Chapter 7 – Work, Energy and Power
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 ?
20
Oct
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 [...]
An engine pumps up 100kg water through a height of 10m in 5s. If efficiency of the engine is 60%. What is the power of the engine? Take g=10ms^2.
20
Oct
An engine pumps up 100kg water through a height of 10m in 5s. If efficiency of the engine is 60%. What is the power of the engine? Take g=10ms^2. An engine pumps up 100kg water through a height of 10m in 5s. If efficiency of the engine is 60%. What is the power of the [...]
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:
20
Oct
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: A man M1 of mass 80kg runs up a staircase in 15s. Another man M2 also of mass 80kg [...]