You shine a beam of monochromatic light from Earth to an astronaut friend in orbit. The light your friend receives, relative to light from an equivalent source on the spaceship, is slightly
A) slower in speed.
B) higher in speed.
C) neither of these
Answer: C
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A person approaches a plane mirror at a speed of 2 m/s. How fast does he approach his image?
A) 1 m/s B) 2 m/s C) 3 m/s D) 4 m/s E) 1 m/s
As the speed of an object increases, its relativistic momentum:
a. stays the same as its classical momentum. b. increases more than its classical momentum. c. increases less than it classical momentum. d. does not change since momentum is a conserved quantity.
A catcher arranges to catch a baseball dropped from a height 50 m above his glove. However, his friends substitute a soft 250 g red grapefruit, so that it will smash apart when he catches it. His glove stops the grapefruit in 0.010 s. What force does the glove exert on the grapefruit?
a. 0.078 3 N b. 783 N c. 2 450 N d. 24 500 N e. 78 300 N
Two equal magnitude forces are in opposite directions, and their lines of action are separated by distance d. These two forces are applied to a solid disk, which is mounted on a frictionless axle. If d is half the radius r of the disk, which of the following positions for the forces would give the most torque?
a. One force on a line touching the circumference of the disk and the other on a line halfway to the center. b. One force on a line at a distance d from the center and the other on a line through the center of the disk. c. One force on a line at a distance d/2 from the center of the disk and the other on a line at a distance d/2 on the opposite side of the center of the disk. d. Since all the above orientations give the same torque, choose this answer.