If we imagine the history of the universe compressed into one year, dinosaurs became extinct ________
A) about an hour ago B) about 6 months ago
C) about 3 weeks ago D) yesterday morning
D
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A person is hearing two sound waves simultaneously. One has a period of 1.50 ms and the other one a period of 1.54 ms. What is the period of the beat due to these two waves?
A) 0.040 ms B) 1.5 ms C) 3.0 ms D) 58 ms E) 330 ms
Momentum is conserved only when there is no friction
Indicate whether the statement is true or false
Two equal mass balls (one blue and the other gold) are dropped from the same height, and rebound off the floor. The blue ball rebounds to a higher position
Which ball is subjected to the greater magnitude impulse during its collision with the floor? A) the gold ball B) Both balls were subjected to the same magnitude impulse. C) It's impossible to tell since the time intervals and forces are unknown. D) the blue ball
Interstellar dust clouds are best observed at what wavelength?
A) visible only B) radio and infrared C) UV and infrared D) radio and X-ray E) visible and UV