The diagram shown represents a block-and-tackle pulley sy...
The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?
A.
28.0
B.
48.0N
C.
233.0N
D.
50.0N
Correct answer is D
Given Data:
Efficiency = 40% Load = 120N, V.R = 6 (Number of Pulleys)
Efficiency = M.AV.R∗100
40 = M.A6∗100
6 * 40 = 100 M.A
M.A = 240100 → 2.4
Where M.A = LoadEffort
2.4 = 120Effort
: Effort = 1202.4 → 50N