A movie projector is equipped with a 0.5-meter focal length lens that is positioned 0.506 meters from the film.  (a) How far from the lens must the screen be if the image on it is to be in focus on the screen? (b) How many times larger is the image than the object?

The deviation from the way a compass needle points from the true north direction is the magnetic declination.

A magnetic field exerts a force on an electric charge if the charge is

A source emits sound at a fixed constant frequency f. If the source moves away from you, the frequency you hear is lower than f.

You can see your image in a mirror because of

Two charged bodies separated by a distance d exert a repulsive electrical force on each other. The signs of the charges on the two bodies might be __________. (Select all that apply.)

Two charged bodies separated by a distance d exert a repulsive electrical force on each other. The signs of the charges on the two bodies might be __________. (Select all that apply.)

An echo is a sound wave that has been

The advantage of a convex mirror is that it has a __________ field of view.

Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed of the water ripples? (Type your final answer with units in the box below. Show your equation and work on your scratch paper, or include it in the box below.)