Integrated Science
Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 3, Problem 2PEB

How much work is done by a hammer that exerts a 980.0 N force on a nail, driving it 1.50 cm into a board?

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A telephone pole support cable is in the way of some construction workers. In order for the work to proceed, the cable must be moved 2 meters closer to the pole. If the pole is 10 meters tall and the cable is currently fastened to the ground 8 meters from the pole, how much will the workers need to cut off from the cable when they move it?
A high jumper, falling at 4.0 m/s, lands on a foam pit and comes to rest, compressing the pit 0.40 m. If thepit is able to exert an average force of 1200 N on the high jumper in breaking the fall, what is the jumper'smass? (60 kg)
Two identical, thin boards are hinged together at an end as shown below. The length of each board is l, and the total mass of each is m. Initially, one board hangs down freely from the hinge while the other is held at angle 00 by a horizontal string. Ignore any friction. (a.) Find the string's tension. Answer: "mg tan 00 (b.) If the string is broken, what is the incoming board's kinetic energy Ko just before impact? Answer: mgl (1 – cos 60) 2 (c.) Find the incoming board's angular momentum L just before impact. Make use of Eqn. (2) to minimize the algebra. Answer: L2 = m²gl® (1 – cos 0) (d.) Show that the kinetic energy of both boards just after the impact is Ko/2. Assume the collision is completely inelastic. Hint: Apply Eqn. (2) to minimize the algebra. (e.) To what angle do the boards rise after the collision? Answer: arccos (3/4 + 1/4 cos 00)

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