The wheel has weight W. The minimum value of F required to pull the wheel up the step is -
Text Solution
Verified by ExpertsThe correct answer is:
A
F cos α – N cos θ = 0
⇒ F cos α = N cos θ
N sin θ + F sin α – W = 0
⇒ N sin θ = F sin α – W
F cos α tan θ = F sin α – W
F (sin α – cos α tan θ ) = W
F = 
F = 
F is minimum when
α – θ = 90 0 α = 90
0 + θ
F min = W cos θ
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