A Diwali cracker releases 25 gram gas per second, with a speed of $400 \mathrm{~ms}^{-1}$ after explosion.…

A Diwali cracker releases 25 gram gas per second, with a speed of $400 \mathrm{~ms}^{-1}$ after explosion. The force exerted by gas on the cracker is
  1. 100 dyne
  2. 16 newton
  3. 10 newton
  4. 10,000 dyne

Solution

$\mathrm{F}=$ rate of change of momentum $=25 \times 10^{-3} \mathrm{~kg} / \mathrm{s} \times 400 \mathrm{~m} / \mathrm{s}$ $=10 \mathrm{~N}$

Asked in: MHT CET 2020 (13 Oct Shift 2)

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