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CBSE Class 11-science Answered

A body of mass m is released in vaccum from the position A at a height h above the ground.Prove that sum of kinetic and potential energies A, B and C remains constant.  
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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Answered by | 04 Jun, 2014, 03:23: PM

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CBSE 11-science - Physics
why is force attractive when the separation between body and force increases and potential increases and vice versa? why is force repulsive when separation between body and force increases and potential decreases? if PE/force is negative why attraction and if PE/force is positive why there is repulsion? pls explain and prove the above points with suitable examples.
Asked by kaziryan.05 | 22 May, 2021, 11:38: AM
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CBSE 11-science - Physics
State the law of conservation of energy.
Asked by Topperlearning User | 09 Jul, 2014, 10:11: AM
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CBSE 11-science - Physics
An airplane with a mass of 2000 kg sinks 1000 metres moving forward a horizontal distance of 10,000 metres. What will be its new potential energy? (Take g = 10 m/s2)
Asked by Topperlearning User | 08 Jul, 2014, 10:19: AM
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CBSE 11-science - Physics
What is the source of the kinetic energy of the falling rain drop?
Asked by Topperlearning User | 08 Jul, 2014, 10:32: AM
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CBSE 11-science - Physics
Explain why the water at the foot of the waterfall is at different temperature from that at the top?
Asked by Topperlearning User | 08 Jul, 2014, 10:34: AM
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CBSE 11-science - Physics
A body is moving with the speed of 30 m/s. How high can it be lifted to gain an amount of potential energy equal to its kinetic energy. (Take g = 10 m/s2)
Asked by Topperlearning User | 08 Jul, 2014, 10:36: AM
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CBSE 11-science - Physics
A body falling from the height of 10 m rebounds from the hard surface. It loses 20% of its energy in impact. What is the height to which it would raise after the impact and where this energy goes after hitting the surface?
Asked by Topperlearning User | 08 Jul, 2014, 10:45: AM
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CBSE 11-science - Physics
Two springs have force constants k1 and k2 where k1 > k2. On which spring, more work is done if they are stretched by the same magnitude of force. 
Asked by Topperlearning User | 08 Jul, 2014, 10:56: AM
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CBSE 11-science - Physics
If a block attached to a spring (whose one end is fixed) is pulled up to a distance xo and released, the amplitude of its motion cannot exceed Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. why?
Asked by Topperlearning User | 08 Jul, 2014, 10:59: AM
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CBSE 11-science - Physics
Draw a plot of spring force versus displacement x. Hence find an expression for the P.E of an elastic spring.
Asked by Topperlearning User | 08 Jul, 2014, 11:08: AM
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