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प्रश्न
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
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उत्तर
A car engine converts chemical energy into mechanical energy.
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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.
What kind of energy is possessed by the following?
A compressed spring ____________.
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
Describe the energy changes which take place in a radio.
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
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?
A body of mass 10 kg falls from a height of 20 m to 8 m. Calculate:
- the loss in potential energy of the body, and
- the total energy possessed by the body at any instant? (Take g = 10 m s-2)
