Advertisements
Advertisements
प्रश्न
उत्तर
This is because at each point of the circular path, the displacement is perpendicular to the force, which is directed towards the centre, along the radius.
APPEARS IN
संबंधित प्रश्न
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
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.
When does a force perform work?
State two advantage of producing hydroelectricity.
State the SI unit of work.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Why does a spanner have a long handle?
Explain the difference between a uniform linear motion and a uniform circular motion.
What is the work done when the object acted upon by a force remains at rest?
A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Write an expression for work done by a force depends?
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?
Name the material commonly used for the manufacturing of solar cells.
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
