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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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
Physics & Space Science
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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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