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CBSE Class 11-science Answered

A object moving with speed of 6.25 m/s, is decelerated  at a rate given by a=-2.5√v, where v is the instantaneous speed. The time taken by the object to come to rest would be
Asked by binayakbiswas | 16 Jul, 2019, 09:50: PM
answered-by-expert Expert Answer
Acceleration a = dv/dt = -2.5√v
 
 begin mathsize 14px style fraction numerator d v over denominator square root of v end fraction space equals space minus 2.5 space d t space space space space B y space space i n t e g r a t i o n comma space space integral subscript v subscript i end subscript superscript v subscript f end superscript fraction numerator begin display style d v end style over denominator begin display style square root of v end style end fraction space equals space minus 2.5 integral subscript 0 superscript T d t open vertical bar 2 square root of v close vertical bar subscript v subscript i end subscript superscript v subscript f end superscript space equals space minus 2.5 space T sin c e space v subscript f equals 0 space a n d space v subscript i equals 6.25 space m divided by s space comma space space w e space g e t comma space space space space 2 square root of 6.25 end root space equals space 2.5 space T space space o r space space T space equals space 2 space s end style
 
Where T is time taken by the object to come to rest
Answered by Thiyagarajan K | 16 Jul, 2019, 10:49: 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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