Physics, 23.10.2019 00:00 MayFlowers
Acord of negligible mass runs around two massless, frictionless pulleys. a canister with mass m = 20 kg hangs from one pulley. a constant force f is exerted on the free end of the cord. (a) what magnitude of f is required to lift the canister at constant speed? (b) to lift the canister by 2.0 cm, how far must you pull the free end of the cord? (c) what is the work done on the canister by the tension in the cords attached to the canister? how does this compare to the work you do in pulling down on the cord? (d) what is the work done by the weight of the canister? (e) what is the net work done on the canister? (f) explain why the pulley system offers a mechanical advantage. does it offer an advantage from the viewpoint of energy?
Answers: 1
Physics, 22.06.2019 02:10
"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."
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Physics, 22.06.2019 23:00
The gun from the crime scene shows tool marks where the serial numbers are ground off. there are also tool marks on the bullets left behind. what information can the tool marks on the bullets and gun provide about the crime? what type of evidence does this information provide, individual or class?
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Acord of negligible mass runs around two massless, frictionless pulleys. a canister with mass m = 20...
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