JEE Main 2018PhysicsCenter of Mass Momentum and CollisionMediumMCQ

JEE Main 2018 — Center of Mass Momentum and Collision Question with Solution

JEE Main 2018 (08 Apr)

Question

The mass of a hydrogen molecule is 3.32×10-27 kg. If 1023 hydrogen molecules strike, per second, a fixed wall of the area 2 cm2 at an angle of 45o to the normal, and rebound elastically with a speed of 103 m s-1, then the pressure on the wall is nearly:

Choose an option

Show full solutionCorrect option: B
Correct answer
B2.35×103 N m-2

Step-by-step explanation



F=2mnVcosθ⇒P=2mnVcosθA

⇒P=2×3.32×10-27×1023×1032×2×10-4

⇒P=2.35×103 N m-2

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About this question

This is a previous-year question from JEE Main 2018, covering the Center of Mass Momentum and Collision chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.