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qz4sol_3706Hs11 - a How much work is done on the snowball...

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TA: Tomoyuki Nakayama Tuesday, February 22, 2011 PHY 2048: Physic 1, Discussion Section 3706H Quiz 4 (Homework Set #6) Name: UFID: Formula sheets are not allowed. Do not store equations in your calculator. You have to solve problems on your own; memorizing final algebraic expressions from homework assignments and just plugging numbers into them will not give you full credit. Leave all your work. ________________________________________________________________________________ A 0.500 kg snowball is fired from a cliff 20.0 m high. The snowball's initial velocity is 15.0 m/s, directed 30.0° above the horizontal.
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Unformatted text preview: a) How much work is done on the snowball by the gravitational force during its flight to the flat ground below the cliff? The work done by gravity is W g = -mg(y f – y i ) = mgh = 98.0 J b) What is the kinetic energy of the snowball when it hits the ground? According to the work-kinetic energy theorem, the work done by the net force on an object is equal to the change in kinetic energy of the object. The only force exerted on the snowball during its flight is gravity. The final kinetic energy is ∆ K = W g ⇒ K f = (1/2)mv i 2 + mgh= 154 J...
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