The measured ratio of circumference to diameter on a disk is ? when the disk is
A) moving at relativistic speeds.
B) rapidly rotating.
C) at rest.
D) all of the above
E) none of the above
Answer: C
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A thin layer of oil floats on a water puddle. An observer sees a colored pattern. This happens because
A. water transmits light and never reflects light. B. sunlight's frequency range shifts to infrared at the boundary of water and oil. C. two surfaces each transmit some light and reflect some light. D. oil always does this, even if it is not on water.
The type of EM radiation emitted when high speed electrons decelerate as they are smashed into a metal target is
a. ultraviolet. b. infrared. c. x-ray. d. microwave. e. gamma ray.
An object is located in front of a converging lens with focal length F as shown. The image can be described as
A. upright, magnified, and real.
B. upright, diminished, and virtual.
C. inverted, diminished, and real.
D. inverted, magnified, and virtual.
In twice the time, an object will fall
A) 16 times as far. B) 12 times as far. C) four times as far. D) twice as far. E) eight times as far.