6. Several friends use a simple rope and pulleyto raise a tree house from the ground into a tree.The mass of the tree house is 150 kg. By pullingtogether, the friends manage to exert an averageforce of 1.6x10’N as they raise the tree house adistance of 3.2 m above the ground.a) Find the work done in raising the tree house.b) How much “useful work" is done?c) What is the efficiency of the rope and pulleyin raising the tree house?

Name: 6. Several friends use a simple rope and pulleyto raise a tree house
Uploaded: 2024-03-20T06:57:25.000Z
Channel: Bartleby
Description: 6. Several friends use a simple rope and pulleyto raise a tree house from the ground into a tree.The mass of the tree house is 150 kg. By pullingtogether, the friends manage to exert an averageforce of 1.6x10’N as they raise the tree house adistance

Given: M=150 kgF=1.6*103 Nh=3.2 m

Science

Physics

б. friends use a simple rope and pulley to raise a tree house from the ground into a tree. The mass of the tree house is 150 kg. By pulling together, the friends manage to exert an average force of 1.6×10’N as they raise the tree house a distance of 3.2 m above the ground. a) Find the work done in raising the tree house. b) How much “useful work" is done? c) What is the efficiency of the rope and pulley in raising the tree house?

б. friends use a simple rope and pulley to raise a tree house from the ground into a tree. The mass of the tree house is 150 kg. By pulling together, the friends manage to exert an average force of 1.6×10’N as they raise the tree house a distance of 3.2 m above the ground. a) Find the work done in raising the tree house. b) How much “useful work" is done? c) What is the efficiency of the rope and pulley in raising the tree house?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter5: Energy

Section: Chapter Questions

Problem 7P: A tension force of 175 N inclined at 20.0 above the horizontal is used to pull a 40.0-kg packing...

See similar textbooks

Similar questions

Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.
Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.
(a) How long will it take an 850-kg car with a useful power output of 40.0 hp (1hp=746W) to reach a speed of 15.0 m/s, neglecting friction? (b) How long will this acceleration take if the car also climbs a 3.00-m-high hill in the process?
A student expends 7.5 W of power in lifting a textbook 0.50 m in 1.0 s with a constant velocity. (a) How much work is done, and (b) how much does the book weigh (in newtons)? The answers to Confidence Exercises may be found at the back of the book.
a shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 below the horizontal. The force is just sufficient to overcome various frictional forces, so the cart moves at constant speed, (a) Find the work done by the shopper as she moves down a 50.0-m length aisle, (b) What is the net work done on the cart? Why? (c) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the work done by frictional forces doesnt change, would the shoppers applied force be larger, smaller, or the same? What about the work done on the cart by the shopper?
A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0° below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the gravitational force? (c) What is the work done on the cart by the shopper? (d) Find the force the shopper exerts, using energy considerations. (e) What is the total work done on the cart?
(a) What is the average useful power output of a person who does 6.00106 J of useful work in 8.00 h? (b) Working at this rate, how long will it take this person to lift 2000 kg of bricks 1.50 m to a platform? (Work done to lift his body can be omitted because it is not considered useful output here.)
Describe a situation in which a force is exerted for a long time but does no work. Explain.
A tension force of 175 N inclined at 20.0 above the horizontal is used to pull a 40.0-kg packing crate a distance of 6.00 m on a rough surface. If the crate moves at a constant speed, find (a) the work done by the tension force and (b) the coefficient of kinetic friction between the crate and surface.
“ E=K+Uconstant is a special case of the work energy theorem.” Discuss this statement.
Calculate the power output needed for a 950-kg car to climb a 2.00 slope at a constant 30.0 m/s while encountering wind resistance and friction totaling 600 N.
The force acting on a panicle varies as shown in Figure la P7.14. Find the work done by the force on the particle as it moves (a) from x = 0 to x = 8.00 m. (b) from x = 8.00 m to x = 10.0 m, and (c) from x = 0 to x = 10.0 m.