Frequent Work Energy Power Questions

A sphere of mass m held at a height 2R between a wedge of same mass and a rigid wall,is released from rest.Assuming all the surfaces are frictionless.Find the speed of both the bodies when the sphere hits the ground *Image* ...

A stone is projected with a velocity u such that it reaches height h. Find the ratio of its kinetic energy and potential energy when it is at a height 3h/4 from the ground. (potential energy is zero at the point of projection ...

A pump draws water from a tank and issues it from the end of a horse which is 2.5m vertically above the level from which the water is drawn. The cross sectional area of the hose is 10cm^{2} , and the water leaves the end of t ...

A force vec{F}=2hat{i}-3hat{j}+4hat{k} (N) acts on a particle which undergoes a displacement vec{r}=7hat{i}+3hat{j}-2hat{k} (M). Calculate the work done by the force a) 37 J b) -9 J c) 49 J d) 14 J ...

 A work of 4900j is done on road of mass 50 kg to lift it to a certain height. Calculate the height through which the load is lifted. a) 10 b) 20 c) 30 d) none ...

Work done by a body in lifting a block upto a height 7 is a) positive b) negative c) zero d) none ...

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At time t=0 string A is cut, then what will be the maximum compression in the spring if spring constant is K.(Assume surfaces are smooth and initially spring was at its natural length) *Image* ...

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*Image* Answer this question with logical explanation please. ...

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There will be an increase in potential energy of the system, if work is done upon the system by ...

A particle moves from position {{ar{r}}_{1}}=3hat{i}+2hat{j}-6hat{k} to position {{ar{r}}_{2}}=14hat{i}+13hat{j}+9hat{k} under the action of force 4hat{i}+hat{j}+3hat{k},N . The work done will be ...

A particle of mass 1 gm executes an oscillatory motion on a concave surface of radius of curvature 2m. If the particle starts its motion from a point at a height of 1 cm from the horizontal and the coefficient of friction is ...

A force overrightarrow{F,}=-K(yhat{i}+xhat{j}) (where K is a positive constant) acts on a particle moving in the xy-plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a, 0) and then ...

A stone tied to a string of length L is whirled in a vertical circle with the other end of string at the centre. At a certain instant of time the stone is at it lowest position and has a speed u. The magnitude of change in ve ...