409 - Physics Questions Answers

Initially the spheres a and b are at potential be a and b respectively now sphere b is earthd by closing the switch the poential of a will become

Asked By: ROMEO ROMI
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No meaning can be incurred by this language. Rectify it for getting answer

Asked By: DARIUS
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Since thickness is same so force per unit length should be same  Force per unit length = F/2πR  Charge density in the sphere is proportional to E so F α qE α σAE α E2R2 Thus force per unit length α E2R2/2πR α E2R Now compare the two cases

Asked By: DARIUS
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At a general point -2Tsinθ = ma    (θ is measured from horizontal) a = -2Mgθ/m = -2Mgy/ml compare with a = -ω2y ω=2Mgml            (1) Now for max displacement of small m mg(h+y) = 2Mgx and x = y2/2l on solving this quadratic eq. for y/l we get  yl-m2M=mMhlyl=mMhl  (given that mM <<hl) so x = m2Mh       (2) so vmax = xω now solve

Two boys enter a running escalator at the ground floor of a shopping mall . The first boy repeatedly follows a cycle of p1=1 step up and then q1=2 steps down whereas the second boy repeatedly follows a cycle of p2=2 steps up and then q2=1 step down. Both of them move relative to escalator with a speed v=50cm/s . If the boys take t1=250s and t2=50s respectively to reach the first floor in complete number of cycles, how fast is the escalator running ? 

 

Asked By: JATIN KUMAR
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let u and v are the speeds of boy and escalator according to given condition  [1(u+v)T-2(u-v)T]n1=[2(u+v)T-1(u-v)T]n2  [1(u+v)-2(u-v)]Tn1=[2(u+v)-1(u-v)]Tn2 Given that Tn1=250 and Tn2=50 [1(u+v)-2(u-v)]250=[2(u+v)-1(u-v)]50 now solve it for v, u is given 

A particle projected from the ground passes two points , which are at height 12m and 18m above the ground and a distance d=10m apart . What could be the minimum speed of projection. Acceleration due to gravity is g=10m/s^2 . 

Asked By: JATIN KUMAR
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Joshi sir comment
Sir along with the written question, can you also calculate the velocity of the midpoint of CD( marked in green) under the same conditions as in question? Thank you
Asked By: DARIUS
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Pls give Solution
Asked By: PRIYANSHU SINGH
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Joshi sir comment
SIR ANSWER IS 4 could u pls explain
Asked By: AYUSH PAINE
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it

Asked By: FURQAAN
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SIR ANSWER IS given as C could u pls explain?

Asked By: AYUSH PAINE
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