# When an object moves at a very high speed relative to an observer, its measured length in the direction of motion is contracted. t true?

When an object is moving towards the observer, its measured wavelength decreases,(it is not correct if measured length) because the waves are compressed.
Answer: That's true. It doesn't even need to be very high speed, although the effect is too small to measure at low speeds.

## Related Questions

Select the correct answer. An object of mass weighing 5.24 kilograms is raised to a height of 1.63 meters. What is the potential energy of the object at that height? Note that acceleration due to gravity is 9.8 meters/second2.
A.
65 joules
B.
84 joules
C.
91 joules
D.
1.0 × 102 joules
E.
1.5 × 102 joules

The gravitational potential energy of the object is B) 84 Joules

Explanation:

The gravitational potential energy (GPE) of an object is the energy possessed by the object by virtue of its position in a gravitational field.

Near the Earth's surface, the GPE of an object is calculated as:

where:

m is the mass of the object

is the acceleration of gravity

h is the heigth of the object relative the surface

For the object in this problem:

m = 5.24 kg

h = 1.63 m

So, its GPE is

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the answer to this question is option B. 84 joules

The-----------theory of matter states that all particles of matter are in constant motion.

That is the kinetic theory
The Kinetic Theory of Matter

You need the same amount of force to throw a basketball 3 meters as you need to throw a golf ball 3 meters. True or a False? Explain Why.

False because the more mass and object has, the more force you will need to move that object.

Which method of separation can be used for a heterogeneous mixture? A. by distillation
B. by densities
C. by chromatography
D. by acidification

A 20 g bullet is fired horizontally with a velocity of 250 m/s from a 1.5 kg rifle. If the rifle was held loosely, what would be the recoil velocity?

3.33 m/s

Explanation:

given,

mass of bullet, m = 20 g = 0.02 Kg

speed of bullet, v = 250 m/s

mass of rifle, M = 1.5 kg

speed of recoil, u = ?

initial speed of the bullet and the rifle is zero.

using conservation of momentum

(M + m) V = m v +  M u

(M + m) x 0 = 0.02 x 250 +  1.5 x u

1.5 u = -5

u = -3.33 m/s

negative sign represent that the recoil velocity is opposite to bullet velocity.

Hence, the recoil velocity is equal to 3.33 m/s

6. What amount of force is needed to accelerate a 560kg bus at 1.4m/s??

Explanation:

Force=mass×acceleration

Force=560×1.4

Force=784N

Explanation:ebebbebebebes

By what primary method of heat transfer does the sun warm the earth?

Sun warms the earth with Electromagnetic Radiations.

Sun emits out short range radiation in the form of Electromagnetic (EM) Radiation. Our Atmosphere is transparent to EM radiation. It does not heats up the atmosphere but when it collide with the solid objects or particles it is absorbed, reflected or refracted and the object heats up and start emitting radiation in the form of long wave radiation. Our Earth does the same. The long wave radiation emitted by the earth surface is absorbed by our atmosphere and it heats up. Therefore, we can say our atmosphere is heated from below.

How do you find displacement in a velocity vs time graph ?

The area between the line and the x-axis is equal to the displacement.

A person wants to make a metronome for music practice. He uses a 35-g object attached to a spring to serve as the time standard. What is the desired spring constant of the spring if the object needs to make 1.00 vibrations each second?

Assume that the spring obeys Hookes law, and ignore any possible damping due to air resistance or friction.

To develop this problem it will be necessary to apply the concepts related to the frequency of a spring mass system, for which it is necessary that its mathematical function is described as

Here,

k = Spring constant

m = Mass

Our values are given as,

Rearranging to find the spring constant we have that,

Therefore the spring constant is 1.38N/m