A 2-kg rifle is horizontally suspended by a pair of strings so that recoil can be measured. The rifle fires a 0.001-kg bullet at a speed of 200 m/s. The recoil velocity of the rifle is about
A) 0.001 m/s.
B) 0.01 m/s.
C) 0.1 m/s.
D) 1 m/s.
E) none of the above
Answer: C
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A charge of 40 pC is distributed on an isolated spherical conductor that has a 4.0-cm radius. Point A is 1.0 cm from the center of the conductor and point B is 5.0 cm from the center of the conductor. Determine the electric potential difference VA?VB.
A. +1.8 V B. +29 V C. +27 V D. +7.2 V E. +9.0 V
A 3000-N bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
A) 30 N. B) 300 N. C) 3000 N. D) more than 3000 N.
A light ray, traveling obliquely to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflection, this ray
A) travels parallel to the mirror's axis. B) travels at right angles to the mirror's axis. C) passes through the mirror's center of curvature. D) passes through the mirror's focal point. E) passes through the axis midway between the mirror's focal point and center of curvature.
The bending of light because of a speed change as it moves from one medium to another is called
a. diffraction. b. refraction. c. reflection. d. the Doppler effect.