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What is B in the equation T2 = T1e^µB ?

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What is B in the equation T2 = T1e^µB ?

(a) Angle of the belt to surface contact in radians

(b) Angle of the belt to surface contact in degrees

(c) Angle of the belt in radians

(d) Angle of the belt in degrees

The question was posed to me in examination.

The above asked question is from Frictional Forces on Flat Belts topic in portion Friction of Engineering Mechanics

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Correct answer is (a) Angle of the belt to surface contact in radians

To explain I would say: For solving of the unknown tension in the belts, T2  = T1e^µB equation is used. In this, the R.H.S tension is the maximum tension of the two tensions. While the other one is the smaller one. And the µ is coefficient of friction between the belt and the surface. And the B is the angle of belt to the surface in radians.

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