College Physics: A Strategic Approach (3rd Edition)

3rd Edition

ISBN: 9780321879721

Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field

Publisher: PEARSON

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Newton's Second Law

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Textbook Question

Chapter 4, Problem 30P

Problems 30 through 38 describe a situation. For each problem, identify all the forces acting on the object and draw a free-body diagram of the object.

30. Your car is sitting in the parking lot.

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Chapter 4, Problem 29P

Chapter 4, Problem 31P

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Problem 3: You need to push a box across carpet. The box and its contents have a mass of 75 kg. The coefficients of static friction and kinetic friction between the box and the carpet are 0.60 and 0.40, respectively. A. You push horizontally on the box with a force of 300 N. Draw a free-body diagram for this scenario. What is the magnitude of all the individual forces that act on the box? B. You now push horizontally on the box with constant force of 500 N. Draw a free body diagram that clearly labels each force. Calculate the magnitude of each individual force that acts on the box. C. What is the net force and acceleration for the box while you push with the 500 N?

A woman who weighs 602 N sits on a chair with her feet on the floor and her arms resting on the chair’s armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25.0 N on her arms. The seat of the chair exerts an upward force of 500 N. a. What force does the floor exert on her feet? Enter your answer as positive for upward direction and negative for downward direction. asnwer in N b. What force does the floor exert on the chair? Enter your answer as positive for upward direction and negative for downward direction. answer in N c. Consider the woman and the chair to be a single system. Let the subscripts be the following: s = woman and chair system, e = Earth, f = floor. Choose the correct FBD for this system that includes only the external forces acting on it. (OPTIONS ATTACHED)

A 15 kg object rests on a table. A cord is attached to this object and also to a wall. Another object is hung from this cord as shown. The coefficient of static friction between the 15 kg object and the table is 0.27. a) Draw the free body diagram. b) Find the maximum mass that can be hung, without movement.

Chapter 4 Solutions

College Physics: A Strategic Approach (3rd Edition)

Ch. 4 - If an object is not moving, does that mean that...Ch. 4 - An object moves in a straight line at a constant...Ch. 4 - If you know all of the forces acting on a moving...Ch. 4 - Three arrows are shot horizontally. They have left...Ch. 4 - A carpenter wishes to tighten the heavy head of...Ch. 4 - Internal injuries in vehicular acci-dents may be...Ch. 4 - Heres a great everyday use of the physics...Ch. 4 - Suppose you are an astronaut in deep space, far...Ch. 4 - Jonathan accelerates away from a stop sign. His...Ch. 4 - Normally, jet engines push air out the back of the...

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