A cracker rocket is ejecting gases at a rate of 0.05 kg / s with a velocity 400 m / s. The accelerating force on the rocket is

Question

A cracker rocket is ejecting gases at a rate of 0.05 kg / s with a velocity 400 m / s. The accelerating force on the rocket is (A) 20 dyne (B) 20 N (C) 200 N (D) Zero

Tardigrade Admin · Accepted Answer

For a variable mass system F =(v d m/d t) =400 × 0.05=20 N

Q. A cracker rocket is ejecting gases at a rate of $0.05 k g / s$ with a velocity $400 m / s$ . The accelerating force on the rocket is

20 dyne

20 N

200 N

Zero

For a variable mass system
$F = \frac{v d m}{d t}$
$= 400 \times 0.05 = 20 N$

Q. A cracker rocket is ejecting gases at a rate of 0.05kg/s with a velocity 400m/s. The accelerating force on the rocket is