lecture24_notes - A ball of mass m attached to a string of...

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A ball of mass m, attached to a string of length L, is released from rest at angle θ 0 and then strikes a standing wooden block. Is the block more likely to tip over if the ball bounces off of the block or if the ball doesn't bounce? A. Bounces B. Doesn't bounce C. Equally likely in both cases m L v = 0 o θ o
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Applications of Momentum Conservation in Propulsion 234 Th 238 U Alpha Decay 4 He v 1 v 2 Guns, Cannons, etc.: Radioactive decay:
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Rockets:
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"Professor Goddard does not know the relation between action and reaction and the need to have something better than a vacuum against which to react. He seems to lack the basic knowledge ladled out daily in high schools." New York Times editorial, 1921 , about Robert Goddard's revolutionary rocket work . " Correction: It is now definitely established that a rocket can function in a vaccuum. The 'Times' regrets the error." New York Times editorial, July 1969 .
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Cephalopods (Squid, Ocotopi, Cuttlefish):
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Shock Absorbers: Impulse J = F dt = F av t = p Reduce F av , F max by making t of collision longer.
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