The factional torque for square thread at the mean radius r while rais

1.	The factional torque for square thread at the mean radius r while raising load W is given by
A.	T = W.r tan(≈ì√ú - ≈í¬±)
B.	T = W.r tan(≈ì√ú + ≈í¬±)
C.	T = W.r tan≈í¬±
D.	T = W.r tan≈ì√ú
Answer» C. T = W.r tan≈í¬±

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The factional torque for square thread at the mean radius r while raising load W is given by

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