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KVPY2017PhysicsMechanical Properties of Fluids

In Guericke's experiment to show the effect of atmospheric pressure, two copper hemispheres were tightly fitted to each other to fom a hollow sphere and the air from the sphere was pumped out to create vacuum inside. If the radius of each hemisphere is R and the atmospheric pressure is P , then the minimum force required (when the two hemispheres are pulled apart by the same force) to separate the hemispheres is

Options

  1. A2 R² P
  2. B4 R² P
  3. CR² P
  4. DR² P / 2

Correct answer

C. R² P

Step-by-step solution

F= (P₀-0 ) AF= R² P

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