If you pound a feather with a hammer, on which one is a greater force exerted?
A) always the feather
B) always the hammer
C) The magnitude of the force is always exactly the same on both of them.
D) If the feather moves, then the greater force was exerted on it. Otherwise forces of the same magnitude were exerted on both.
C
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The coldest region of the atmosphere is the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
Energy Conservation With Conservative Forces: A 60-kg skier pushes off the top of a frictionless hill with an initial speed of 4.0 m/s. How fast will she be moving after dropping 10 m in elevation? Air resistance is negligible.
A. 0.20 km/s B. 15 m/s C. 10 m/s D. 0.15 km/s E. 49 m/s
The vast flood deposits prove Mars once had much running water. What happened to it?
What will be an ideal response?
Which of the following could be the reason that Mars has only a thin atmosphere?
A. The atmosphere is spread over a very large area. B. The gravitational pull from Earth caused Mars to lose some of its atmosphere. C. The gravity on Mars was insufficient to hold a thick atmosphere and hence the gases in the atmosphere escaped over time. D. All of the above. E. None of the above