As shown in the figure a person is pulling a mass 'm' from ground on a fixed rough hemispherical surface - Physics - Work Energy And Power

Question

As shown in the figure a person is pulling a mass 'm' from ground
on a fixed rough hemispherical surface upto the top of the
hemisphere with the help of a light inextensible string Find the
work done ( in Joules ) by tension in the string if radius of
hemisphere is R and friction coefficient is μ Assume that the
block is pulled with negligible velocity ( take μ = 0 1, m = 1
kg, g = 10 m/s2, R = 1 m )

Ravi Gupta · Accepted Answer

Dear Student
Kindly find the answer of your asked query

Work against the gravitatioanl force w1= mgh here heigh h will be equal to the top surface of the hemisphere which is equal to R
w1 = mgRfirctional force will be = μ×normal reaction= μmgwork done by the frictional force = w2= μmgRtotal work done = W = W1+w2= mgR+μmgR=(1+μ)mgR

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