A bucket of cement is raised by a rope at constant speed at a construction site. Compared with the force of gravity on the bucket, the upward force supplied by the rope is
A) greater.
B) equal.
C) less.
Answer: B
Physics & Space Science
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The gravitational field at the earth due to the moon is (the mass of the moon is 
kg and separated by a distance of 
A. 
B. 
C. 
D. 
E. 
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What is the percentage of Earth's atmosphere (by volume) that is carbon dioxide (CO2)?
A) 78 B) 21 C) 3 D) 0.9 E) 0.03
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Emission nebulae are created by gas absorbing ultraviolet energy from the hot young stars within them, such as in the Orion Nebula
Indicate whether the statement is true or false
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A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the magnitude of the change in the momentum of the ball during the rebound?
A) 72 kg ? m/s B) 4.4 kg ? m/s C) 1.8 kg ? m/s D) 5.4 kg ? m/s E) 1.2 kg ? m/s
Physics & Space Science