Two cars are traveling at the same speed and hit the brakes at the same time. Car A decelerates (decreases its velocity) at twice the rate of car B. If car B takes time T to stop, how long does it take car A to stop?
A) 4T
B) 2T
C) T
D) T /2
E) T/4
D
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Interstellar dust scatters _____________light more than _____________light
Fill in the blank(s) with correct word
Two vertical tubes of equal cross-sectional areas are filled with liquids to heights producing atmospheric pressure at their bottoms. One liquid is water and the other is mercury. Both liquids have equal
A) volumes. B) densities. C) weights. D) viscosity. E) none of the above
Humans
A) and primates evolved from a common ancestor B) and primates evolved directly from dinosaurs C) and primates evolved directly from birds D) evolved directly from modern primates
A spaceship approaches Earth with a speed 0.38c. A passenger in the spaceship measures his heartbeat as 72 beats per minute
How many beats per minute are observed in the telemetry radio signals received on Earth? Note that, in addition to time dilation, one must take into account that the signals of successive heartbeats have to travel shorter distances because the spaceship is moving closer (Doppler Effect). A) 75 B) 107 C) 48 D) 100 E) 67