A scale is adjusted to zero . Particles...

A scale is adjusted to zero . Particles fall from a height h = 250 m before colliding with the balance pan of the scale . The collisions are elastic . If each particle has a mass of m = 100 mg and collisions occur at the rate n = 1000 particles per second , what is the scale reading in kg ?

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The correct Answer is:

`2 mn sqrt(2gh) = 1.43` kg

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