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October 20, 2014

October 20, 2014

Posted by **Jen** on Wednesday, February 22, 2012 at 6:33pm.

1.) What is the maximum thrust the engines of the rocket can have to just barely avoid blackout? Start with a free-body diagram of the rocket.

2.) What force, in terms of her weight W, does the rocket exert on the astronaut? Start with a free-body diagram of the astronaut.

3.)What is the shortest time it can take the rocket to reach the speed of sound?

- Physics -
**Damon**, Wednesday, February 22, 2012 at 8:37pmforces on rocket are weight down mg

and

force up + T thrust

so

T - m g = m a = 4 m g

T = 5 m g

Force up on astronaut = F

now let M = mass of astronaut

weight of astronat down = Mg = W

so

F - W = M(4g)

F = W + 4 W = 5 W

a = 4 g = 4*9.81

v = 4 * 9.81 t = 331

t = 331 /(4*9.81)

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