Questions from College Physics

Q: Good lenses used in cameras and other optical devices are actually compound

Good lenses used in cameras and other optical devices are actually compound lenses made of several lenses put together to minimize aberrations. Suppose a converging lens with a focal length of 4.00 cm...

Q: (a) Using Fig. 3.26, estimate Damon’s

(a) Using Fig. 3.26, estimate Damon’s acceleration at t = 2.0 s. (b) Estimate his average velocity between t = 0 and t = 10.0 s.

Q: A camera has a telephoto lens of 240 mm focal length.

A camera has a telephoto lens of 240 mm focal length. The lens can be moved in and out a distance of 16 mm from the image sensor by rotating the lens barrel. If the lens can focus objects at infinity,...

Q: A tennis ball (mass 57.0 g) moves toward

A tennis ball (mass 57.0 g) moves toward the player’s racquet at 47.5 m/s. It is in contact with the racquet for 3.60 ms, after which it moves in the opposite direction at 50.2 m/s. What is the averag...

Q: You have two lenses of focal lengths 25.0 cm and

You have two lenses of focal lengths 25.0 cm and 5.0 cm. (a) To build an astronomical telescope that gives an angular magnification of 5.0, how should you use the lenses (which for objective and whic...

Q: Draw a motion diagram and sketch graphs of x(t),

Draw a motion diagram and sketch graphs of x(t), vx(t), and ax(t) for a sprinter running a short race on a straight track, from just before the start of the race until the sprinter has stopped after f...

Q: A slide projector has a projection lens of 10.0 cm

A slide projector has a projection lens of 10.0 cm focal length, and the screen is located 2.5 m from the projector. (a) What is the distance between the slide and the projection lens? (b) What is t...

Q: In a binary star system, two stars orbit their common center

In a binary star system, two stars orbit their common center of mass. In one such system, star A has 4.0 times the mass of star B. (a) Draw and label vector arrows for the gravitational forces that e...

Q: A slide projector, using slides of width 5.08 cm

A slide projector, using slides of width 5.08 cm, produces an image that is 2.00 m wide on a screen 3.50 m away. What is the focal length of the projector lens?

Q: When a steel cable supports a heavy load of weight W,

When a steel cable supports a heavy load of weight W, its length increases by an amount ΔL compared with its length without a load. Suppose the cable is cut into three equal pieces, and the three resu...