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Class 11
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Physics
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Work, Energy and Power
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Potential Energy
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Potential Energy
Potential Energy
7 Mins
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Important Questions
A particle in a certain conservative force field has a potential energy given by
$U=z20xy $
. The force exerted on it is?
Medium
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>
A body is dropped from a certain height from the ground. When it is halfway down, it possess,
Easy
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>
A person pulls a bucket of water from a well of depth
$h$
. If the mass of uniform rope is
$m$
and that of the bucket full of water is
$M$
, then work done by the person is:
Hard
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>
Calculate the work done in lifting water of 200 kg through a vertical distance of 6 m.
$(g=10ms_{−2})$
Easy
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>
A chain of mass
$M$
is placed on a smooth table with
$1/n$
of its length
$L$
hanging over the edge. The work done in pulling the hanging portion of the chain back to the surface of the table is:
Medium
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>
The diagram given below shows a ski jump. A skier weighing
$60kgf$
stands at A at the top of ski jump. He moves from A to B and takes off for his jump at B.
(a) Calculate the change in the gravitational potential energy of the skier between A and B.
(b) If
$75$
% of the energy in part (a) becomes kinetic energy at B. Calculate the speed at which the skier arrives at B.
$(Takeg=10ms_{−1})$
Medium
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>
A chain of length
$l$
and mass
$m$
lies of the surface of a smooth hemisphere of radius
$R>1$
with one end tied to the top of the hemisphere. Taking base of the hemisphere as reference line, find the gravitational potential energy of the chain.
Medium
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>
Water stored in a dam possesses:
Medium
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>
Define potential energy. Derive an expression for gravitational potential energy. Mention its unit.
Medium
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>
A body of mass 0.2 kg falls from a height of 10m to a height of 6m above the ground. Find the loss in potential energy taking place in the body. [
$g=10ms_{−2}$
].
Easy
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>