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CBSE Class 11-science Answered

20th sum
Asked by lovemaan5500 | 25 Sep, 2018, 07:04: PM
answered-by-expert Expert Answer
Stokes formula is given by,  6π×a×η×v = m×g...............(1)
 
where a is radius of drop, η is coeff of viscosity, v is terminal velocity,
m is mass of drop and g is acceleration due to gravity.
 
Clubbing together all constants, we rewrite eqn.(1) as,   a×v = K×m ..............(2)
 
Let v' be the terminal velocity for the coaleased drop.
For coaleased drop, mass will be doubled and new radius will be begin mathsize 12px style 2 to the power of bevelled 1 third end exponent space a end style as explained below, if a is the radius of original drop.
begin mathsize 12px style V space equals space 4 over 3 pi a cubed space space semicolon space space 2 V space equals space 4 over 3 pi cross times open parentheses 2 to the power of bevelled 1 third end exponent a close parentheses cubed end style

from eqn.(2) we write, begin mathsize 12px style fraction numerator a cross times v over denominator 2 to the power of begin display style bevelled 1 third end style end exponent cross times a cross times v space apostrophe end fraction space equals space fraction numerator m over denominator 2 m end fraction space equals space 1 half end style .......................(3)
from eqn.(3), we have begin mathsize 12px style v space apostrophe space equals space 2 to the power of bevelled 2 over 3 end exponent space v space equals space cube root of 4 space cross times space 5 space equals space 7.93 space c m divided by s end style
Answered by Thiyagarajan K | 25 Sep, 2018, 10:42: PM
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CBSE 11-science - Physics
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Asked by sheikhsaadat24 | 17 Apr, 2024, 09:41: PM
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CBSE 11-science - Physics
.A SHM is expressed by the equation x = A cos (ωt + φ) and the phase angle φ =0. Draw graphs to show variation of displacement, velocity and acceleration for one complete curve in SHM.
Asked by sy123946 | 07 Apr, 2024, 04:23: PM
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CBSE 11-science - Physics
the dimension of stopping potential vo in photoelectric effect in units of plank's constant 'h',speed of light 'c' and gravitational constant 'G' and ampereA
Asked by derhebha955 | 03 Apr, 2024, 09:03: AM
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CBSE 11-science - Physics
In this que while solving it we take D F of alpha =D.F of beta.Why is it so?
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Asked by sumedhasingh238 | 29 Mar, 2024, 05:15: PM
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CBSE 11-science - Physics
In physics if 2 quantities are dimensionless then their dimensional formula are equal?
Asked by sumedhasingh238 | 28 Mar, 2024, 11:10: PM
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CBSE 11-science - Physics
7. State the relation between maximum range and maximum height of the projectile if the angle of projection is 45 deg
Asked by roshnibudhrani88 | 23 Mar, 2024, 05:52: PM
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CBSE 11-science - Physics
The second overtone of a pipe closed at one end has the same frequency as the third overtone of a pipe open at both ends. Compare the length of the pipes
Asked by emad.amd | 21 Mar, 2024, 12:00: PM
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CBSE 11-science - Physics
two forces whose magnitude are in the 3:5 give a resultant f Jatio 3:5 give 20 N. If fac 20. It fue angle of thread indination of each face find Magnitude
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Asked by vinitdubey7735 | 14 Mar, 2024, 11:21: AM
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CBSE 11-science - Physics
Q17. The velocity time relation of an electron starting from rest is given by v = kt where k = 6m / (s ^ 2) Calculate the distance traversed in 2 sec. 122
Asked by om636694 | 04 Mar, 2024, 09:10: PM
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CBSE 11-science - Physics
pressure of a gas in a closed cylinder is expressed in the following manner p=pa+hpg identity the expression for absolute pressure and gauge pressure
Asked by rajuinwati12 | 04 Mar, 2024, 09:22: AM
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