An archer pulls her bow string back 0.40 m by exerting a force that increases uniformly from zero to 240 N. What is the equivalent spring constant of the bow, and how much work is done in pulling the bow?
600 N/m, 48 J
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Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still in the atmosphere, we breathe in at least one of them each
A) single breath. B) day. C) month. D) ten years. E) can't say for some people breathe a few of Caesar's atoms daily, while others never.
Overall, Jupiter's composition is most like that of
A) the Sun. B) Earth. C) a comet. D) an asteroid.
Conservation of angular momentum means that a spinning body tends to:
A) fly apart. B) slow down. C) wobble into an eccentric orbit. D) gravitationally collapse. E) keep spinning.
Titan is roughly the same size as Mercury, yet Titan has an atmosphere while Mercury does not. How can this be?
A) Although Titan is roughly the same size as Mercury, it is much denser, making its gravitational field stronger B) Unlike Mercury, Titan is constantly being bombarded by icy comets that evaporate and maintain its atmosphere C) On its surface, Titan has volcanism that is constantly replenishing its atmosphere while Mercury does not D) Even though Titan's gravity is weak, it is much colder, allowing molecules to be trapped in its atmosphere