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प्रश्न
Fill in the blanks with suitable words :
The principle of ___________ of energy says energy can be transformed from one form to another, but it cannot be ___________ or ___________.
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उत्तर
The principle of conservation of energy says energy can be transformed from one form to another, but it cannot be created or destroyed.
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संबंधित प्रश्न
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his potential energy at the highest point? (g = 10 m/s2)
Define the term 'energy' of a body. What is the SI unit of energy.
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both the spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same :
Name the device or machine which convert :
Light energy into electrical energy.
Name the device or machine which convert :
Electrical energy into sound energy.
Name the energy transfers which occur when :
someone speaks into a microphone
Which one of the following is not the unit of energy?
In the case of negative work, the angle between the force and displacement is
A girl with having a mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 m s–1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?
