On his way off to college, Russell drags his suitcase 15.0 m from the door of his house to the car at a constant speed with horizontal force of 95.0 N. How much work does Russell do to overcome the force of friction? * Use g=9.8

Choose all the correct statement that applies to Work.   A. Work is the product of force and distance.   B. Work is a vector quantity.   C. Work is a scalar quantity.   D. work has magnitude only.

Two children have identical spring-loaded catapults, which contain springs with spring constant k. If Samir compresses the spring in his catapult by a distance x and Mona compresses hers by a distance 2x, how does the work they have done to compress their catapults compare? A. Mona has done 2 times as much work as Samir. B. Samir has done 2 times as much work as Mona. C. They have done the same amount of work. D. Mona has done 4 times as much work as Samir.

5. Mark and David are loading identical cement blocks onto David's pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp on massless, frictionless rollers. Which statement is true? A. Mark does more work than David B. Mark and David do the same amount of work C. David does more work than Mark D. None of these statements is neces sarily true because the angle of the incline is unknown E. None of these statements is neces sarily true because the mass of one block is not given 6. A worker pushes a wheelbarrow 5.0 m along a level surface, exerting a constant horizontal force of 50.0 N. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow? A. 250 J B. 215 J C. 35 J D. 15 J E. 45 J 7. An athlete jumping vertically on a trampoline leaves the surface with a velocity of 8.5 m/s upward. What maximum height does she reach?A. 13 m B. 2.3 m C. 3.7…

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19. Using a rope, you pull a large 150 kg sled while accelerating at 0.2 m/s² across a horizontal (level) but icy surface. For a coefficient of kinetic friction between the sled an ice is 0.1. Calculate the total work when pulling the sled, a distance of 10 m. a. b. 30 Joules 300 Joules C. 1500 Joules d. 1800 Joules e. None of these are correct

1. A constant 15 N horizontal force is applied to a 15 kg cart at rest on a level floor. If friction is negligible, what is the speed of the cart after it has gone 8.0 m? Think and Prepare 1. You are going to use the Work-Energy Theorem for this problem 2. How will you figure out the change in KE of the cart? 3. How will you figure out the work done by the force? Enter to 2 significant figures Speed after 8 m = m/s