Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main2018PhysicsCenter of Mass, Momentum and CollisionActual

The mass of a hydrogen molecule is 3.32 × 10 - 27 kg . If 10 23 hydrogen molecules strike, per second, a fixed wall of the area 2 cm 2 at an angle of 45 o to the normal, and rebound elastically with a speed of 10 3 m s - 1 , then the pressure on the wall is nearly:

Options

  1. A4.70 × 10 2   N   m - 2
  2. B2.35 × 10 3   N   m - 2
  3. C4.70 × 10 3   N   m - 2
  4. D2.35 × 10 2   N   m - 2

Correct answer

B. 2.35 × 10 3   N   m - 2

Step-by-step solution

F = 2 m n V c o s θ ⇒ P = 2 m n V c o s θ A ⇒ P = 2 × 3.32 × 10 - 27 × 10 23 × 10 3 2 × 2 × 10 - 4 ⇒ P = 2.35 × 10 3   N   m - 2

Practice Center of Mass, Momentum and Collision on Quantrex Academy →

More from Center of Mass, Momentum and Collision

Two identical bodies A and B of equal masses have initial velocities v₁ = 4 i m/s and v₂ = 4 j m/s respectively. The body A has acceleration a₁ = 6 i + 6 j m/s ^2 while the acceler 2026The position of center of mass of three masses 2 kg, 3 kg and 15 kg placed with respect to mid point ( p ) of normal bisector, as shown in the figure is _______. 2026Two blocks of masses 2 kg and 1 kg respectively, are tied to the ends of a string which passes over a light frictionless pulley as shown in the figure below. The masses are held at 2026The position of an object having mass 0.1 kg as a function of time t is given as r = (10t^2 i + 5t^3 j ) m. At t = 1 s, which of the following statements are correct ? A. The linea 2026A body of mass 14 kg initially at rest explodes and breaks into three fragments of masses in the ratio 2: 2: 3 . The two pieces of equal masses fly off perpendicular to each other 2026In a perfectly inelastic collision, two spheres made of the same material with masses 15 kg and 25 kg, moving in opposite directions with speeds of 10 ~m / s and 30 ~m / s , respec 2026Given below are two statements : Statement I : For a mechanical system of many particles total kinetic energy is the sum of kinetic energies of all the particles. Statement II : Th 2026In a scattering experiment, a particle of mass 2 m collides with another particle of mass m , which is initially at rest. Assuming the collision to be perfectly elastic, the maximu 2025 Full Center of Mass, Momentum and Collision list All JEE Main PYQs