequently used by medical professionals to examine a growing foetus (unborn child), a person's abdominal and pelvic organs, muscles, tendons, heart, and blood vessels.
Given that,
Ultrasound waves at intensities above 10⁴ W/m² corresponds to 160 dB.
ultrasound with intensity 10⁵ W/m².
Sound intensity levels in dB is defined as:
β = 10 log [tex](\frac{I}{I_0})[/tex]
where [tex]I_0[/tex] is the reference intensity levels.
so, β₁ - β₂ = 10 log [tex](\frac{I_1}{I_0})[/tex] - 10 log [tex](\frac{I_2}{I_0})[/tex]
or, β₁ - β₂ = 10 log [tex](\frac{I_1}{I_2})[/tex]
or, β₁ = β₂ + 10 log [tex](\frac{I_1}{I_2})[/tex]
so, for β₂ = 160 dB, I₂ = 10⁴ W/m² , I₁ = 10⁵ W/m²
or, β₁ = β₂ + 10 log [tex](\frac{10^4}{10^5})[/tex]
or, β₁ = 160 + 10 log [tex](\frac{10^4}{10^5})[/tex]
or, β₁ = 170 dB.
Thus, the sound intensity level is: 170 dB.
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A node is a position of
A node is a position of a) minimum amplitude.
In the field of physics, the position where there is the lowest amplitude present in a particular wave is referred to as a node.
In a wave, the nodes can be produced as the regions of destructive interference where the amplitude is minimum.
For example, consider a guitar that has its strings vibrating. In such a case, the place where there will be minimum amplitude will be the ends of each string. Hence, we will refer to the ends of each string as the nodes of the guitar.
On the other hand, anti-nodes are the positions on a wave where the amplitude is the highest.
Although a part of your question is missing, you might be referring to this question:
A node is a position of
a) minimum amplitude
b) maximum amplitude
c) maximum resonance
d) minimum resonance
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a rounded object with 2 kg mass and 10 cm radius is released from rest at the top of 14 m tall incline with a 30o angle, and coefficients of friction . a) at the bottom of the incline the linear speed is 14 m/s. is the object a solid sphere, a disc, or a spherical shell? b) suppose we increase the angle of the incline above 30o. at what angle will the object start to slide instead of roll?
10.66 meters per second will be the bottom speed.
Briefly:-We have specified that the object has a mass of 2 kg and that the plane has produced an angle of 72 meters.
The rate of acceleration will be equal to
α=ΔωΔt α = Δ ω Δ t
The rate of acceleration will be equal to t = t
Starting speed u = 0 m/sec
The velocity at the plane's bottom, or final velocity v, must be determined.According to the third law of motion,
v^2=v_0^2+2ad.
So
v = 10.66 m/sec
Is angle proportional to acceleration?Since the relationship is linear and passes through the origin, the acceleration of an object moving down an incline is precisely proportional to the sine of the incline's angle.
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the asteroid belt circles the sun between the orbits of mars and jupiter. one asteroid has a period of 5.7 earth years.
The asteroid belt circles the sun between the orbits of mars and jupite is 4.38 x 10^11m .
What is Kepler's 3rd law?
The cubes of the semi-major axes of the planets' orbits are precisely proportional to the squares of the planets' orbital periods. According to Kepler's Third Law, as an orbiting planet's radius rises, so does the time of its orbit around the Sun.
Using Kepler's 3rd law which is: T² = 4π²r³ / GM
Solved for r :
r = [GMT² / 4π²]⅓
Where G is the universal gravitational constant, M is the mass of the sun,T is the asteroid's period in seconds, and r is the radius of the orbit.
Change 5.00 years to seconds :
5.00years = 5.00years(365days/year)(24.0hours/day)(6... = 1.58 x 10^8s
The radius of the orbit then is computed:
r = [(6.67 x 10^-11N∙m²/kg²)(1.99 x 10^30kg)(1.58 x 10^8s)² / 4π²]⅓ = 4.38 x 10^11m
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the period of a mass-spring oscillator is 2.84 s. every time the oscillator completes a full period, the amplitude of the oscillation gets reduced to 93.6 percent of the previous amplitude. how much time does it take for the amplitude to decay to 43.2 percent of its original initial value?\
30.05 sec much time it takes for the amplitude to decay to 43.2 percent of its original initial value
What is amplitude?The greatest displacement or distance that a point on a wave or vibrating body may travel in relation to its equilibrium position It is equivalent to the vibration path's half-length.
