A person is pulling a mass m=2kg slowly from ground on a fixed rough hemispherical surface upto the top of the hemisphere with the help of a light inextensible string. If the work done by the person is 10z joules, then find z.[R=1m and u = 0.5. (g = 10m/s2)] u=0.5 R=lm

As shown in the figure ,a person is pulling a mass 2kg from ground on fixed rough surface upto the top of surface with the help of a light inextensible string. The work done in joule by tension in the string is 10x,if height of the surface is 1m from ground, length of base of the surface is 2.5m and friction coefficient is 0.4. Find the value of x. Assume that the block is pulled with negligible velocity . (assume g=10 SI units)

A person lifts a parcel of mass 20 kg 1.5 m up from the ground and puts it in a truck. Find What is the work done by the force ?

A block of mass 4kg is released from the top of a rough inclines plane of height 10 m . If velocity of the block is 10 m/s at the bottom of the inclined then work done by the friction force on the block will be

A body of mass 2 kg is dropped from rest from a height 20 m from the surface of Earth. The body hiys the ground with velocity 10 m/s, then work done (g=10m//s^(2))

A person of mass 40 kg picked up a bag of mangoes and climbed ten steps . If the bag contains ten mangoes , each of mass 0.5 kg and the height of each step is 10 cm , then find the work done by the person in carrying that till tenth step (Take g = 10 m s^(-2) ).

A person holds on a weight of 10 kg at a height of 5m above the ground for 5 minutes. Work done by him is

A block of mass 100kg is kept on a horizontal rough surface. A man of mass 60kg is trying to pull the block with the help of ideal inextensible string. Find the minimum tension ( approximately ) in string to pull the block so that man remains at rest . Coefficient of friction between block and horizontal surface is 0.2 and that between man an horizontal surface is 0.5 ( g = 10 m//s^(2) )

Two uneqal masses of 1 kg and 2 kg are attached at the two ends of a light inextensible string passing over a smooth pulley as shown . If the system is released from rest, find the work done by string on both the blocks in 1 s. (Take g= 10 m//s^2 ).