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CBSE Class 11-science Answered

What would be the answer of question 18 ?  
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Asked by arunavamitra50 | 16 Jun, 2018, 06:09: PM
answered-by-expert Expert Answer
For projectile motion, maximum range is obtained when an object is projected at angle 45°.
 
Maximum range is given by, begin mathsize 12px style R space equals space fraction numerator v subscript 0 superscript 2 over denominator g end fraction space........... left parenthesis 1 right parenthesis end style
( for eqn.(1), refer NCERT text book for XI, part-1, chapter 4, under the heading projectile motion)

where v0 is initial velocity of projectile and g is acceleration due to gravity. We are given that maximum range for a person is 100 m
 
hence begin mathsize 12px style fraction numerator v subscript 0 superscript 2 over denominator g end fraction space equals space 100 space space space space o r space space v subscript 0 superscript 2 space end superscript space equals space 100 cross times g space space space space space space........... left parenthesis 2 right parenthesis end style
if the same person is throwing stone vertically with same speed v0, then the maximum height h reached by the stone is given by
begin mathsize 12px style h space equals space fraction numerator v subscript 0 superscript 2 over denominator 2 g end fraction space equals space fraction numerator 100 g over denominator 2 g end fraction space equals space 50 space m end style................(3)
(begin mathsize 12px style v subscript 0 superscript 2 end style  is substituted from eqn.(2) in eqn(3) )
Answered by Thiyagarajan K | 16 Jun, 2018, 09:55: 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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