Posted by **tom** on Tuesday, October 7, 2008 at 10:08pm.

Model rocket engines are sized by thrust, thrust duration, and total impulse, among other characteristics. A size C5 model rocket engine has an average thrust of 5.26 N, a fuel mass of 12.7 g, and an initial mass of 25.5 g. The duration of its burn is 1.90 s.

(a) What is the average exhaust speed of the engine?

(b) If this engine is placed in a rocket body of mass 57.5 g, and if the rocket is fired in outer space, what is the final velocity of the rocket? Assume the fuel burns at a constant rate

for average speed i did fthrust=change of M/change in T i got .78 this is not right help please

## Answer this Question

## Related Questions

- physics - i need help figuring out what formaula to use for finding the final ...
- physics-forces - 1. a fully loaded rocket has a mass of 2.92x10^6kg. It's ...
- Physics - A rocket whish is in deep space and initially at rest relative to an ...
- physics - (ignore the other question i posted this is the right one) A rocket ...
- physics - A rocket has a per-ignition mass of 1100kgs-1 producing a thrust of ...
- PHYSICS - Model rockets are lightweight rockets powered by very small engines. A...
- motion,physics - Model rockets are lightweight rockets powered by very small ...
- physics - if a rocket engine delivers a constant thrust, does it deliver more ...
- physics - The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x...
- Physics - A typical model rocket engine exerts an average force of 5 N on its ...