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Earn 100

What is the relation between calories and joule?

Important Questions on Work and Energy

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Science>Physics>Work and Energy>Energy
The energy used in households, industries and commercial establishments is usually expressed in:
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Science>Physics>Work and Energy>Energy
A body in equilibrium does not have
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Science>Physics>Work and Energy>Energy
The sum of kinetic energy and potential energy of an object is its total ______energy.
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Science>Physics>Work and Energy>Energy
A block mass of 10 kg is dropped from a height of 10 m from the earth's surface and it falls onto a vertical helical spring of stiffness 5000 N/M and length 50 cm. The compression of the spring is (Take g=10 m/s2)
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Science>Physics>Work and Energy>Energy
A 100 W bulb is used for 10 hours energy consumed is _____.
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Science>Physics>Work and Energy>Energy
When an object falls freely towards the earth, then its total energy:
MEDIUM
Science>Physics>Work and Energy>Energy

A car of mass 1500 kg is at rest. What is the force (in newtons) required to accelerate the car from rest to a speed of 20 m/s? Distance covered by the car is 40 m.

(Only write the magnitude of the answer in the given box, no need to write the unit.)

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Science>Physics>Work and Energy>Energy
The kinetic energy of an object _______with its speed.
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Science>Physics>Work and Energy>Energy
Watt-second is the unit of _____.
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Science>Physics>Work and Energy>Energy
If 20 J of work is done in moving a body from one place to another, the energy of the body is
MEDIUM
Science>Physics>Work and Energy>Energy
Natural length of a spring is 60 cm and its spring constant is 4000 N/M. A mass of 20 kg is hung from it. The extension produced in the spring is, (take,g=9.8m/s2)
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Science>Physics>Work and Energy>Energy
An electric heater is rated 1500 W. The energy used by it in 10 hours is :
MEDIUM
Science>Physics>Work and Energy>Energy
Which of the following energy change involves frictional force?
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Science>Physics>Work and Energy>Energy
KWh is a unit of _____.
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Science>Physics>Work and Energy>Energy
We can neither create nor destroy ___________. We can just change it from one form to another.
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Science>Physics>Work and Energy>Energy
 A certain household has consumed 200 units of energy during a month. Its value in joules will be
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Science>Physics>Work and Energy>Energy
When a sound wave travels in the air, the physical quantity which is transferred from one place to the other is:
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Science>Physics>Work and Energy>Energy
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
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Science>Physics>Work and Energy>Energy
1 kWh is equivalent to
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Science>Physics>Work and Energy>Energy
A ball of mass 0.2 kg falls from the ceiling of an elevator moving down with a uniform speed of 5 m s-1. It hits the floor of the elevator (length of the elevator = 5 m) and does not rebound. The amount of heat produced by the impact is (Take g=10 m s-2)