Questions from College Physics

Q: The rest energy of an electron is 0.511 MeV.

The rest energy of an electron is 0.511 MeV. The rest energy of a proton is 938 MeV. Assume both particles have kinetic energies of 2.00 MeV. Find the speed of (a) The electron and (b) The proton. (c)...

Q: A CCD camera is equipped with a lens with constant focal -

A CCD camera is equipped with a lens with constant focal - length. As the f - number is decreased, determine whether the following quantities increase, decrease, or remain unchanged. Indicate your ans...

Q: A meter-stick moving at 0.900c relative to the

A meter-stick moving at 0.900c relative to the Earth’s surface approaches an observer at rest with respect to the Earth’s surface. (a) What is the meter-stick’s length as measured by the observer? (b)...

Q: A spring of force constant k is compressed by a distance x

A spring of force constant k is compressed by a distance x from its equilibrium length. (a) Does the mass of the spring change when the spring is compressed? Explain. (b) Find an expression for the ch...

Q: A star is 5.00 ly from the Earth. At

A star is 5.00 ly from the Earth. At what speed must a spacecraft travel on its journey to the star such that the Earth–star distance measured in the frame of the spacecraft is 2.00 ly?

Q: An electron has a total energy equal to five times its rest

An electron has a total energy equal to five times its rest energy. (a) What is its momentum? (b) Repeat for a proton.

Q: An astronaut wishes to visit the Andromeda galaxy, making a one

An astronaut wishes to visit the Andromeda galaxy, making a one - way trip that will take 30.0 years in the spaceship’s frame of reference. Assume the galaxy is 2.00 million light -...

Q: An alarm clock is set to sound in 10.0 h

An alarm clock is set to sound in 10.0 h. At t = 0, the clock is placed in a spaceship moving with a speed of 0.75c (relative to Earth). What distance, as determined by an Earth observer, does the spa...

Q: Owen and Dina are at rest in frame S', which is

Owen and Dina are at rest in frame S', which is moving with a speed of 0.600c with respect to frame S. They play a game of catch while Ed, at rest in frame S, watches the action (Fig. P26.45). Owen th...

Q: An observer in a coasting spacecraft moves toward a mirror at speed

An observer in a coasting spacecraft moves toward a mirror at speed v relative to the reference frame labeled by S in Figure P26.46. The mirror is stationary with respect to S. A light pulse emitted b...