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CBSE Class 11-science Answered

From what height must a block of ice dropped into a well so that 5% of it may melt. Given both ice&water at 0C L=80 CAL/G ,J=4.2J/cal, g=980cm/s.
Asked by Pawan chhipa | 23 Nov, 2012, 05:12: PM
answered-by-expert Expert Answer
at the height , the object possess= mgh=pot energy
just before reaching the ground that fully converts to kinetic energy.
On touching the ground, that energy converts to heat and due to that heat certain portion of it converts to water.
W=JH
mgh=Jm'L.....say m' amount of ice melts.
h=1.68m on putting the values.
Answered by | 29 Nov, 2012, 04:23: PM
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CBSE 11-science - Physics
How much heat energy a petrol engine would require to do 20 kWh of work? Its adiabatic compression ratio is 9 and ?= 1.5.
Asked by sathish | 12 Jan, 2013, 11:39: PM
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CBSE 11-science - Physics
while v pump air into de cycle through air pump,v feel hotness in de air pump and de tube,,,,is that due 2 de friction created due 2 de piston or anything else. explain pls.
Asked by sathish | 11 Jan, 2013, 11:31: PM
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CBSE 11-science - Physics
Explain various part of carnot's engine? explain the working of carnot engine?
Asked by Kashif | 08 Jan, 2013, 08:13: PM
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CBSE 11-science - Physics
what is specific heat? how are cp and cv calculated?
Asked by Nitin Gupta | 02 Jan, 2013, 11:05: AM
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CBSE 11-science - Physics
When 495 grams of boiling water is poured in a mug which weighs 0.15kg,then the temperature of water falls to 69.5degree Celsius if the specific heat capacity of the mug is 0.8*10^3 Calculate the amount of heat lost by water?
Asked by Manmohan Singh Rekhi | 01 Jan, 2013, 12:13: PM
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CBSE 11-science - Physics
sir, in the video you have to ask a question two moles of an ideal gas expands isothermally at 298k,from an initial volume of vi=0.025m3 to a final volume of vf=0.050m3? In the answer n=2.0 moles R=8.31J/(mol.k)can you tell me why the value of n=2.0moles R=8.31j(mol.k).
Asked by Pawan chhipa | 16 Dec, 2012, 09:29: AM
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CBSE 11-science - Physics
A refrigerator with its power on is kept in a closed room ,with its door open. What happens to the temperature of the room? why?
Asked by | 11 Dec, 2012, 11:09: AM
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CBSE 11-science - Physics
How does the internal energy of a given mass of gas depends upon Pressure, Volume, Temperature of gas, Process in achieving that state of mass of gas?
Asked by Divyansh | 05 Dec, 2012, 05:51: PM
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CBSE 11-science - Physics
What are Adiabatic Wall,Diathermic wall,Thermal wall,Diadiabatic wall?
Asked by Divyansh | 05 Dec, 2012, 05:46: PM
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CBSE 11-science - Physics
how does fuel like petrol etc convert itself in form of heat energy which indeed converts into mechanical energy in vehicles?
Asked by | 02 Dec, 2012, 10:02: PM
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