Questions from College Physics

Q: What is the potential energy for these two charges?

What is the potential energy for these two charges?

Q: A wheel of radius r rolls to the right without slipping on

A wheel of radius r rolls to the right without slipping on a horizontal road. Its axle moves at a constant speed vaxle. (a) Find the velocities of points A, B, and C with respect to the axle. Express...

Q: Ugonna stands at the top of an incline and pushes a 100

Ugonna stands at the top of an incline and pushes a 100 kg crate to get it started sliding down the incline. The crate slows to a halt after traveling 1.50 m along the incline. (a) If the initial spe...

Q: How much energy is converted by the muscles of an 80.

How much energy is converted by the muscles of an 80.0 kg person in climbing a vertical distance of 15 m? Assume that muscles have an efficiency of 22%; that is, the increase in gravitational potentia...

Q: Starting from rest, a package slides down a 2.8

Starting from rest, a package slides down a 2.8 m long ramp inclined 53° below the horizontal. If μk = 0.30, find the speed of the package at the bottom of the ramp.

Q: A frog is sitting on a lily pad when it sees a

A frog is sitting on a lily pad when it sees a delicious fly. He darts out his tongue at a speed of 3.7 m/s to catch the fly. The tongue has a mass of 0.41 g, and the rest of the frog plus the lily pa...

Q: For each of the lenses in the figure, state whether the

For each of the lenses in the figure, state whether the lens is converging or diverging.

Q: (a) Light of wavelength 300 nm is incident on a

(a) Light of wavelength 300 nm is incident on a metal that has a work function of 1.4 eV. What is the maximum speed of the emitted electrons? (b) Repeat part (a) for light of wavelength 800 nm incide...

Q: How can the lights in a home be dimmed using a coil

How can the lights in a home be dimmed using a coil of wire and a soft-iron core?

Q: In her job as a dental hygienist, Kathryn uses a concave

In her job as a dental hygienist, Kathryn uses a concave mirror to see the back of her patient's teeth. When the mirror is 1.20 cm from a tooth, the image is upright and 3.00 times as large as the too...