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CBSE Notes 2011-2012 » IX-Science-Term2

Work and Energy

An elevator with load, weighing 500 kg is moving up with a velocity of 0.2 ms-1, The power of the mo...

Multiple choice question

An elevator with load, weighing 500 kg is moving
up with a velocity of 0.2 ms-1, The power of the
motor in horse power is (1 H.P. = 746 watt)

A stone rubbed on a rough floor and placed on the skin will show heating sensation, because.

Multiple choice question

A stone rubbed on a rough floor and placed on the
skin will show heating sensation, because.

(i) Falling coconut : Kinetic energy (ii) Stone on tower :_______________

Multiple choice question

(i) Falling coconut : Kinetic energy
(ii) Stone on tower :_______________

When non-zero force and displacement are observed with zero work done, the angle between the force a...

Multiple choice question

When non-zero force and displacement are observed
with zero work done, the angle between the force
and displacement is __________.

60 W means that the device will use 60 joule of energy in hour.

Multiple choice question

60 W means that the device will use 60 joule of
energy in hour.

A. We do not work as we push a wall. B. A raised hammer can deliver more kinetic energy. C. Solar en...

Multiple choice question

A. We do not work as we push a wall.
B. A raised hammer can deliver more kinetic energy.
C. Solar energy is a form of hydal energy

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