A diwali rocket is ejecting 0 05 kg of gases per second at a velocity of 400 m s -1 - Science - Work and Energy

Question

A diwali rocket is ejecting 0 05 kg of gases per second at a
velocity of 400 m s -1 The accelerating force on the rocket is
( a ) 20 dyne ( b ) 20 newton
( c ) 20 kg wt ( d ) sufficient data not given

Jyoti Pant · Accepted Answer

We have,

dm/dt = 0 05 kg/s

v = 400 m/s

We know,

P = mv

=> dP/dt = d(mv)/dt = v(dm/dt) + m(dv/dt)

=> F = v(dm/dt) + 0

=> F = (400)(0 05)

=> F = 20 N

A diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m s -1 . The accelerating force on the rocket is ( a ) 20 dyne ( b ) 20 newton ( c ) 20 kg wt ( d ) sufficient data not given

A diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m s -1 . The accelerating force on the rocket is

( a ) 20 dyne ( b ) 20 newton

( c ) 20 kg wt ( d ) sufficient data not given