Question

3

Answer 1

The rocket should be fired for 129600 seconds.

Why?

We can calculate for how long should the rocket be fired by using the following equation:

$Force=mass*aacceleration=mass*\frac{v-v_{o}}{time} \\\\time=\frac{mass*(v-v_{o})}{Force}$

From the statement we know:

- Initial speed equal to zero.

- Force equal to 272N.

- Final speed (for the moment) equal to 62 m/s.

- Mass equal to 72000 Kg.

So, substituting and calculating, we have:

$time=\frac{mass*(v-v_{o})}{Force}$

$time=\frac{mass*(v-v_{o})}{Force}\\\\time=\frac{72000*(63\frac{m}{s} -0)}{35\frac{Kg.m}{s^{2}}}=129600s$

Hence, we have:

Variables: Time

Equations:

$Force=mass*aacceleration=mass*\frac{v-v_{o}}{time} \\\\time=\frac{mass*(v-v_{o})}{Force}$

Answers: The rocket should be fired for 129600 seconds.

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