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Physics >> Mechanics part 1 >> Newton's laws of motion and friction IIT JEE

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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Joshi sir comment

Physics >> Modern Physics >> Matter and Waves IIT JEE

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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Physics >> Modern Physics >> Matter and Waves IIT JEE

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.

Physics >> Mechanics part 1 >> Newton's laws of motion and friction IIT JEE

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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Joshi sir comment

By rigid body constraints

$u \sin θ = v \cos θ \Rightarrow v = u \tan θ V e l o c i t y o f c e n t r e o f m a s s = [u (- \hat{j}) + u \tan θ (\hat{i})] / 2 L e t c e n t r e o f r o d i s (x, y) \Rightarrow {(2 x)}^{2} + {(2 y)}^{2} = L^{2}$

Physics >> Electricity >> Electric Field and Potential IIT JEE

Asked By: SRIJAN

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Joshi sir comment

$W e k n o w t h a t \sum_{p l a n e} E d S \cos θ = \frac{q}{6 ε_{0}} (1) a n d N e t f o r c e o n t h e p l a n e = \sum_{p l a n e} F_{⊥} d Q = \sum_{p l a n e} q E \cos θ d S σ = \frac{Q}{d^{2}} \sum_{p l a n e} q E \cos θ d S (2) N o w s o l v e e q . (1) a n d (2)$