ACTIVITY 4: DECODE THE MESSAGE Directions: Determine the work done by the force on a given system in the following problems. Then, decode the message. E How much work is done by the force? A How much work is done by a shopper in pushing her distance of 7.9 m under the grocery cart by a force of action of a constant force of 32.0 N through a distance of 5.6 N. How much work is 4.5 m? JA 4.0 kg object moves a done on the object? Diplacement E You pull your bag with a MA crate is being lifted M You must exert a force of force of 30 N parallel to the into a truck. If it is moved 4.5 N on a book to slide it ground classroom 20 m away. How 3650 J of work is done, then J of work in the process, much work will you do on how far is the crate being how far have you moved the your bag? towards your with a 2470 N force and across a table. If you do 2.7 lifted? book? S A porter pulls a 10-kg luggage along a level road for 5 m by exerting a force of 20 N at angle of 30° with the horizontal shoulder through a vertical distance of 1.5 m and carries it for another 5 m. How much work does he do in: (c) carrying the luggage on his shoulder? (a) pulling; (b) lifting; 44.24 J 0.60 m 144 J 147 J 600 J 86.60 J OJ 1.48 m 10.50 J

ACTIVITY 4: DECODE THE MESSAGE Directions: Determine the work done by the force on a given system in the following problems. Then, decode the message. E How much work is done by the force? A How much work is done by a shopper in pushing her distance of 7.9 m under the grocery cart by a force of action of a constant force of 32.0 N through a distance of 5.6 N. How much work is 4.5 m? JA 4.0 kg object moves a done on the object? Diplacement E You pull your bag with a MA crate is being lifted M You must exert a force of force of 30 N parallel to the into a truck. If it is moved 4.5 N on a book to slide it ground classroom 20 m away. How 3650 J of work is done, then J of work in the process, much work will you do on how far is the crate being how far have you moved the your bag? towards your with a 2470 N force and across a table. If you do 2.7 lifted? book? S A porter pulls a 10-kg luggage along a level road for 5 m by exerting a force of 20 N at angle of 30° with the horizontal shoulder through a vertical distance of 1.5 m and carries it for another 5 m. How much work does he do in: (c) carrying the luggage on his shoulder? (a) pulling; (b) lifting; 44.24 J 0.60 m 144 J 147 J 600 J 86.60 J OJ 1.48 m 10.50 J

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 29P: A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N...

See similar textbooks

Similar questions

Two forces act to double the speed of a particle, initially moving with kinetic energy of 1 J. One of the forces does 4 J of work. How much work does the other force do?
“ E=K+Uconstant is a special case of the work energy theorem.” Discuss this statement.
A 5.0-kg box has an acceleration of 2.0m/s2 when it is pulled by a horizontal force across a surface with K=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?
(a) What is the average useful power output of a person who does 6.00106J 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.)
Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a 60.00 slope at constant speed, as shown below. The coefficient of friction between the sled and the snow is 0.100. (a) How much work is done by fiction as the sled moves 30.0 m along the hill? (b) How much work is done by the rope on the sled in this distance? (c) What is the work done by the gravitational force on the sled? (d) What is the total work done?
A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time: (a) How many people ‘would it take to nm a 4.O0-kW electric clothes dryer? (b) How many people would it take to replace a large electric power plant that generates 800 MW?
A cart is pulled a distance D on a flat, horizontal surface by a constant farce F that acts at an angle with the horizontal direction. The other forces on the object during this time are gravity (Fw) , normal forces (FN1) and (FN2) , and rolling frictions Fr1 and Fr2 , as shown below What is the work done by each force?
Give an example of something we think of as work in everyday circumstances that is not work in the scientific sense. Is energy transferred or changed in form in your example? If so, explain how this is accomplished without doing work.
An archer pulls her bowstring back 0.400 m by exerting a force that increases uniformly from zero to 230 N. (a) What is the equivalent spring constant of the bow? (b) How much work does the archer do on the string in drawing the bow?
A particle of mass 2.0 kg moves under the influence of the force F(x)=(5x2=7x)N . Suppose a frictional force also acts on the particle. If the particle’s speed when it starts at x=4.0 m is 0.0 m/s and when it arrives at x=4.0 m is 9.0 m/s, how much work is done on it by the frictional force between x=4.0 m and x=4.0 m?
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.Oc 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?
Suppose you throw a ball upward and catch it when it returns at the same height. How much work does the gravitational force do on the ball over its entire trip?