Calculate the force needed to provide an initial upward acceleration of 40 m/s2 to a 0.4-kg rocket.
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Initial upthrust,
F = m(g+a), here a = 40 m/s2
F = 400( 10 + 40) = 20000 N
By Newton’s 2nd law , F = dp /dt = d(mu)/dt = u (dm/dt)
so, dm/dt = F /u = 20000/800 = 25 kg/s
F = m(g+a), here a = 40 m/s2
F = 400( 10 + 40) = 20000 N
By Newton’s 2nd law , F = dp /dt = d(mu)/dt = u (dm/dt)
so, dm/dt = F /u = 20000/800 = 25 kg/s
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