Questions from College Physics

Q: In this problem, you derive the expression for the self-

In this problem, you derive the expression for the self-inductance of a long solenoid [Eq. (20-30)]. The solenoid has n turns per unit length, length ℓ, and radius r. Assume that the current flowing i...

Q: In Chapter 19 we will see that a charged particle can undergo

In Chapter 19 we will see that a charged particle can undergo uniform circular motion when acted on by a magnetic force and no other forces. (a) For that to be true, what must be the angle between th...

Q: A space rock contains 3.00 g of /

A space rock contains 3.00 g of / and 0.150 g of /. / decays to / with a half-life of 1.06 × 1011 yr. If the rock originally contained no / , how old is it?

Q: Two oppositely charged parallel plates produce a uniform electric field between them

Two oppositely charged parallel plates produce a uniform electric field between them. An uncharged metal sphere is placed between the plates. Assume that the sphere is small enough that it does not af...

Q: An aluminum rod, 1.0 m long, is held

An aluminum rod, 1.0 m long, is held lightly in the middle. One end is struck head-on with a rubber mallet so that a longitudinal pulse—a sound wave—travels down the rod. The fundamental frequency of...

Q: Sketch some magnetic field lines for two identical bar magnets in the

Sketch some magnetic field lines for two identical bar magnets in the given configuration. Be sure to show field lines inside the magnets as well as outside.

Q: Deuterium (2D) is an isotope of hydrogen with a nucleus

Deuterium (2D) is an isotope of hydrogen with a nucleus containing one proton and one neutron. In a 2D-2D fusion reaction, two deuterium nuclei combine to form a helium-3 nucleus plus a neutron, relea...

Q: Use the following method to show that the torque on an irregularly

Use the following method to show that the torque on an irregularly shaped planar loop due to a perpendicular magnetic field is Ï„ = NIAB. The irregular loop of current in part (a) of the fi...

Q: What is the momentum of an automobile (weight = 9800 N

What is the momentum of an automobile (weight = 9800 N) when it is moving at 35 m/s to the south?

Q: Explain how an automobile airbag protects the passenger from injury. Why

Explain how an automobile airbag protects the passenger from injury. Why would the airbag be ineffective if the gas pressure inside is too low when the passenger comes into contact with it? What about...