Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Chapter 3.1, Problem 2bT
The diagrams at right show two identical gliders that move to the right without friction. The hands exert identical, horizontal forces on the gliders. The second glider experiences an additional, smaller force from a massless string held as shown.
Suppose the gliders move through identical displacements.
Is the work done on glider 1 by the hand greater than, less than, or equal to the work done on glider 2 by the hand? Explain.
Is the change in kinetic energy of glider 1 greater than, less than, or equal to the change in kinetic energy of glider 2? Base your answer on your knowledge of the net work done on each object.
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*Draw a diagram and solve number 2 in a clear and detailed solution.
1. A 10 N force is applied to push a 20 N block across a frictionless Surface for a displacement of 5.0 m to the right. What are the forces doing work on the object? What is the amount of work done by each force? How much work is done on the object?2. If the object in problem 1, is set on a surface with a 0.25 coefficient of friction, how much work is done?
Identify which case/s below exhibit/s work done on the object. answer in mathematical computations. Describe the work done in the 3 cases. Why does it matter?
Case 1: Pushing a 5 kg ball cart from a side of the room, neglecting frictional force, all the way across a 5.0 m basketball court.
Case 2: Placing an 8 kg sack of rice on a farmer’s head and bringing it to the nearby dry market, 6 km far from the farm.
Case 3: Lifting a 0.65 kg puppy from the floor to the top of a 0.75 high veterinarian’s surgery table.
Please answer all components of the question:
An amusement park ride uses magnets to accelerate a 500 kg car to an initial speed of 15 m/s. The roller coaster then begins to coast up a hill.
a) What energy conversion takes place as the car goes up the hill? Justify
b) What is the maximum height that the car can attain without receiving additional energy? Show your work.
c) If the car loses 10,000 J of energy to friction, what height will it attain instead? Show your work.
Chapter 3 Solutions
Tutorials in Introductory Physics
Ch. 3.1 - A block is moving to the left on a frictionless,...Ch. 3.1 - In a separate experiment, two hands push...Ch. 3.1 - Shown at right is a side-view diagram of the...Ch. 3.1 - Recall the motion of the block in part B. For each...Ch. 3.1 - Generalize from your answers to pans A—D to...Ch. 3.1 - A glider, glider A, Is pulled by a suing across a...Ch. 3.1 - The diagrams at right show two identical gliders...Ch. 3.1 - A block on a frictionless table is connected to a...Ch. 3.2 - Three students discuss the final momentum and...Ch. 3.2 - Which cart takes longer to travel between the two...
Ch. 3.2 - Use Newton's second law and the definition of...Ch. 3.2 - How does the net work done on cart A(Wnet,A)...Ch. 3.2 - Refer again to the discussion among the three...Ch. 3.2 - Release the ball so that it rolls straight toward...Ch. 3.2 - Release the ball at an angle to the ramp as shown...Ch. 3.2 - How does the direction of the net force on the...Ch. 3.2 - How does the change in kinetic energy of the ball...Ch. 3.2 - For motion 1, draw vector in region II of the...Ch. 3.2 - For motion 2, draw vectors in region II of the...Ch. 3.2 - Consider the change in momentum vectors you...Ch. 3.3 - What differences between gliders M and N could...Ch. 3.3 - For experiment 1,draw and label separate free-body...Ch. 3.3 - In the spaces provided, draw and label vectors to...Ch. 3.3 - A student compares the final speeds of gliders M...Ch. 3.3 - A. Suppose that glider D is free to move and...Ch. 3.3 - A second experiment is performed in which glider D...Ch. 3.3 - Consider the two experiments described above. When...Ch. 3.3 - When the momentum of an object or system of...Ch. 3.3 - Two students the second experiment, in which...Ch. 3.4 - Draw separate free-body diagrams for each block...Ch. 3.4 - Rank the magnitudes of all the horizontal forces...Ch. 3.4 - The velocity vectors for blocks A and B are shown...Ch. 3.4 - Use your knowledge of the velocities and changes...Ch. 3.4 - Draw and label a free-body diagram for system C at...Ch. 3.4 - Write an equation for the momentum of system C in...Ch. 3.4 - Generalize from your results to answer the...Ch. 3.4 - Imagine a single object whose mass is equal to the...Ch. 3.4 - What are the external forces exerted on system C...Ch. 3.4 - The momentum vectors of each block before the...Ch. 3.4 - Draw arrows that represent the direction of the...
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