- #1

anOldMan

- 6

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## Homework Statement

g=10m/s^2

A fully loaded Saturn rocket has a mass of 2.92x10^6kg. Its engines have a thrust of 3.34x10^7N.

a) How much does the rocket weigh. answer 2.92x10^7 N

b) What is the net force on the rocket when it blasts off? answer 4.2x10^6N

c) What is the acceleration as it leaves the launch pad? 144m/s^2

d) What is its speed after 60 seconds? answer 86.4m/s

e) As the rocket moves away, the engine thrust is constant but the mass decreases - why? What effect does this have on acceleration. answer Fuel is consumed; m decreases, a increases.

## Homework Equations

F=ma P.E. =mgh

## The Attempt at a Solution

I have no idea how the answer for b) becomes 4.2x10^6N

Any help would be appreciated.