Question

In a rocket of mass $1000\, kg ,$ fuel is consumed at a rate of $40 \,kg\, s ^{-1}$. The velocity of gases ejected from rocket is $5 \times 10^{4}\, m \,s ^{-1}$. The thrust on the rocket is

• A. $2 \times 10^{3} N$
• B. $2 \times 10^{4} N$
• C. $2 \times 10^{6} N$
• D. $2 \times 10^{8} N$

Answer 1

Answer: (C)

Thrust, $F=u\left(\frac{d m}{d t}\right)=5 \times 10^{4} \times 40=2 \times 10^{6} N$