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In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.) Correct Answer P = W tan (α + φ)

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In a screw jack, the effort required to lift the load is given by: (where W = Load lifted, α = Helix angle, and φ = Angle of friction) 
In a screw jack, the effort required to lift the load W is given by (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)
The effort required to lift a load W on a screw jack with helix angle $$\alpha $$ and angle of friction $$\varphi $$ is equal to
Which one is incorrect? 1. Kumabaram Lift Canal-Older name - Nohar Sohwa Lift Canal. 2. Kawar sen Lift Canal-Older name - Lunaksar Lift Canal. 3. Panna Lal Lift Canal - Older name - Gajner Lift canal. 4. Veer Tejaji Lift Canal-Older name - Bagdsar.
Two old friends, Jack and Bill, meet after a long time. Jack: Hey, how are you man?
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Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date. Jack: Cool But I still dont know.
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In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.
Five pulleys are arranged in the second system of pulleys. When not loaded the effort required to raise the movable block is 35N. Further wastage in friction increases the pull at the rate of 3% of the load lifted. What is the effort required to raise a load of 2kN?
A screw jack has square threads and the lead angle of the thread is α. The screw jack will be self locking when the coefficient of friction (μ) is
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