Showing 211 to 220 of 400 Questions
  • Force of B Baseball Swing A baseball has mass 0.145 kg. (a) If the velocity of a pitched ball has a magnitude of 45.0 m/s and the batted ball's velocity is 55.0 m/s in the opposite direction, find the magnitude of the change in momentum of the ball and of the impulse applied to it by the bat. (b) If the ball remains in contact with th

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    341
  • Force of B Golf Swing A 0.0450-kg golf ball initially at rest is given a speed of 25.0 m/s when a club strikes. If the club and ball are in contact for 2.00 ms, what average force acts on the ball? Is the effect of the ball's weight during the time of contact significant? Why or why not?

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    726
  • Hockey puck B rests on a smooth ice surface and is struck by a second puck A, which has the same mass. Puck A is initially traveling at 15.0 m/s and is deflected 25.00 from its initial direction. Assume that the collision is perfectly elastic. Find the final speed of each puck and the direction of B's velocity after the collision. [Hint:

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    743
  • If a 150-lb crate is released from rest at A, determine its speed after it slides 30 ft down the plane. The coefficient of kinetic friction between the crate and plane is μ* = 0.3,

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    186
  • If a particle has an initial velocity vO = 12 ft/s to the right, and a constant acceleration of 2 ft/s2 to the left, determine the particle’s displacement in 10 s. Originally sO = 0.

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    169
  • If disk A is sliding along the tangent to dist B and strikes B with a velocity v, determine the velocity of B after the collision and compute the loss of kinetic energy during the collision. Neglect friction. Disk B is originally at rest. The coefficient of restitution is e, and each disk has the same size and mass m.

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    141
  • If it takes 35s for the 50-Mg tugboat to increase its speed uniformly to 25 km/h, starting from rest, determine the force of the rope on the tugboat. The propeller provides the propulsion force F winch gives the tugboat forward motion, whereas the barge moves freely. Also, determine F acting on the tugboat. The barge has a mass of 75 mg.

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    346
  • If the end of the cable at A is pulled down with a speed of 2 m/s, determine the speed at which block B rises.

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    546
  • If the girl throws the ball with a horizontal velocity of 8 ft/s, determine the distance d so that the ball bounces once on the smooth surface and then lands in the cup at C. take e = 0.8

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    422
  • If two disks A and B have the same mass and are subjected to direct central impact such that the collision is perfectly elastic (e = 1), prove that the kinetic energy before collision equals the kinetic energy after collision. The surface upon which they slide is smooth

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    208
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