On a calm day with no wind, you can run a 1500-m race at a velocity of 4.0 m/s. If you run the same race on a day when you have a constant headwind that slows your speed by 2.0 m/s, how much time would it take you to finish the race?
A) 250 s
B) 750 s
C) 1125 s
D) 9000 s
B
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The energy radiated by a typical quasar requires that its black hole accrete about:
A) one solar mass a century. B) one solar mass a decade. C) one solar mass a year. D) ten solar masses a year. E) one solar mass a day.
The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. What is the change in mechanical energy done on the system during this time interval by the frictional force on the 2.0 kg mass?
A. ?12 J B. ?17 J C. ?20 J D. ?8.0 J E. ?28 J
Weight and g: In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter. Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2)
A. 2.4 × 1019 kg B. 4.8 × 1019 kg C. 1.2 × 1020 kg D. 2.4 × 1020 kg E. 4.8 × 1020 kg
A "gravitational slingshot" enables a spacecraft to
A) speed up. B) slow down. C) change direction. D) A and B only E) A, B, and C