Heena Sharma, Shubhankat Vats and, Rashmi Gupta Solutions for Chapter: Work and Energy, Exercise 5: CHAPTER EXERCISE

When water is flowing through a pipe, then its velocity changes by $5\%$find the change in percentage, in the power water.

A boy of mass$50 \mathrm{kg}$ runs up a staircase of $50$steps in $10 \mathrm{s}$. if the height of each step is $15 \mathrm{cm}$, then find the his power. (take$,\mathrm{g}=10{\mathrm{ms}}^{-2}$)

A geyser of$2.5 \mathrm{kw}$ is used for $6 \mathrm{h}$ daily. Calculate the cost of electricity consumed in $10 \mathrm{days}.$ Electricity rate per unit$₹ 4.$

What do you understand by the term “transformation of energy?” explain with an example.

Explain the transformation of energy in the following case.

A ball thrown upwards

Explain the transformation of energy in the following case.
A stone dropped from the roof of a building 
 

A ball thrown vertically upwards returns to the thrower. How do the kinetic energy (KE) and potential energy (PE) of the ball change?

Calculate the power of pump which lifts $100 \mathrm{kg}$ of water to a water tank placed at a height of $20 \mathrm{m}$in $10 \mathrm{s}$.(take,$\mathrm{g}=10{\mathrm{ms}}^{-2}$)