The presence of gases such as carbon dioxide and water vapor in a planet's atmosphere is direct evidence of _________ in a planet's history.
a. high surface temperatures
b. volcanic activity
c. cometary impacts
d. a lack of asteroid impacts
e. the greenhouse effect
b. volcanic activity
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Potential of Point-Charges: The potential (relative to infinity) at the midpoint of a square is 3.0 V when a point charge of +Q is located at one of the corners of the square. What is the potential (relative to infinity) at the center when each of the other corners is also contains a point charge of +Q?
A. 0 V B. 3.0 V C. 9.0 V D. 12 V
One way to increase the resolving power of a telescope is to
A. make its mirror smaller. B. make its mirror bigger. C. observe objects using longer wavelengths. D. replace its mirror with a lens of the same diameter.
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down
A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration point downward. E) Neither velocity nor acceleration can be determined without additional information.