Questions from College Physics

Q: A spaceship of proper length 300. m takes 0.75

A spaceship of proper length 300. m takes 0.75 µs to pass an Earth observer. Determine the speed of this spaceship as measured by the Earth observer.

Q: The cosmic rays of highest energy are protons that have kinetic energy

The cosmic rays of highest energy are protons that have kinetic energy on the order of 1013 MeV. (a) From the point of view of the proton, how many kilometers across is the galaxy? (b) How long would...

Q: Choose the option that makes the following statement correct. Two events

Choose the option that makes the following statement correct. Two events at a single location define a time interval. The proper time interval Δtp is measured by an observer [(a) at rest; (b) moving]...

Q: The nonrelativistic expression for the momentum of a particle, p =

The nonrelativistic expression for the momentum of a particle, p = mv, can be used if v

Q: The length of a moving spaceship is 28.0 m according

The length of a moving spaceship is 28.0 m according to an astronaut on the spaceship. If the spaceship is contracted by 15.0 cm according to an Earth observer, what is the speed of the spaceship?

Q: (a) Show that a potential difference of 1.02

(a) Show that a potential difference of 1.02 x 106 V would be sufficient to give an electron a speed equal to twice the speed of light if Newtonian mechanics remained valid at high speeds. (b) What sp...

Q: The muon is an unstable particle that spontaneously decays into an electron

The muon is an unstable particle that spontaneously decays into an electron and two neutrinos. In a reference frame in which the muons are stationary, if the number of muons at t = 0 is N0, the number...

Q: Imagine that the entire Sun collapses to a sphere of radius Rg

Imagine that the entire Sun collapses to a sphere of radius Rg such that the work required to remove a small mass m from the surface would be equal to its rest energy mc2. This radius is called the gr...

Q: The identical twins Speedo and Goslo join a migration from Earth to

The identical twins Speedo and Goslo join a migration from Earth to Planet X, which is 20.0 light - years away in a reference frame in which both planets are at rest. The twins, of the same age, depar...

Q: An interstellar space probe is launched from Earth. After a brief

An interstellar space probe is launched from Earth. After a brief period of acceleration, it moves with a constant velocity, 70.0% of the speed of light. Its nuclear - powered batteries supply the ene...