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 3.2, Problem 2cT
How does the direction of the net force on the ball in motion 2 compare to the direction of the net force on the ball in motion 1? Explain.
Is the direction of the acceleration of the ball in motion 2 consistent with the fact that the ball speeds up and its trajectory curves? Explain.
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Show your solutions.
1. A total distance of travel of 2,000 km breaks every 200 km of a pattern of East-South-East-South continuously up to the end. The time of travel was recorded 5 hours. Find the average velocity of the travel and neglect the turning impact.
a. 240 kph
b. 300 kph
c. 350 kph
d. 400 kph
e. 440 kph
2. Which of the following is correct if a helicopter flies from the same origin, what will be its average velocity in an hour travel?
a. 1,212.20 kph
b. 1,500 kph
c. 1,000 kph
d. 1,414.20 kph
e. 800 kph
Please explain the following:
1.When you apply a constant force to an object does the object move at a constant
velocity or does its velocity increase? Explain why this occurs using your understanding of
acceleration/force (gravity).
2. When you increase the applied force, what happens to the acceleration of the object?
Explain.
3. As the mass increases, what happens to the amount of force needed to begin moving
the object? Explain.
4. Do you need to continue applying force on an object to keep it moving? Explain why.
Forces and Newton's Laws:
The picture shows a motion diagram. The dots represent the object's position at moments separated by equal intervals of time. The dots are connected by arrows representing the object's average velocity during the corresponding time interval.
Question: Which of these situations (in the picture) describe the motion shown in the motion diagram at point C?
My answer was I and J because the net force at point C is down, and in I and J the object is dropped so the only force on it is the force of gravity, and the net force is down. But my answer was wrong and the correct answer is G. Why is it the correct answer?
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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