Planet A has twice the mass of Planet B. From this information, what can we conclude about the free-fall acceleration at the surface of Planet A compared to that at the surface of Planet B?
A) The free-fall acceleration on Planet A must be twice as great as the free-fall acceleration on Planet B.
B) The free-fall acceleration on Planet A must be four times as great as the free-fall acceleration on Planet B.
C) The free-fall acceleration on Planet A is the same as the free-fall acceleration on Planet B.
D) The free-fall acceleration on Planet A is greater than the free-fall acceleration on Planet B, but we cannot say how much greater.
E) We cannot conclude anything about the free-fall acceleration on Planet A without knowing the radii of the two planets.
E
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A 10 kg object has a moment of inertia of 1.25 kg 
If a torque of 2.5 N•m is applied to the object, the angular acceleration is
A. 10 
B. 8.0
C. 6.0
D. 4.0
E. 2.0
Pour two liters of water at 40°C into one liter of water at 20°C and the final temperature of the two becomes
A) less than 30°C. B) at or about 30°C. C) more than 30°C.
Which of the following is a contribution to astronomy made by Galileo?
A) The astronomical telescope can show us far more detail than the eye can. B) Jupiter has four moons orbiting it. C) The Moon has craters, mountain, valleys, and dark flat areas on its surface. D) Venus appears almost fully lit when it lies on the far side of the Sun. E) all of the above
Electrical charges and magnetic poles have many similarities, but one difference is:
a. a magnetic pole cannot be isolated. b. one magnetic pole cannot create magnetic poles in other materials. c. opposite magnetic poles repel. d. magnetic poles do not produce magnetic fields.