m) A system of pulleys has four pulleys in fixed block and three in movable block. It is able to
lift a weight 45 kg with an effort of 20 kg. find its efficiency. Ans: [32.14 %)
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hey mate
here is the answer ..
Answer:
velocity ratio(v.r)=the number of pulleys used
=7
mechanical advantage(m.a)=load/effort
=45/20
=2.25
also,
we know that
m.a=efficiency %*v.r/100
=>efficiency %=m.a/v.r*1/100
=>efficiency %=2.25/7*1/100
=>efficiency %=32.1428%
lena37:
A crow bar lifts a weight 40kgf by means of an effort of 10kgf. If the load is situated at a distance of 0.25 m from the fulcrum, find the length of the bar. Answer is 1.25 m
???
ok
by principle of lever, load *load arm=effort*effort arm
40*0.25=10*effort arm
effort arm=1 m
thus, the length of the bar=load arm+effort arm
=0.25+1=1.25 m
thank u so much
welcome
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