Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Textbook Question
Chapter 3.1, Problem 1aT
A block is moving to the left on a frictionless, horizontal table. A hand exerts a constant horizontal force on the block.
1. Suppose that the work done on the arrows at right to show the direction of the displacement of the block and thedirection of the force by the hand.
Explain how you chose the direction of the force on the block by the hand.
Is the block speeding up, slowing down, or moving with constant speed? Explain.
2. Suppose that the block again moves to the left but now the work done by the hand is negative. In the space at right,draw arrows to represent the direction of the displacement of the block and the direction of the force by the hand.
Explain how you chose the direction of the force on the block by the hand.
Is the block speeding up, slowing down, or moving with constant speed? Explain.
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Students have asked these similar questions
Choose the correct answer:
1. We can distinguish three simple cases of action of a force and the work it does on a system:
A. When the force acts in the same direction and sense as the displacement, the work it does is positive (W> 0)
B. When the force acts in the same direction, but in the opposite direction to the displacement, the work that performs has a negative value (W <0)
C. When the force acts in a direction perpendicular to the displacement, it does no work (W = 0)
2. An example of negative work is:
A. Stop a ball.
B. Push a car
C. Walking with the backpack on the back
If you start from A and move along the curvature through B,C and D and back to A as indicated.
Explain how will you estimate the work done and whether the work is done onto the system by the surroundings or done by the system onto the surroundings
I would only like part d), e), and f) answered.
The total mass of the roller coaster is 650 kg. Use the measurements shown in the image and your knowledge of conservation of energy to answer the following questions.
a) If it takes a force of 3943 N [parallel to the track] to pull the roller coaster up to point A, and it is pulled along 105 m of track, find the work done on the roller coaster.
b) Find the total energy the roller coaster has at point A if it is at rest for a brief moment before it starts to go down the hill.
c) According to the Law of Conservation of Energy, what will the total energy of the roller coaster be at points B and C?
d) Use the Law of Conservation of Energy to find the speed of the roller coaster at point B.
e) If it takes the motor 20.0 s to pull the roller coaster to point A, find the power of the motor.
f) In real life, some of the energy the roller coaster has at point A will be lost as thermal energy due to friction as it travels through the track. If…
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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