FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Solution
a. 2.6 kJ; b. 640J
54. A 5.0-kg box has an acceleration of 2.0 m/s when it is pulled by a horizontal force across a
surface with Lu =0.50. Find the work done over a distance of 10 cm by (a) the horizontal force,
(b) the frictional force, and (c) the net force. (d) What is the change in kinetic energy of the box?
Solution
a. 3.5 J; b. - 2.5 J; c. 1.0 J; d. 1.O J
60. A 2.0-kg block starts with a speed of 10 m/s at the bottom of a plane inclined at 37° to the
horizontál. The coefficient of sliding friction between the block and plane is 4; = 0.30. (a) Use
the work-energy principle to determine how far the block slides along the plane before
momentarily coming to rest. (b) After stopping, the block slides back down the plane. What is its
speed when it reaches the bottom? (Hint: For the round trip, only the force of friction does work
on the block.)
Solution
a. 6.06 m; b. 6.56 m/s
62. A…
5.16 An elevator cable suspends an elevator car and passengers with a total mass of 550 kg in the Omnicorp
regional headquarters. If the car is being raised at a constant speed of 1.2 m s-1 then:
(a) At what rate is work being done by the cable on the car? The efficiency of the motor at converting electrical
power to mechanical power is just 15%
(b) How much electrical power is being used to raise the car? Budgets are being slashed at Omnicorp and the
amount of power used by elevators has to be reduced by 10%.
Include simple schematic , process digram , and assumption
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