If you were to take a voyage across the Milky Way, what kind of material would you spend most of your time in?
A) empty space—a pure vacuum
B) dusty molecular clouds
C) star clusters
D) warm, rarefied clouds of atomic hydrogen
E) cool, dense clouds of atomic hydrogen
D
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Which makes central use of the binary system?
A) phonograph records B) DVDs C) both of these D) neither of these
The metric system is preferred over the British system in science for the following main reason
A) The metric system is more precise than the British system. B) Metric quantities can be defined more accurately than the quantities in the British system. C) Metric quantities are natural whereas British quantities are invented. D) Conversions between metric quantities are especially easy because they are all related by factors of ten.
You are moving past the Earth at 0.990c and notice your heart beating 88 beats per minute. (a) If a doctor on Earth measures your heart rate as you zip past, what will the measured rate be? (b) If you had been moving 99
99% the speed of light, what rate would you have observed your heart beats?
An object is oscillating on a spring with a period of 4.60 s. At time t = 0.00 s the object has zero speed and is at x = 8.30 cm. What is the acceleration of the object at t = 2.50 s?
A) 1.33 cm/s2 B) 0.784 cm/s2 C) 11.5 cm/s2 D) 14.9 cm/s2 E) 0.00 cm/s2