Power

Water falls from a height of m at a rate of kg/s to operate a turbine. The losses due to frictional forces are % of energy. How much power is generated by the turbine? ( m/s²)
1. kW
2. kW
3. kW
4. kW

An engine pumps water continuously through a hose. Water leaves the hose with a velocity and is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?
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2.
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4.

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 ms^-1. The mass per unit length of water in the pipe is $100$ $kg$ $m^{-1}.$What is the power of the engine?

1. 400 W

2. 200 W

3. 100 W

4. 800 W

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? $\left(g=10\right)$ $m/s^2$

1.	12.3 kW	2.	7.0 kW
3.	10.2 kW	4.	8.1 kW

The energy that will be ideally radiated by a transmitter in is:

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3.		4.

An electric lift with a maximum load of kg (lift+passengers) is moving up with a constant speed of ms^–1. The frictional force opposing the motion is N. The minimum power delivered by the motor to the lift in watts is: (Take ms^–2)

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3.		4.

At any instant of time the displacement of any particle is given by (SI unit) under the influence of the force of The value of instantaneous power (in SI units) is:

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3.		4.