An object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors
A) Both vectors point in the same direction.
B) The vectors point in opposite directions.
C) The vectors are perpendicular to each other.
D) The acceleration is zero but the velocity is constant.
C
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Assume a gram of a substance marketed as "Pure Energy" is annihilated by a gram of a second substance "Anti-Pure Energy." How long would the energy released power a city which uses 109 watts of power?
a. 40 hrs b. 25 hrs c. 50 hrs d. 65 hrs e. 50000 hrs
Light in a frozen block of ice reflects off the ice-air interface and undergoes a phase shift of
A) 0°. B) 45°. C) 90°. D) 180°. E) 270°.
Ignoring air resistance, the velocity of a falling object
A. is constant B. increases for a while, then becomes constant. C. depends on the mass of the object. D. is constantly increasing
The energy source at the center of our galaxy
a. is not visible at optical wavelengths. b. produces X-rays. c. must be less than 10 AU in diameter. d. all of the above e. none of the above.