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प्रश्न
Name the energy transfers which occur when there is a picture on a television screen.
Name the energy conversion that takes place when there is a picture on a television screen.
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उत्तर
A television screen converts electrical energy into light energy and heat energy.
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 pendulum is oscillating on either side of its rest position. The correct statement is:
State whether the object possess kinetic energy, potential energy, or both :
A ceiling fan in the off position ______________
What kind of energy is possessed by the following?
A stone kept on roof-top _______________
Fill in the blank with suitable word :
The ability of a body to do work is called __________. The ability of a body to do work because of its motion is called __________.
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his kinetic energy at the highest point?
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
Name the device or machine which convert :
light energy into heat energy.
What kind of energy transformation take place at a hydroelectric power station?
Describe the energy changes which take place in a radio.
What do you understand by the term 'transformation of energy"? Explain with an example.
Name the energy transfers which occur when an electric ball rings.
Name the energy transfers which occur when someone speaks into a microphone.
Name the energy transfers which occur when a torch is on.
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?