Given data
Time period (T) = 2.84 sec
Reduction = 93.6 %
We know that logarithmic decrement is given by:
a₁ = a₀ [tex]e^-{bt}[/tex]
where b = constant
As a₁ = 0.936 a₀
or, 0.936 a₀ = a₀ [tex]e^-{b*2.84}[/tex]
or, b = 0.002
Now a₁ = 0.432 a₀
or, 0.432 a₀ = a₀ [tex]e^-{0.002*t}[/tex]
or, t = 30.05 sec
So, it will take 30.05 sec to decay 43.2 %.
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how is the motion of galaxies in our local group different from what we observe for distant galaxies? group of answer choices most are moving away from us. they all appear to orbit us. some are moving toward us. some are rotating very rapidly.
We notice that some distant galaxies are travelling in our direction, but the motion of the galaxies in our local group is different. A true image of the actual galaxies was used to create the composite image.
Of the Local Group. Are members of the Local Group. If not in exact scale, the galaxies have been positioned in the roughly proper orientation. Edwin Hubble was the first to recognise the Local Group at the time of the earliest observations of redshift and distance. Stars, stellar remnants, interstellar gas, dust, and dark matter are all gravitationally bonded together in a motion. The term is literally "milky," alluding to the Milky Way.
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I NEED HELP!!!Two billiard balls collide. Ball 1 moves with a velocity of 6 m/s, and ball 2 is at rest. After the collision, ball 1 comes to a complete stop. What is the velocity of ball 2 after the collision if each ball has a mass of 0.25 kg?
Answer:
6m/s
Explanation:
since the mass are the same
M(U1+U2) = M2V
0.25(6+0)=0.25V
1.6 = 0.25V
V = 1.6/0.25
V = 6m/s
i maybe wrong or right
what is the equation for centripetal acceleration in terms of angular velocity and the radius?
ac=rω² In terms of rad/s, angular velocity describes how quickly an item is rotating around a curve. This acceleration is also known as a radial acceleration since it acts along the radius of the curved path.
What is centripetal acceleration?Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's centre.
What causes centripetal acceleration?Centripetal accelerations are brought on by centripetal forces. The gravitational pull between them produces the centripetal force that drives the motion in the unique situation of the Earth's clockwise direction around the Sun and any satellite's rotational inertia around in any celestial body.
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how many wavelengths of the radio waves are there between the transmitter and radio receiver if the woman is listening to an am radio station broadcasting at 1540 khz?
Wavelengths of the radio waves between the transmitter and radio receiver if the woman is listening to an am radio station broadcasting at 1540 Khz is 194 m.
We can deduce three important relationships from the wave equation:
Speed is directly proportional to wavelengthSpeed is directly proportional to frequencyWavelength is inversely proportional to frequencySo the relation is : v = λf
where, v = speed of wavelength
λ = wavelength
f = frequency
Given, frequency (f) = 1540Khz = 1540000hz
v = speed of light = [tex]3 * 10^{8} m/s[/tex]
Putting these values in above equation we get λ = 194m
So Wavelengths of the radio waves between the transmitter and radio receiver if the woman is listening to an am radio station broadcasting at 1540 Khz is 194 m.
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r. suppose you could travel to jupiter and observe changes in positions of nearby stars during one orbit of jupiter around the sun. describe how those changes would differ from what we would measure from earth. how would your ability to measure the distances to stars from the vantage point of jupiter be different?
The parallax of stars, as viewed from the orbit of Jupiter, would be about twenty five times larger, since Jupiter's orbit around the Sun is about five times larger than that of Earth.
Parallax distances would be easier to measure from Jupiter's orbit—for the same accuracy, one could measure distances about twenty five times farther than we can from Earth.
What is parallax distance?Parallax distance is the measuring of how nearby object appears to move against the background of more distant objects.
The principle of parallax., is used by astronomers to measure large distances, such as the distance of a planet or a star from Earth.
The term parallax is the semi-angle of inclination between two sight-lines to the star, as observed when Earth is on opposite sides of the Sun in its orbit.
