Questions from College Physics

Q: An electrician working on “live” circuits wears insulated shoes and

An electrician working on “live” circuits wears insulated shoes and keeps one hand behind his or her back. Why?

Q: An RLC circuit has a resistance of 10.0 Ω,

An RLC circuit has a resistance of 10.0 Ω, an inductance of 15.0 mH, and a capacitance of 350 µF. By what factor does the impedance of this circuit change when the frequency at which it is driven chan...

Q: A fisherman notices a buoy bobbing up and down in the water

A fisherman notices a buoy bobbing up and down in the water in ripples produced by waves from a passing speedboat. These waves travel at 2.5 m/s and have a wavelength of 7.5 m. At what frequency does...

Q: A container is filled with gas at a pressure of 4.

A container is filled with gas at a pressure of 4.0 × 105 Pa. The container is a cube, 0.10 m on a side, with one side facing south. What is the magnitude and direction of the force on the south side...

Q: When a coin is tossed directly upward, what can you say

When a coin is tossed directly upward, what can you say about its velocity and acceleration at the high point of the toss?

Q: A negatively charged particle of mass 5.00 × 10−

A negatively charged particle of mass 5.00 × 10−19 kg is moving with a speed of 35.0 m/s when it enters the region between two parallel capacitor plates. The initial vel...

Q: A bird perched on a power line is not harmed, but

A bird perched on a power line is not harmed, but if you are pruning a tree and your metal pole saw comes in contact with the same wire, you risk being electrocuted. Explain.

Q: The figure shows a magnetic dipole antenna transmitting an electromagnetic wave.

The figure shows a magnetic dipole antenna transmitting an electromagnetic wave. At a point P far from the antenna, what are the directions of the electric and magnetic fields of the wave?

Q: A spherical balloon with a radius of 12.0 cm is

A spherical balloon with a radius of 12.0 cm is filled with helium. The bottom of the balloon is attached to a 2.30 m length of ribbon that is anchored to the ground. The balloon alone has a mass of 2...

Q: A bicycle wheel, of radius 0.30 m and mass

A bicycle wheel, of radius 0.30 m and mass 2 kg (concentrated on the rim), is rotating at 4.00 rev/s. After 50 s the wheel comes to a stop because of friction. What is the magnitude of the average tor...