Advertisements
Advertisements
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 donkey is carrying a load on its back.
उत्तर
- While carrying a load, the donkey has to apply a force in the upward direction. But the displacement of the load is in the forward direction.
- Since displacement is perpendicular to force, the work done is zero.
APPEARS IN
संबंधित प्रश्न
When do we say that work is done?
An electron emitter must have _____________ work function and ___________ melting point.
The energy of a body is its capacity to do .........
A force of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.
A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.
1 J = ______ calorie.
State two advantage of producing hydroelectricity.
State the law of conservation of energy.
What are the units of (a) work, and (b) energy?
The work done on an object does not depend on the :
Name five appliances or machines which use an electric motor.
Name the physical quantity associated with the 'rate of doing work'.
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
Can two agents, doing the same work, have different power?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
