Question

A rifle of 20kg mass can fire 4 bullets per second. The mass of each bullet is 35 x 10-3kg and its final velocin is 400ms- Then what force must be applied on the rifle so that it does not move backwards while firing the bullets? 1) 80N 2)28N 3) -112N 4)-56N​

Answer 1

Answer:

-56 N

Explanation:

force can also be written in terms of varying mass

force= v×dm/dt

dm/dt= 4×35×10-³/1

= 400×35×10-³×4=56N

force of 56N must be apply in opposite direction in order to stop rifle

moving backward

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Answer 2

Answer:

Correct option is 4)-56 N

Explanation:Momentum transferred to rifle by 4 bullet m 1 ​ . So, the force applied on the rifle i.e. 35×10 −3 ×400×4=56N