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(Solved by Expert Tutors) a) Assume there is no air friction. A ball of mass m = 6.99 kg is>


dropped from a height h = 5.45 m. It hits the ground, losing energy ?E = 1/16 of its total energy in the collision. How high will the ball bounce upward before it comes momentarily to rest? m b) Water is at rest at the bottom of a well of depth h = 7.41 m. A pump lifts mass at a rate of dm/dt = 124 kg/minute from the well and ejects it with a speed v = 3.21. m/s. If there is no friction anywhere, find P, the power (energy per time) needed to do this work. W c) A projectile of mass m = 8.76 kg is fired straight upward twice, both times at initial speed vo = 57.8 m/s. The first time there is no air friction, and the projectile reaches height ho; the second time the air dissipates Elost = 3936 J of energy as the projectile rises, and it rises to height h. Find ho - h, the difference betwen the height the projectile reaches without friction and the height it reaches with friction. m d) A uniform chain has mass m = 5.28 kg and length L = 7.17 m. It is held on a frictionless table with L/11 hanging over the edge. Find the work needed to pull the haning part back onto the table.

 

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Apr 19, 2020

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