# Physics

posted by Anna

The mass of a spacecraft is about 480 kg. An engine designed to increase the speed of the spacecraft while in outer space provides 0.09 N thrust at maximum power. By how much does the engine cause the craft's speed to change in 1 week of running at maximum power? Describe any assumptions you made.

1. Damon

a = .09/480
= 9/48000 m/s^2

dv = a dt

= (9/48,000) *7d/w*24h/d*3600s/h
= 113 m/s

we are assuming constant mass. Possibly fuel or even engine components were ejected.
This is just the speed change due to the propulsion. Presumably there are also gravitational forces acting even in space.

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