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Stretching a spring A spring of spring constant k 5 500.0 N/m sits on a horizontal surface with one end attached to a wall. (a) How much work is done by the spring as you stretch its free end by 10.0 cm? (b) From the point where the spring is already stretched by 10.0 cm, how much work would be done by the spring if you stretched it by another 10.0 cm? (c) Is the work done in part (b) equal to the work done in part (a)? (d) How much work does the spring do as you compress it from the equilibrium position by 10.0 cm? (e) How does this compare to the answer in part (a)?
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Electrical Engineering
Negative Work In a strong-person contest, a car with a mass of 1.20 × 103 kg rolls toward a contestant at a speed of 0.800 m/s. The contestant pushes against the car with a constant force (Figure 6-19) and brings it to a stop over a distance of 0.500 m. Determine the work done by the contestant on the car. Find the magnitude of the force exerted by the contestant.
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Electrical Engineering
Negative Work In a strong-person contest, a car with a mass of 1.20 × 103 kg rolls toward a contestant at a speed of 0.800 m/s. The contestant pushes against the car with a constant force (Figure 6-19) and brings it to a stop over a distance of 0.500 m. Determine the work done by the contestant on the car. Find the magnitude of the force exerted by the contestant.
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Electrical Engineering
Work done by the Force of gravity A skier slides down a ski slope that makes an angle of u with respect to the horizontal direction, as shown in Figure 6-20. The initial position of the skier is at a vertical height h above the base of the slope, and the skier starts from rest. Ignoring frictional forces, determine the work done on the skier by all the forces and calculate the skier’s speed at the bottom of the slope. The total mass of the skier and the skis is m, and for this example the skier can be considered as a point particle.
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Electrical Engineering
Collision with a spring
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Electrical Engineering
Work done by a Variable Force
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Electrical Engineering
Slapshot
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Electrical Engineering
Coefficient of kinetic Friction A box of mass 123 kg, initially at rest on a horizontal surface, is pushed in a straight line with a constant force (F ⃗)of magnitude 560 N over a distance of 7.0 m. Over this distance, the speed of the box changes from zero to 4.0 m/s. The frictional force between the box and the surface cannot be ignored. Determine the coefficient of kinetic friction between the box and the surface.
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Electrical Engineering
