2. A fixed pulley is driven by a 100 kg mass falling at a rate of 8.0 m in 4.0 s. It lifts a load of 75.0 kgf. Calculate : (a) the power input to the pulley taking the force of gravity on 1 kg as 10 N. et dol (b) the efficiency of the pulley, and (c) the height to which the load is raised in 4.0 s. Ans. (a) 2000 W, (b) 0.75, (c) 8.0 m

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Chapter7: Work And Kinetic Energy
Section: Chapter Questions
Problem 77P: A man of mass 80 kg runs up a flight of stairs 20 m high in 10 s. (a) how much power is used to lift...
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2. A fixed pulley is driven by a 100 kg mass falling at
a rate of 8.0 m in 4.0 s. It lifts a load of 75.0 kgf.
Calculate :
yollug, of ani
bol
(a) the power input to the pulley taking the force of
gravity on 1 kg as 10 N.
of bordi dol
(b) the efficiency of the pulley, and
Spin
01
(c) the height to which the load is raised in 4.0 s.
Ans. (a) 2000 W, (b) 0-75, (c) 8-0 m
QUER
Transcribed Image Text:2. A fixed pulley is driven by a 100 kg mass falling at a rate of 8.0 m in 4.0 s. It lifts a load of 75.0 kgf. Calculate : yollug, of ani bol (a) the power input to the pulley taking the force of gravity on 1 kg as 10 N. of bordi dol (b) the efficiency of the pulley, and Spin 01 (c) the height to which the load is raised in 4.0 s. Ans. (a) 2000 W, (b) 0-75, (c) 8-0 m QUER
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