A 130-g bullet is fired from a rifle having a barrel 0.636 m long. Choose the or

Question

A 130-g bullet is fired from a rifle having a barrel 0.636 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is 13500 + 10500x - 27250x2, where x is in meters.
(a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel.
Correct: Your answer is correct. kJ

(b) If the barrel is 1.08 m long, how much work is done?
Incorrect: Your answer is incorrect.
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. kJ

(c) How does this value compare with the work calculated in part (a)?
percent difference = %

Explanation / Answer

W=Intedral(Fds), so you have to integrate the above equation from 0 to .636 in the fifst case and from 0 to 1.08 in the second a)W1 = (13500x + 10500X^2/2 -27250x^3/3) from 0 to .636 = b)W2 = (13500x + 10500X^2/2 -27250x^3/3)from 0 to 1.08 = percentage difference = (w2-w1)/w1 * 100

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