A heavy block at rest is suspended by a vertical rope. When the block is raised at constant velocity, the rope tension
A) is less than its weight.
B) equals its weight.
C) is greater than its weight.
Answer: B
Physics & Space Science
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Consider a two-body system of the Earth orbiting the Sun. The center of mass would be located near the _________
a. Sun b. Earth c. Moon d. midway point
Physics & Space Science
Due to inertia, perhaps a railroad train in motion should continue moving indefinitely when its engine is turned off. This is not observed because railroad trains
A) aren't massive enough. B) are too heavy. C) ride on straight tracks. D) encounter opposing forces.
Physics & Space Science
What is degenerate matter?
What will be an ideal response?
Physics & Space Science
When an atom undergoes a "quantum jump" into a lower-energy state, the atom
A) emits a photon. B) absorbs an electron. C) absorbs a photon. D) emits an electron. E) None of the above.
Physics & Space Science