If air resistance can be ignored, which of the following graphs will be a straight line for a falling object?
A. Distance travelled versus velocity
B. Velocity versus time
C. Velocity versus distance travelled
D. Distance travelled versus time
E. Time versus distance travelled
Answer: B
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a. a mirror b. a lens c. your eye. d. a light bucket
A piece of wire 15 m long is cooled from 40°C to –9°C and the change in length is –12.7 mm.
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a. 23 Hz b. 9 kHz c. 3100 Hz d. All of these