Question

1. A valve of a cylinder containing 12kg of compressed gas is opened and the cylinder empties in Im 30second. If the issues from the exit nozzle with average velocity of ms-1 find the force exerted on the cylinder.​

Answer 1

Mass of the gas = 12 kg

mass flow rate coming out of the cylinder,

$12 \: kg \: \: per \: \: 90 \: sec \\ = \frac{2}{15} \: \frac{kg}{sec}$

Force = Mass Flow rate * speed

$= \frac{2}{15} \frac{kg}{s} \times 15 \frac{m}{s} = kg \frac{m}{ {s}^{2} } \\ = 2 \: newton$