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Physics - Center of Mass Question with Solution | TestHub

PhysicsCenter of Mass246Medium2 minQB

PhysicsMediuminteger

A rocket of mass 4000 kg is set for vertical firing. The gases are ejected downward at 980 m/s relative to the rocket. How much gas (in kg/sec) must be ejected per second so that the rocket may have initial upward acceleration of magnitude 19.6 m/s²?

Answer:

120

Solution:

Thrust needed: $F = M (g + a) = 4000 \times 29.4 = 1.176 \times 1 0^{5} N$ $\frac{d m}{d t} = \frac{F}{u} = \frac{1.176 \times 1 0 ^{5}}{980} = 120 k g / s$ Answer 120

Stream:JEESubject:PhysicsTopic:Center of MassSubtopic:246

⏱ 2mℹ️ Source: QB

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