472 - Physics Questions Answers

Asked By: SHIVAM SHARMA
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small ring is threaded on an inextensible frictionless cord of length 2l.

The ends of the cord are fixed to a horizontal ceiling. In equilibrium, the  

ring is at a depth h below the ceiling. Now the ring is pulled aside by a  

small distance in the vertical plane containing the cord and released.  

Find period of small oscillations of the ring. Acceleration of free fall is g.

Asked By: ABHISHEK KHANDELWAL
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Sir pls solve
Asked By: KANDUKURI ASHISH
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Asked By: KESHAV
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Find potential energy of disc having charge density sigma uniformly distributed on its surface,radius R

Asked By: AKASH MAURYA
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Let potential of a disc of radius x is V. For this, see video given below

Now potential energy of this disc with a circular layer of charge2πxdxσ is V2πxdxσ put the value of V and integrate inform for any problem 

 

A small metal ball is being pulled gradually on a fixed frictionless hemisphere as shown in the figure. Radii of the ball and that of the pulley are much smaller than that of the hemisphere. As the ball slides from the bottom to a position close to the top of the hemisphere, how do the magnitudes of pulling force F and contact force R between the ball and the hemisphere change?

(a) F increases and R decreases.

(b) F decreases and R increases.

(c) F decreases and R remains unchanged.

(d) F remains unchanged and R decreases.

Asked By: MITUL
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Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed on the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equillibrium.

Asked By: MITUL
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There are N numbers of electrons present in a one-dimensional box of length L. Assuming no coulombic interactions are present, find the ground-state energy of the N-particle system. N is an even number and mass of each electron is m. All electrons have a definite momentum, p, and their collisions with the box are perfectly elastic.

 

Asked By: SAJAG KUMAR
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Sir 

Does time exist or is it just an illusion .

Please tell. 

 

Asked By: SHIVAM SHARMA
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Joshi sir comment

I am not a scientist yet many scientists including Einstein explain time as an illusion, so it can be said.

Sir i have problem in finding velocity of center and trajectory of center. Is there any shortcut to find velocity of center. 
Asked By: FURQAAN
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By rigid body constraints

usinθ=vcosθ v = utanθ Velocity of centre of mass =[u(-j^)+utanθ(i^)]/2 Let centre of rod is (x,y)  2x2+2y2=L2 

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