A stationary 1.67-kg object is struck by a stick. The object experiences a horizontal force given by F = at - bt2, where t is the time in milliseconds from the instant the stick first contacts the object
If a = 1500 N/(ms) and b = 20 N/(ms)2, what is the speed of the object just after it comes away from the stick at t = 2.74 ms?
A) 3.3 m/s
B) 22 m/s
C) 3.7 m/s
D) 25 m/s
Answer: A
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If you stand closer to a concave mirror than a distance of one focal length, the image you see is
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Based on the figure in the Introduction, and the fact that an object with an increasing moment of inertia will spin more slowly to conserve angular momentum, choose the figure that best depicts how a cloud of gas will collapse to form a star system.
Choose one: A. round clouds, big to little B. horizontal clouds, big to little C. diagonal clouds, big to little