Questions from College Physics

Q: As you talk on a cell phone, does the mass of

As you talk on a cell phone, does the mass of the phone's battery change at all? If so, does it increase or decrease?

Q: A particle with nonzero mass m can never move faster than the

A particle with nonzero mass m can never move faster than the speed of light. Is there also a maximum momentum that the particle can have? A maximum kinetic energy? Explain.

Q: A proton (mass 1.67 × 10−27 kg

A proton (mass 1.67 × 10−27 kg, charge +e) is fired directly at a lithium nucleus (mass 1.16 × 10−26 kg, charge +3e). If the proton's velocity is 5.24 × 105 m/s when it is far from the nucleus, how fa...

Q: An astronaut in top physical condition has an average resting pulse on

An astronaut in top physical condition has an average resting pulse on Earth of about 52 beats per minute. Suppose the astronaut is in a spaceship traveling at 0.87c (γ = 2) with respect to Earth when...

Q: A constant force is applied to a particle initially at rest.

A constant force is applied to a particle initially at rest. Sketch qualitative graphs of the particle's speed, momentum, and acceleration as functions of time. Assume that the force acts long enough...

Q: Harry and Sally are on opposite sides of the room at a

Harry and Sally are on opposite sides of the room at a wedding reception. They simultaneously (in the frame of the room) take flash pictures of the bride and groom cutting the cake in the center of th...

Q: A thin soap film (n = 1.35) is

A thin soap film (n = 1.35) is suspended in air. The spectrum of light reflected from the film is missing two visible wavelengths of 500.0 nm and 600.0 nm, with no missing wavelengths between the two....

Q: A pendulum passes x = 0 with a speed of 0.

A pendulum passes x = 0 with a speed of 0.50 m/s; it swings out to A = 0.20 m. What is the period T of the pendulum? (Assume the amplitude is small.)

Q: A particle is confined to & finite box of length L.

A particle is confined to & finite box of length L. In the nth state, the wave function has n − 1 nodes. The wave function must make a smooth transition from sinusoidal inside th...

Q: In an Earth laboratory, an astronaut measures the length of a

In an Earth laboratory, an astronaut measures the length of a rod to be 1.00 m. The astronaut takes the rod aboard a spaceship and flies away from Earth at speed 0.5c. Is the length of the rod measure...