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CBSE Class 11-science Answered

A roulette coming to rest turning 3 revolutions in 18s. What is its deceleration? How many revolutions does it turn while coming to rest?
Asked by lekhakarthikeyan | 02 Aug, 2017, 10:14: PM
answered-by-expert Expert Answer
begin mathsize 12px style The space roulette space comes space to space rest. rightwards arrow straight omega subscript straight i space equals space 3 space rev divided by straight s space and space straight omega subscript straight f space equals space 0 space and space straight t space equals space 18 space straight s Using space the space formula space Angular space acceleration space equals space fraction numerator Change space in space angular space acceleration over denominator Time end fraction space equals space fraction numerator straight omega subscript straight f space minus space straight omega subscript 0 over denominator straight t end fraction On space substituting space and space calculating comma space we space get straight alpha space equals space minus space 0.167 space rev divided by straight s squared Rotations space before space it space will space come space to space rest space is space calculated space using space the space formula straight theta space equals space straight omega subscript straight i straight t space plus space 1 half at squared On space substituting space and space calculating comma space we space get straight theta space equals space 27 space rev end style
Answered by Yashvanti Jain | 03 Aug, 2017, 12:57: 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
A platform is moving upwards with an acceleration of 5m/s².At the moment when it's velocity is 3m/s, a ball is thrown from it with a speed of 30m/s w. r. t platform at an angle of 30 with horizontal w. r. t plat form. What is the time taken by the ball to return to the platform
Asked by shailajakandikatla19 | 18 Jan, 2024, 06:40: PM
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CBSE 11-science - Physics
A particle is projected from a point P with a velocity v at an angle θ with horizontal. At a certain point Q it moves at right angles to its initial direction. Then (a) velocity of particle at Q is vsintheta (b) velocity of particle at Q is Vtantheta (c) time taken from P and Q is v/g sin theta (d) time taken from P and Q is v/gsectheta
Asked by hy9022075 | 11 Jan, 2023, 05:06: PM
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CBSE 11-science - Physics
A baseball is hit by a bat and given a velocity of 40.0m/s at an angle of 30 degree above the horizontal. The height of the ball above the ground upon impact with the bat is 1.0 m  a) what maximum height above the ground does the wall reached b) a feilder is 110.0 m from home plate with the ball is hit and the balls trajectory is directly at home if he begins running at the moment the ball is hit and catches the ball. when it is still 3.0 m above the ground. How long does he run before catching the ball. C) how fast does he have to run in order to catch the ball
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Asked by lonese3325 | 12 Jun, 2022, 01:42: PM
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CBSE 11-science - Physics
A particle of mass m is given speed u at angle theta at topmost point It breaks into two equal parts one comes to rest  find point of landing of second mass
Asked by ashishgarud539 | 15 Dec, 2021, 04:12: PM
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CBSE 11-science - Physics
a projector is projected horizontal with velocity 10 ms making distance 45 degree .what is time of flig
Asked by Kalapnadevi0000 | 14 Apr, 2021, 03:06: PM
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CBSE 11-science - Physics
what is the meaning of projectile motion
Asked by riyag9034 | 26 Jul, 2020, 07:06: PM
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CBSE 11-science - Physics
If a ball launched with initial velocity of 25 m/s at 45 degree. Find the maximum range covered by the ball? 
Asked by sehgalgayrav810 | 29 May, 2020, 07:19: AM
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CBSE 11-science - Physics
Pls solve
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Asked by suchananag2002 | 27 Feb, 2020, 09:48: AM
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CBSE 11-science - Physics
what is lowest speed of an object in the projectile motion fired with an angle 30º and speed is 5m/s?
Asked by nirvardhansinghranawat7773 | 11 Oct, 2019, 01:27: PM
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