An object is placed 10 cm from a convex lens of focal length 20 cm. What is the magnification?
A)
0.50
B)
1.0
C)
1.5
D)
2.0
E)
2.5
D
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Collisions in Two Dimensions: Two dogs, Rover and Fido, run on a level frictionless surface. Rover runs eastward with a momentum of 24 kg . m/s, and Fido runs northward with momentum 10 kg . m/s. They make a sudden perfectly inelastic collision. What is the magnitude of their combined momentum after the collision?
A. 14 kg . m/s B. 26 kg . m/s C. 34 kg . m/s D. It cannot be determined without knowing the masses and velocities of the dogs.
Sound: You drop a stone down a well that is 9.5 m deep. How long is it before you hear the splash? The speed of sound in air is 343 m/s and air resistance is negligible.
A. 1.2 s B. 1.3 s C. 1.4 s D. 1.5 s E. 1.6 s
Why are smaller terrestrial bodies such as Mercury or the Moon “geologically dead”?
a. They cooled off faster than Earth did. b. They don’t have erosion. c. They were hit by fewer meteorites than Earth. d. They are made of different materials than Earth.
The torque on the rotating loop of wire in a DC motor ________ as the loop rotates
A) is inversely proportional to the current B) is constant in magnitude C) varies in magnitude D) is zero