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a proton is accelerated from rest through a potential difference vo and gains a speed v. if it were accelerated instead through a potential difference of 2v0, what speed would it gain?
The speed of proton will be √2vo.
For more than 2,000 years, scientists thought that the atom was the smallest possible particle. Then they discovered that it has a nucleus composed of protons and neutrons surrounded by electrons.
They then discovered that protons and neutrons themselves have a complex inner world full of quarks and antiquarks held together by a superglue-like force created by gluons.
Later experiments with protons accelerated to speeds close to the speed of light showed that the proton is even more complex than originally thought.
For example, it contains countless particles that interact with each other—not just three quarks bound to gluons. And gluons can briefly turn into quark-antiquark pairs before annihilating each other and becoming gluons again.
Most of these results have come from particle accelerators like the one at DOE's Fermi National Accelerator Laboratory.
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how much faster does a climber on top of the mountain move than a surfer at a nearby beach? the earth's radius is 6400 km .
The person at the top of the mountain is faster than the person at the beach by 22cm/s.
When the object is oscillating about the origin, repeatedly going left and right by identical amounts it has a time period T where the period T is the time required for one complete oscillation or cycle. The angular frequency ω is related to the period of the motion by an equation in the form
ω[tex]=\frac{2\pi }{T}[/tex]
Where T is the period of the earth. The period of the earth to complete one cycle is 24 hours, so it is in seconds given by
T = [tex]( 24 h)\frac{3600 s}{ 1 h}[/tex] = 86.4 × 10³ s
Now, we plug the value for T into equation (1) to get ω into rad/s
ω [tex]=\frac{2\pi }{T} \\[/tex]
ω = [tex]\frac{2\pi }{86.4 * 10^{3} s}[/tex]
ω = 7.27 × [tex]10^{-5}[/tex] rad/s
Both persons at the beach and at the top of the mountain have a velocity that is tangent to the circle of motion, and its acceleration is called centripetal acceleration. Any object on earth has angular velocity ω and a tangential speed v and they are related to each other by an equation in the form
v = ω r
Where r is the radius of the circle of the motion.
For the person at the beach, its radius of motion is the same as the radius of the earth r = R while for the person at the top of the mountain its radius of motion is [tex]R_{E}[/tex] + 3000
[tex]v_{Beach}[/tex] = ω[tex]R_{E}[/tex]
= [tex]( 7. 27 * 10^{-5} rad/s ) (6400 * 10^{3} )[/tex]
= 465.280 m/s
[tex]v_{Mountain}[/tex] = ω[tex](R_{E} + 3000)[/tex]
= [tex]( 7.27 * 10^{-5} rad/s) ( 6400 * 10^{3} + 3000m )[/tex]
= 465.498 m/s
As shown by the results, the person at the top of the mountain has a fast speed. The difference between both velocities is expressed by
Δv =[tex]v_{Mountain}[/tex] - [tex]v_{Beach}[/tex]
= ( 468.498 - 465.280) m/s
= 0.22 m/s
= 22 cm/s
Hence, The person at the top of the mountain is faster than the person at the beach by 22cm/s.
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The complete question is:
A 3000-m-high mountain is located on the equator. How much faster does a climber on top of the mountain move than a surfer at a nearby beach? The earth’s radius is 6400 km.
what must the coefficient of static friction be for a car traveling at 115 km/h around the same turn?
Generally, the coefficient of static friction should be at least 0.7 for a car traveling at this speed, but this value could be higher depending on the specific conditions.
The coefficient of static friction, or μs, is the ratio of the maximum static force that can be applied without causing slipping to the normal force between two surfaces. The coefficient is affected by the surfaces in contact and the material they are made of.
The tires of a car also have an effect on the coefficient of static friction. Tires with a greater tread depth can provide better grip on the road and therefore have a higher coefficient of static friction than tires with a shallow tread. Tire pressure also plays a role, as low pressure can reduce the coefficient of static friction.
The weight of the vehicle is also an important factor. Heavier vehicles tend to have a higher coefficient of static friction, as the greater mass increases the normal force between the car and the surface.
In conclusion, the coefficient of static friction for a car traveling at 115 km/h around a turn depends on several factors, including the road surface, the vehicle's tires, and the vehicle's weight.
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