length contration and time dilation

Do length contraction and time dilation occur at ordinary speeds (120 km/hr)?

Relativity - the sun rotated around the earth instead of the earth rotating around the sun?

Would it be valid, in lieu of relativity, to claim that the sun rotated around the earth instead of the earth rotating around the sun?

uncertainty principle and radioactivity

In lieu of the uncertainty principle, explain radioactivity

using uncertainty principle to find momentum

A 10 g bullet leaves a rifle mussel at a speed of 120 m/s. a.) if the uncertainty of the bullet's position is known to the accuracy of the barrel's radius (0.5 cm), what is the minimum uncertainty in the bullet's momentum? b.) Repeat for an electron. Where the accuracy of its position is known to be +/- 1 angstrom (10-10 m) ...continues

Wave Velocity

What is the velocity of a wave if its peak-to-peak cycles each require .000049 seconds and its wavelength is .456 meters?

Energy of a string

How much energy is there in a string of length 55 meters whose mass density is 7.3g/m, when the string is carrying a traveling wave with amplitude .95 meters and frequecny 77Hz, if the wave velocity is 50 m/s?

A sound source is moving toward a microphone...

A sound source is moving toward a microphone at 25 m/s, emitting sound at a constant frequency of 740 Hz (i.e. 740 pulses per second). If the source starts out 5 meters from the microphone then: -how many pulses are emitted as the source approaches the microphone? -how long is it between the instant the microphone receives ...continues

Angle of Rays

At what angle must a ray be incident as it apsses from a material which has index of refraction 1.41 to a material with index of refraction of 1.16. in order that the wave should remain in the original material?

Wave speed

If the distance between consecutive peaks of a wave is 4 meters, and if 40 peaks pass in a second, then how fast is the wave moving?

Sound waves

A hollow log, open at one end, is struck with a stout stick. The hoollow cavity of the log is 6 meters long, and the pressure waves that constitute sound travel at 342m/s. What are the frequencies of the resulting first four harmonics?