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
Verified Correct Answer: B.
Physical Principles & Numerical Solution
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 = \(\frac{load}{M.A} = \frac{120}{1} = 120N\)
Source: Myschool Past Questions Archive (Record #34864)