lecture14_clicker - save her by catching her with his...

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A pitcher throws a 0.15-kg baseball so that it crosses home plate horizontally with a speed of 20 m/s. The ball is hit straight back at the pitcher with a final speed of 22 m/s. What is the impulse delivered to the ball? A. 0.30 kg m/s towards pitcher B. 0.30 kg m/s toward batter C. 6.3 kg m/s toward pitcher D. 6.3 kg m/s toward batter I = P f –P i = m(V f -V i ) = 0.15 (-22 – 20) kg m/s = -6.3 kg m/s Negative means toward pitcher p I r r =
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Find the average force exerted by the bat on the ball if the two are in contact for 2.0 × 10 –3 s. A. 3.1 × 10 3 N towards pitcher B. 3.1 × 10 3 N towards batter C. 6.3 N towards batter D. 6.3 N towards pitcher From last page: impulse delivered to the ball = - 6.3 kg m/s I = F t F = I/ t = -6.3/0.002 N
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Mary Jane falls from a tower. Spiderman tries to
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Unformatted text preview: save her by catching her with his webbing. By the time that the webbing reaches Mary Jane, she is falling at 40 m/s. If the mass of Mary Jane is 50 kg and the webbing stops her motion in 0.5 second, what is the net force on her during this interval? = 50*(0-(-40))/0.5 = 4000 N Quiz (will count for credit) A. 500 N B. 4000 N C. 400 N D. 500 N E. 2000 N t p F = r r Two objects collide head on. Their masses and initial velocities are given. If the 10 kg mass has a final velocity of -0.1 m/s, what is the final velocity of the 1 kg mass? 10 kg 1 m/s 1 kg-1 m/s 10 kg-0.1 m/s 1 kg ? m/s A.-10 m/s B.-1 m/s C. 0.1 m/s D. 10 m/s m 1 v 1i + m 2 v 2i = m 1 v 1f + m 2 v 2f 10 (1) + 1 (-1) = 10 (-0.1) +1 v 2f...
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lecture14_clicker - save her by catching her with his...

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