Conservation of Momentum: Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. What is their separation after the heavier astronaut has moved 12 m?
A. 9.0 m
B. 16 m
C. 21 m
D. 24 m
E. 28 m
Answer: E
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Free Fall: To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge? Neglect air resistance.
A. 10 m B. 14 m C. 26 m D. 32 m E. 52 m
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The acceleration of the ball in m/s2 is
a. 0. b. 4.9. c. 9.8. d. 19.6. e. none of these.
The distribution of Population II stars and globular clusters shows the Galaxy was more ________ in shape when it formed than it is now
Fill in the blank(s) with correct word
The ozone layer causes a temperature increase in the
a. thermosphere. b. mesosphere. c. troposphere. d. stratosphere.