1.

Calcolate Unc force esented on a rolket, given that the propelling gases are expelled at the of 1500 kgs with a speed of 4,0 10 tn/s (at the moment of takeoff)

Answer»

We know that P = mv

where P = momentum

m = mass

v = velocity

Given v = 4 x 104 m/s

dm/dt = 1500 kg/s

We have,

F = dP/dt

F = v(dm/dt) (∵ P = mv)

F = 4 x 104 x 1500

F = 6000 x 104

F = 6 x 107 N



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