A 19.1-kg box is being pushed from the bottom to the top of a frictionless ramp. When the box is pushed at a constant velocity, the nonconservative pushing force does 58.0 J of work. How much work is done by the pushing force when the box starts from rest at the bottom and reaches the top of the same ramp with a speed of 1.50 m/s? Wnc Number i Units

The (non-conservative) force propelling a 1.50 x 10³-kg car up a mountain road does 8.80 x 106 J of work on the car. The car starts from rest at sea level and has a speed of 27.0 m/s at an altitude of 2.10 x 10² m above sea level. Obtain the work done on the car by the combined forces of friction and air resistance, both of which are non-conservative forces. Number i Units

DE REPORT 157% W ab] 4. A4.5 kg sed is pulled across level snow with a force of 225N on a rope that is 35 degrees above the horizontal. If the sled moves 65.3m In 2.5 minutes, how much work does the person do on the sled? How much power is exerted on the sled? The person is pulling as hard as possible on the rope. How else can the amount of work be increased?

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Please answer the foITO 1. T Calculate the work done from x=0 to x = 7 m by the one-dimensional force depicted in the following graph. Suppose that Fo = 68N, calculate the total work by the force over 7 m. % 5 Fo -Fo W= Search 16 1 6 2 17 & 3 Q+ 7 4 5 * 90 Q 6 7 ।ব x (m) f10 >II fn DDI f12 849

A box is pulled 2.0 meters along a rough surface at constant velocity using 100 N of force inclined at 30° above the horizontal.  a. How much work is done by the: gravitational force, normal force, and frictional force?  b. If the force applied, Fa, is doubled but the frictional force remains the same (this is unlikely to occur in practice since Fn changes), will the net work be the same?  c. If Fa is doubled with the frictional force unchanged, how much kinetic energy would the block have after being pulled 2.0 m?

v = 15 ms1 The Smart Car shown in the picture has speed and mass as shown. 860 kg If the driver suddenly applies the brakes and brings the car to a stop in 3.0 s, what is the work done by the friction force between the tires and the road surface? What is the average friction force during the braking action? Suppose the car drives up a hill whose altitude is 16 m above the car's starting point. What is the change in potential energy of the car in going up the hill from its starting point? If the car in the previous problem begins to slide down the ice-covered and (magically) frictionless hill, what will its speed be when it is at an altitude of 8.0 m? e. What will its speed be when it reaches the bottom of the hill?

As a sailboat sails 52 m due north, a breeze exerts a constant force F₁ on the boat's sails. This force is directed at an angle west of due north. A force F2 of the same magnitude directed due north would do the same amount of work on the sailboat over a distance of just 42 m. What is the angle between the direction of F₁ and due north? Number i Units W N S

A force, varying with distance as shown in the graph below, acts on a 5.5 kg object. When is most work done, in the first 4 meters or between 4 and 6 meters? Explain your response. a. 4.0 3.0 2.0 1.0 b. Find the work done by the force in moving the object from 0 m to 6.0 m. Explain your calculation and give units. 2.0 4.0 6.0 8.0 Positien Cr Figure 9-15 Assuming that there is no friction or air resistance what is the total change in the object's energy? Explain your answer. с. kinetic FORCE (N)

A 5.00kg block starts from rest at the top of a 30.0° incline and slides 2.0m down the incline in 1.50s. How much work does gravity do on the block for 1.50s? a. 85J O b. - 85J O c. 98J O d. 49J e. - 49J