Power = Work `xx` Time taken to do the work.

150 workers were engaged to finish a piece of work in a certain number of days. Four workers dropped from the work on the second day. Four workers dropped on third day and so on. It took 8 more days to finish the work. Find the number of days in which the work was completed. [Let the no.of days to finish the work is 'r' then 150 x = (x+8)/2 [2 xx 150 + (x+8-1)(-4)]

A body is falling from height 'h' it takes t_(1) time to rech the ground. The time taken to cover the first half of height is:-

Define work

The work done by a force F_1 is larger than the work done by another force F_2 . Is it neccesary that power delivered by F_1 is also larger than that of F_2 ? Why

Formulate the following problems as a pair of equations and hence find their solutions: 2 women and 5 men can together finish an embroidery work in 4 days, while 3 women and 6 men can finish it in 3 days. Find the time taken by 1 woman alone to finish the work, and also that taken by 1 man alone.

Being a punctual man, the lift operator of a skyscraper hung an exact pendulum clock on the lift wall to know the end of the working day. The lift moves with an upward and downward accelerations during the same time (according to a stationary clock), the magnitudes of the accelerations remaining unchanged. Will the operator finish his working day in time, or will he work more (less) than required?

A paricle performs S.H.M. with time period T . The time taken by the particle to move from half the amplitude to the maximum dispalcement is

By increasing the volume of water coming out per second the water pump to n times , what is the power of motor has to be increases ?