Number 6 A rock climber wears a 7.50-kg knapsack while scaling a cliff. After 30.0 min, the climber is 8.2 mtoabove the starting point.a. How much work does the climber do on the knapsack?= 8.29- 9.8b. If the climber weighs 645 N, how much work does she do lifting herself and the knapsack(7.50 (8-2)C9.8)Is mgd645X82-578つ 5て8う2ので.7-2891-с.What is the ayerage power developed by the climber?18604. An electric motor develops 65kW of power as it lifts a loaded elevator 17.5 m in 35.OS How much35(6500017.5force does the motor exert?EdEA force of 300 N is used to push 1,145-kg mass 30.0 m horizontally in 3.00sa. Calculate the work done on the mass.b. Calculate the power.6.Robin pushes a wheelbarrow by exerting a 145-N force horizontally. Robin moves it 60.0 m at aconstant velocity in 25.0s.a. What power does Robin develop?b. If Robin moves the wheelbarrow twice as fast, how much power is developed?

Answered: Image /qna-images/answer/18c1ea6b-f9ce-46c2-841e-57f4bcda8d7c.jpg

6. Robin pushes a wheelbarrow by exerting a 145-N force horizontally. Robin moves it 60.0 m at a constant velocity in 25.0s. What power does Robin develop? a. b. If Robin moves the wheelbarrow twice as fast, how much power is developed?

6. Robin pushes a wheelbarrow by exerting a 145-N force horizontally. Robin moves it 60.0 m at a constant velocity in 25.0s. What power does Robin develop? a. b. If Robin moves the wheelbarrow twice as fast, how much power is developed?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 7PE: A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N...

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Concept explainers

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

Question

Number 6

A rock climber wears a 7.50-kg knapsack while scaling a cliff. After 30.0 min, the climber is 8.2 m
to
above the starting point.
a. How much work does the climber do on the knapsack?
= 8.2
9- 9.8
b. If the climber weighs 645 N, how much work does she do lifting herself and the knapsack
(7.50 (8-2)C9.8)
Is mgd
645X82-578つ 5て8う2ので.7-2891-
с.
What is the ayerage power developed by the climber?
1860
4. An electric motor develops 65kW of power as it lifts a loaded elevator 17.5 m in 35.OS How much
35(65000
17.5
force does the motor exert?
Ed
E
A force of 300 N is used to push 1,145-kg mass 30.0 m horizontally in 3.00s
a. Calculate the work done on the mass.
b. Calculate the power.
6.
Robin pushes a wheelbarrow by exerting a 145-N force horizontally. Robin moves it 60.0 m at a
constant velocity in 25.0s.
a. What power does Robin develop?
b. If Robin moves the wheelbarrow twice as fast, how much power is developed?

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