Determining baseball momentum
A cardinal (Richmondena cardinalis) of mass 4.20×10-2 kg and a baseball of mass 0.150 kg have the same kinetic energy. What is the ratio of the cardinal's magnitude p_c of momentum to the magnitude p_b of the baseball's momentum?
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Estimate the force on a 145-gram baseball if it hits the bat at 50 miles per hour and stays in contact with the bat for 0.1 second, during which time it reverses direction.
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How close (measured horizontally) can the shark approach before the seagull can see it clearly? Assume the refractive index of the water is 1.335.
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