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(II) (*a*) How much work is done by the horizontal force *F*_{p}=150N on the 18-kg block of Fig. 7–29 when the force pushes the block 5.0 m up along the 32° frictionless incline? (*b*) How much the work is done by the gravitational force on the block during this displacement? (*c*) How much work is done by the normal force? (*d*) What is the speed of the block (assume that it is zero initially) after this displacement? [*Hint:* Work-energy involoves *net* work done.]

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# Chapter 7 Solutions

EBK PHYSICS FOR SCIENTISTS & ENGINEERS

# Additional Science Textbook Solutions

The Cosmic Perspective (8th Edition)

College Physics: A Strategic Approach (4th Edition)

Conceptual Physics (12th Edition)

College Physics

Sears And Zemansky's University Physics With Modern Physics

Conceptual Physical Science (6th Edition)

- 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?
*arrow_forward*Check Your Understanding Find the work done by the same force in Example 7.4 over a cubic path, y=(0.25m-2)x3 , between the same points A=(0,0) and B=(2m,2m) .*arrow_forward*A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?*arrow_forward* - Suppose you are jogging at constant velocity. Are you doing any work on the environment and vice versa?
*arrow_forward*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?*arrow_forward*Cite two examples in which a force is exerted on an object without doing any work on the object.*arrow_forward* - A particle of mass 2.0 kg moves under the influence of the force F(x)=(3/x)N. If its speed at x=2.0 m is v=6.0 m/s, what is its speed at x = 7.0 m?
*arrow_forward*Check Your Understanding The spring Example 7.5 is compressed 6 cm from its equilibrium length. (a) Does the spring force do positive or negative work and (b) what is the magnitude?*arrow_forward*A baseball of mass 0.25 kg is hit at home plate with a speed of 40 m/s. When it lands in a seat in the left-field bleachers a horizontal distance 120 m from home plate, it is moving at 30 m/s. If the ball lands 20 m above the spot where it was hit, how much work is done on it by air resistance?*arrow_forward* - Check Your Understanding What potential energy U(x) can you substitute in Equation 8.13 that will result in motion with constant velocity of 2 m/s for a particle of mass 1 kg and mechanical energy 1 J?
*arrow_forward*Can the power expended by a force be negative?*arrow_forward*A 500-kg dragster accelerates from rest to a final speed of 110 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower if this takes 7.30s?*arrow_forward*

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