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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 7 - Work, Energy and Power > A pump motor is used to deliver water at a certain rate from a given pipe. To obtain ‘n’ times water from the same pipe in the same time by what amount (a) the force and (b) power of the motor should be increased ?

A pump motor is used to deliver water at a certain rate from a given pipe. To obtain ‘n’ times water from the same pipe in the same time by what amount (a) the force and (b) power of the motor should be increased ?

A man M1 of mass 80kg runs up a staircase in 15s. Another man M2 also of mass 80kg runs up the same staircase in 20s. The ratio of the power development by then will be: