Power, Force and Velocity
Q. A man is riding on a cycle with velocity 7.2 km/hr up a hill having a slope 1 in 20. The total mass of the man and cycle is 100 kg. The power of the man is
- 125 W
- 200 W
- 175 W
- 98 W
Q. An engine pump is used to pump a liquid of density ρ continuously through a pipe of cross-sectional area A. If the speed of flow of the liquid in the pipe is v, then the rate at which kinetic energy is being imparted to the liquid is
Q. A hoist operated by an electric motor has a mass of 500 kg. It raises a load of 300 kg vertically at a steady speed of 0.2 m/s. Frictional resistance can be taken to be constant at 1200 N. What is the power required?
- 1.61 kW
- 1.51 kW
- 1.81 kW
- 2.01 kW
Q. A car of 100 HP is moving with a constant velocity of 72 km/hour. The forward force exerted by the engine of the car is
A body is moved along a straight line by a machine delivering constant power.
The distance moved by the body in time t is proportional to