A 135 g bullet is fired from a rifle having a barrel 0.590 m long. Assuming the origin is placed where the bullet begins to move, the force (in newtons) exerted by the expanding gas on the bullet is 20000 + 8000x - 22000x2, where x is in meters.(adsbygoogle = window.adsbygoogle || []).push({});

(a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel.

(b) If the barrel is 1.25 m long, how much work is done, and how does this value compare to the work calculated in part (a)?

For part A, i plugged in .590m into x for the equation of the force, multiplied that by .590 because W = Force x Distance, and since they wanted an answer in kJ i divided by 1000, but it says that my answer is incorrect. Any thoughts?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Work done by expanding gas in a gun on a bullet

**Physics Forums | Science Articles, Homework Help, Discussion**