Laws of Motion - Result Question 14

14. If the force on a rocket moving with a velocity of 300m/sec is 345N, then the rate of combustion of the fuel, is

[1995]

(a) 0.55kg/sec

(b) 0.75kg/sec

(c) 1.15kg/sec

(d) 2.25kg/sec

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Answer:

Correct Answer: 14. (c)

Solution:

  1. (c) Velocity of the rocket (u)=300m/s and force (F)=345N. According to Newton’s second law, thrust (force) = Rate of change of linear momentum.

Fu=(dmdt)=1.15kg/sec



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