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CBSE Class 12-science Answered

Hi tick the correct answer. Only one can be correct. 
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Asked by jain.pradeep | 31 May, 2019, 01:37: PM
answered-by-expert Expert Answer
Answer (E) II and III only
 
Explanation :-  (I) gravitational force exerted by earth on Sun  is same as gravitational force exerted by sun on earth
 
(II) acceleration of earth due to force exerted by sun is proportional to mass of sun.
Similarly acceleration of sun due to force exerted by earth is proportional to mass of earth.
Since mass of sun is greater than mass of earth, acceleration of earth due to force exerted by sun is greater than
acceleration of sun due to force exerted by earth
 
(III) we have gravitational force that provides centripetal force so that earth orbits around the sun in elliptical path.
 
If m is mass of earth, M is mass of sun, G is gravitation constant, r is radial distance between center of earth and
center of sun and v is the speed of earth in elliptical orbit, then
 
begin mathsize 14px style fraction numerator m space v squared over denominator R end fraction space equals space G fraction numerator m space M over denominator R squared end fraction space space space o r space space space space space space v space equals space square root of fraction numerator G space M over denominator R end fraction end root end style
Hence speed of earth in elliptical orbit varies with distance R
Answered by Thiyagarajan K | 01 Jun, 2019, 10:16: AM

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CBSE 12-science - Physics
solve option e
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Asked by dasrituparna1999 | 13 Apr, 2024, 06:56: AM
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CBSE 12-science - Physics
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4. n= A The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
Asked by dasrituparna1999 | 12 Apr, 2024, 09:26: PM
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CBSE 12-science - Physics
which answer is correct and most appropriate with explanation
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Asked by mishrigupta19319 | 08 Apr, 2024, 06:28: PM
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CBSE 12-science - Physics
8212
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Asked by madhav9119887644 | 07 Apr, 2024, 08:10: PM
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CBSE 12-science - Physics
ans the questions wit reason
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Asked by mishrigupta19319 | 07 Apr, 2024, 11:23: AM
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CBSE 12-science - Physics
I don't know which concept and formula is used
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Asked by adityagalar2007 | 06 Apr, 2024, 01:06: PM
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CBSE 12-science - Physics
what is the mass of the bidy
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Asked by amlanmcob | 06 Apr, 2024, 12:27: PM
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CBSE 12-science - Physics
13./A point charge of 12 µC is located at the centre of a cube of side 1 m. Calculate the electric flux through each face of the cube. (H.S.S.C.E.1999~S) [Ans. 2.26\times10^{5}N~m^{2}C^{-1}]
Asked by hussain221man | 05 Apr, 2024, 08:44: PM
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CBSE 12-science - Physics
A coil of N turns is placed in a magnetic field B such that B is perpendicular to the plane of the coil. B changes with time as B=B0 cos 2元 where T is time period. The magnitude of emf-induced in the coil will be maximum at
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Asked by mishrigupta19319 | 05 Apr, 2024, 12:01: PM
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CBSE 12-science - Physics
a charge of 2microcoulomb experience a force of 6N when placed at a point in an electric field .find electric field at that point
Asked by manishamunda787 | 02 Apr, 2024, 11:07: AM
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