Multiple ChoiceYou pull a 5kg box vertically up with a constant 100N force for 2m. How much work do you do?135472Has a video solution.
Multiple ChoiceYou push a 3kg box against a wall for a distance of 2m with a force of 40N that makes a 53° angle with the horizontal, as shown. Calculate the work done by gravity.100395Has a video solution.
Multiple ChoiceA 1000kg pallet of bricks is being lowered to the ground by a crane. If the bricks are moving at a constant speed, how much work is done by the cable on the bricks as they descend 11m?129
Multiple ChoiceA particle of mass 250g moving along the x axis has velocity vx=(7.6x3)m/s with x measured in m. How much work is done on the particle as it moves from x=0.0m to x=2.0m?114
Textbook QuestionA factory worker pushes a 30.0-kg crate a distance of 4.5 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.25. (e) What is the total work done on the crate?236Has a video solution.
Textbook QuestionTwo tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.80×106N, one 14° west of north and the other 14° east of north, as they pull the tanker 0.75 km toward the north. What is the total work they do on the supertanker?591Has a video solution.
Textbook QuestionA factory worker pushes a 30.0-kg crate a distance of 4.5 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.25. (d) How much work is done on the crate by the normal force? By gravity?11161Has a video solution.
Textbook QuestionA factory worker pushes a 30.0-kg crate a distance of 4.5 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.25.(b) How much work is done on the crate by this force?10031Has a video solution.
Textbook QuestionA factory worker pushes a 30.0-kg crate a distance of 4.5 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.25. (a) What magnitude of force must the worker apply?1148Has a video solution.
Textbook QuestionA factory worker pushes a 30.0-kg crate a distance of 4.5 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.25. (c) How much work is done on the crate by friction?221Has a video solution.
Textbook QuestionA 25 kg air compressor is dragged up a rough incline from r₁ (→ above r)= (1.3î + 1.3ĵ) m to r₂ (→ above r) = (8.3î + 2.9ĵ) m, to where the y-axis is vertical. How much work does gravity do on the compressor during this displacement?100Has a video solution.
Textbook QuestionThe energy used to pump liquids and gases through pipes is a significant fraction of the total energy consumption in the United States. Consider a small volume V of a liquid that has density p. Assume that the fluid is nonviscous so that friction with the pipe walls can be neglected. (a) An upward-pushing force from a pump lifts this volume of fluid a height h at constant speed. How much work does the pump do?59Has a video solution.
Textbook QuestionA 1000 kg elevator accelerates upward at 1.0 m/s² for 10 m, starting from rest. (b) How much work does the tension in the elevator cable do on the elevator?53Has a video solution.
