Question

7. Small rockets are used to make tiny adjustments in the speeds of satellites. One such rocket has a

thrust of 31 N. If it is fired to change the velocity of a 65000 kg spacecraft by 106 cm/s, how long should
it be fired?

Answer 1

222.3 s

Step-by-step explanation:

From Newton’s law, F=ma hence
`a=\frac {F}{m}`

`a=\frac {31}{65000}=0.000477`

Time,
`t=\frac {\triangle v}{acceleration}`

Where
`\triangle v` is change in velocity

The change in velocity is equivalent to 0.106 m/s

`t=\frac {0.106}{0.000477}=222.2581`