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प्रश्न
Give an example
Electrical energy changes to heat energy.
उत्तर
Electric iron
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संबंधित प्रश्न
Why is a jack screw provided with a long arm?
A box of weight 150 kgf has gravitational potential energy stored in it equal to 14700 J. Find the height of the box above the ground. (Take g = 9.8 N kg-1)
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
What is the condition for a force to do work on a body?
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
What is the SI unit of work?
What is the work done when the object acted upon by a force remains at rest?
A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
What is the difference between renewable and non-renewable resources?
A ______ should act on an object.
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.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
