A pulley system is rigged for a 4:1 advantage. If the system is 85% efficient, how much force is needed to pick up a 200-lbs box?
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A pulley system is rigged for a 4:1 advantage. If the system is 85% efficient, how much force is needed to pick up a 200-lbs box?
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- Suppose the 480 lbs pile driver that drops 20 ft drives the pile 2.0 in. every time it strikes the pile. What is the average resisting force of the ground where the pile is driven?Consider a box, of mass 5 kg, being pushed along a horizonal surface a distance of 2.9 m in 16.2 seconds. The applied force is 165.7 N and is directed at an angle 0.7 radians as shown in the diagram below. What is the power exerted while moving the object?45. Suppose a person uses a mechanical jack to lift one half the weight of a car with a mass of 1200 kg. During each stroke of the jack handle, the person’s hand is pushing for a distance of 40.0 cm but the car is lifted only 5.0 mm. (a) Assuming the jack is 100% efficient, how much force must the person exert on the handle as the car is lifted? (b) If the actual amount of force required on the handle is 90.0 N, what is the actual efficiency of the jack?
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