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प्रश्न
Name the energy transfers which occur when someone speaks into a microphone.
Name the energy conversion that takes place when someone speaks into a microphone.
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उत्तर
A microphone converts sound energy to electrical energy.
संबंधित प्रश्न
State the condition under which the mechanical energy is conserved.
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 flying aeroplane _______________.
State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on the ground ____________.
What kind of energy is possessed by the following?
A running car ____________
What kind of energy is possessed by the following?
Water stored in the reservoir of a dam __________.
What kind of energy is possessed by the following?
A stretched rubber band _____________
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)
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
Name the device or machine which convert :
Electrical energy into light energy.
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
What kind of energy transformations take place at a coal-based thermal power station?
How much electrical energy in joules does a 100 watt lamp consume : in 1 minute?
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
A ball falls to the ground as shown below :
What is the potential energy of ball at B?
The device which converts mechanical energy into energy which runs our microwave oven 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?
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)
