Questions from College Physics

Q: In a thunderstorm, charge is separated through a complicated mechanism that

In a thunderstorm, charge is separated through a complicated mechanism that is ultimately powered by the Sun. A simplified model of the charge in a thundercloud represents the positive charge accumula...

Q: Two metal spheres of the same radius R are given charges of

Two metal spheres of the same radius R are given charges of equal magnitude and opposite sign. No other charges are nearby. Sketch the electric field lines when the center-to-center distance between t...

Q: (a) Find the equivalent resistance between terminals A and B

(a) Find the equivalent resistance between terminals A and B to replace all of the resistors in the diagram. (b) What current flows through the emf? (c) What is the current through the 4.00 â&...

Q: Two plane mirrors form a 70.0° angle as shown

Two plane mirrors form a 70.0° angle as shown. For what angle θ is the final ray horizontal?

Q: Verify that the SI unit of impulse is the same as the

Verify that the SI unit of impulse is the same as the SI unit of momentum.

Q: The filament of an incandescent lightbulb is made of tungsten. At

The filament of an incandescent lightbulb is made of tungsten. At room temperature of 20.0°C the filament has a resistance of 10.0 Ω. (a) What is the power dissipated in the lightbulb immediately afte...

Q: (a) Find the number of water molecules in 1.

(a) Find the number of water molecules in 1.00 L of water. (b) What fraction of the liter’s volume is occupied by water nuclei?

Q: A stereo system whose amplifier can produce 60 W per channel is

A stereo system whose amplifier can produce 60 W per channel is replaced by one rated 120 W per channel. Would you expect the new stereo to be able to play twice as loudly as the old one? Explain.

Q: Choose two rays in Fig. 23.7 and use them

Choose two rays in Fig. 23.7 and use them to prove that the angle of incidence is equal to the angle of reflection. [Hint: Choose a wavefront at two different times, one before reflection and one aft...

Q: Sketch a ray diagram to show that if an object is placed

Sketch a ray diagram to show that if an object is placed less than the focal length from a converging lens, the image is virtual and upright.