6. If Mariam drags her backpack across the floor by pulling at an angle of 18° above the floor using a force of 27 N to move it 8.5 m across the floor in 9.0 seconds: a) How much work did she do? b) How much power did she use?
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- 5. A person pulls an object of mass 40 kg as far as 20 m above a flat floor at a constant speed. The force used is directed 370 upwards horizontally. The coefficient of kinetic friction of the object with the floor is 0.20. Determine the work by the person, the work by the frictional force, and the total work on the object.3. A 60 kg boy does 60 push-ups in 40 s. With each push-up he must lift an average of 70 % of his mass a height of 40 cm off the floor. Calculate the following: a) the work the boy does for each push-up, assuming he does work only when he pushes up b) the total work done in 40 s c) the power for this periodAn elevator car (shown in the figure below) has a mass of 2000 kg and is carrying passengers having a combined mass of 500 kg. A constant friction force of 2000 N retards its motion. How much power must a motor deliver to lift the elevator car and its passengers at a constant speed of 3.00 m/s? (g= 10 m/s) Motor O a. 81 kW O b. 108 kW O c. 54 kW O d. 27 kW