Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
Given mass m = 1000 kg
velocity v = 72 km/hr = 20 m/s
Now K.E = `1/2` mv2 = `1/2` (1000)(20)2
or,K.E = 2 x 105 J
APPEARS IN
संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
The moon is revolving around the earth in a circular path. How much work is done by the moon?
Explain degradation of energy by taking two examples of your daily life.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
The work done on an object does not depend on ______.
Name the CGS unit of work.
Give an example
Chemical energy changes to heat energy.
