
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A jet flights with a speed of 282 m/s. If the jet’s engine has a power of 1,829,680 W, what is the air resistance?
Calculate answer to one decimal.
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- A 1000 kg car changes its velocity from 10 m/s to 24 m/s in 8 s. Calculate the work and power of the engine.arrow_forwardA man pushes a lawn mower on a level lawn with a force of 206 N. If 31% of this force is directed forward, how much power does he expend in pushing the mower 7.3 m in 10 s?arrow_forwardA man pushes a lawn mower on a level lawn with a force of 189 N. If 28% of this force is directed forward, how much power does he expend in pushing the mower 5.5 m in 16 s?arrow_forward
- A weight lifter raises a 80 kg barbell to a height of 2.4 m. what is the barbell's potential energy? Calculate answer to one decimal.arrow_forwardPlease answer question 12 and provide all work needed.arrow_forwardYou lift a 2N rock by 4 m, in 2 seconds. How much work did you do? 8 J 6 J O 12 J O 16 Jarrow_forward
- A man is pulling a sled (m-120 Kg) across the snowy tundra (see the figure below) by applying a force of 210 N at an angle of 9-18° with respect to the ground. He pulls the sled over a distance of 100 m. The sled started from rest and reached a final velocity of 6.8 m/s. How much work is done by the man on the sled measured in kJ? (1kJ = 1000J)arrow_forwardA demolished car weighing 15,000 N is picked up by an electromagnet on a crane in a junkyard. It lifts the car 10 meters in 4 seconds. What is the output power rating of the crane? The correct answer is 37,500 W.arrow_forwardIf a 100 W electric motor has an efficiency of 68%, how long will it take to lift a 40kg object to a height of 8m?arrow_forward
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