A plane inclined at 30o to the horizontal has a... - WAEC Physics 2007 Question
A plane inclined at 30o to the horizontal has an efficiency of 50%. Calculate the force parallel to the plane required to push a load of 120N uniformly upn the plane
A
50.0N
B
120.0N
C
200.0N
D
240N
correct option: b
V.R = (\frac{1}{sin\theta} = \frac{1}{sin 30} = 2)
M.A = (\frac{E \times V.R}{100} = \frac{50 \times 2}{100} = 1)
Effort = (\frac{load}{M.A} = \frac{120}{1} = 120N)
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