Two planets in space gravitationally attract each other. If the masses of both planets are doubled, with no change in distance between them, gravitational force is
A. twice as much.
B. one-quarter.
C. half as much.
D. four times as much.
Answer: D
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A car has a head-on collision with another car of the same momentum. An identical car driving with the same speed as the first car runs into an enormously massive wall. The greatest impulse will occur on the car that is in the collision with the
A) approaching car. B) wall. C) Both impulses will be the same.
The increasing rate of population growth over the past 50 years is the result of:
a. increasing birth rates in the developed countries b. increasing birth rates in the developing countries c. decreasing mortality rates in the less developed countries d. increasing mortality rates in the less developed countries
How might climate change predictions of sea level in the next century affect the severity of future tsunamis?
What will be an ideal response?
Which of the following location is severely eroding?
A. Miami, FL B. Portland, ME C. San Francisco, CA D. Tampa, FL