Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
K.E = `1/2` mv2
K.E = `1/2`(2) (20)2
or K.E = 400 J
Thus K.E is 400J
APPEARS IN
संबंधित प्रश्न
Define 1 joule of energy.
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
Name the physical quantity whose MKS units are kgm2s-3.
Give an example
Electrical energy changes to heat energy.
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
