If the net work W is done on an object is negative, the object's kinetic energy increases by an amount W
Indicate whether the statement is true or false
FALSE
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Venus may have started with an ocean's worth of water. If so, where is its water now?
A) The original water remains vaporized in the atmosphere due to Venus's intense heat. B) Most of the water is frozen beneath the surface. C) Most of the water combined with rocks in chemical reactions. D) The water was lost when ultraviolet light broke apart water molecules and the hydrogen escaped to space. E) The water changed to carbon dioxide through chemical reactions.
Telescope A has a mirror twice the diameter of telescope B's mirror. How does A's light-gathering power compare to B's?
A. A gathers 1/4th as much light as B does. B. A gathers 4 times the light that B does. C. A gathers 1/2 the light that B does. D. A gathers twice the light that B does.
Generally speaking, activity on the surface of the Sun is primarily driven by
A. electromagnetism. B. gravity. C. nuclear reactions. D. thermodynamics.
The gush of steam that issues from the escape valve of a pressure cooker is relatively cool
A) close to the opening. B) above the opening where vapor is visible. C) both of these D) none of the above