Questions from College Physics

Q: A metal sphere is initially uncharged. After being touched by a

A metal sphere is initially uncharged. After being touched by a charged rod, the metal sphere is positively charged. (a) Is the mass of the sphere larger, smaller, or the same as before it was charge...

Q: A mass-and-spring system oscillates with amplitude A and

A mass-and-spring system oscillates with amplitude A and angular frequency ω. (a) What is the average speed during one complete cycle of oscillation? (b) What is the maximum speed? (c) Find the rat...

Q: A 2.0 kg object is at rest on a frictionless

A 2.0 kg object is at rest on a frictionless surface when it is hit by a 3.0 kg object moving at 8.0 m/s. If the two objects are stuck together after the collision, what is the speed of the combinatio...

Q: In this problem, use Ampere's law to show that the magnetic

In this problem, use Ampere's law to show that the magnetic field inside a long solenoid is B = μ0nI. Assume that the field inside the solenoid is uniform and parallel to the axis and th...

Q: A roller coaster car of mass 320 kg (including passengers)

A roller coaster car of mass 320 kg (including passengers) travels around a horizontal curve of radius 35 m. Its speed is 16 m/s. (a) What are the magnitude and direction of the total force exerted o...

Q: A particle decays in flight into two pions, each having a

A particle decays in flight into two pions, each having a rest energy of 140.0 MeV. The pions travel at right angles to each other with equal speeds of 0.900c. Find (a) the momentum magnitude of the...

Q: When a proton and an antiproton annihilate, the annihilation products are

When a proton and an antiproton annihilate, the annihilation products are usually pions. (a) Suppose three pions are produced. What combination(s) of π+, π−, and π0 are possible? (b) Suppose five pi...

Q: Electronic devices are usually enclosed in metal boxes. One function of

Electronic devices are usually enclosed in metal boxes. One function of the box is to shield the inside components from external electric fields. (a) How does this shielding work? (b) Why is the deg...

Q: Why does the resistivity of a metallic conductor increase with increasing temperature

Why does the resistivity of a metallic conductor increase with increasing temperature?

Q: A hedge trimmer has a blade that moves back and forth with

A hedge trimmer has a blade that moves back and forth with a frequency of 28 Hz. The blade motion is converted from the rotation of an electric motor to oscillatory motion by means of a Scotch yoke (s...