1174338499

# 1174338499 - HW Chapter 5 5.15 Atwoods Machine. A 15.0-kg...

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HW Chapter 5 5.15 Atwood’s Machine . A 15.0-kg load of bricks hangs from one end of a rope that passes over a small, frictionless pulley. A 28.0-kg counterweight is suspended from the other end of the rope, as shown in Fig. 5.47. The system is released from rest. a) Draw two free-body diagrams, one for the load of bricks and one for the counterweight. b) What is the magnitude of the upward acceleration of the load of bricks? c) What is the tension in the rope while the load is moving? How does the tension compare to the weight of the load of bricks? To the weight of the counterweight? Fig. 5.47 5.19 Apparent weight . A 550-N physics student stands on the bathroom scale in an elevator. As the elevator starts moving, the scale reads 450 N. a) Find the acceleration of the elevator (magnitude and direction). b) What is the acceleration if the scale reads 670 N? c) If the scale reads zero, should the student worry? Explain. 5.25 In a physics lab experiment, a 6.00-kg box is pushed across a flat table by a

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## This note was uploaded on 09/08/2008 for the course PHYS 4A taught by Professor D.v during the Spring '07 term at Evergreen Valley.

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1174338499 - HW Chapter 5 5.15 Atwoods Machine. A 15.0-kg...

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