A diver shines an underwater searchlight at the surface of a pond (n = 1.33). At what angle (relative to the surface) will the light be totally reflected?
a. 47.3°
b. 41.2°
c. 51.1°
d. 58.7°
e. 49.8°
B
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When you throw a ball, the work you do to accelerate it equals the kinetic energy the ball gains. If you do twice as much work when throwing the ball, does it go twice as fast?
a) Yes. Twice as much work will give the ball twice as much kinetic energy. Since KE is proportional to the speed, the speed will double as well. b) Yes. Twice as much work will give the ball four times as much kinetic energy. Since KE is proportional to the speed squared, the speed will be the square root of 4, or twice as fast. c) No. Twice as much work will give the ball twice as much kinetic energy. But since KE is proportional to the speed squared, the speed will be ?2 times larger. d) No. Twice as much work will give the ball four times as much kinetic energy. Since KE is proportional to the speed, the speed will be four times larger.
A hollow conducting sphere of radius 12 cm had a charge of 18
C placed on it. What is the potential at the surface of the sphere?
A. 0 V
B. 24 V
C. 
D. 
E. 
A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is
a. 0 b. 5 m/s2. c. 9.8 m/s2. d. 10 m/s2. e. 20 m/s2.
Pure elements can be transformed into entirely different elements by
A) radioactive decay. B) transmutation. C) both of these D) neither of these