You can think of the work-kinetic energy theorem as a second theory of motion, p

Question

You can think of the work-kinetic energy theorem as a second theory of motion, parallel to Newton's laws in describing how outside influences affect the motion of an object. A 15.0 g bullet is accelerated from rest to a speed of 780 m/s in a rifle barrel of length 72.0 cm.

(a) Find the kinetic energy of the bullet as it leaves the barrel.

(b) Use the work-kinetic energy theorem to find the net work that is done on the bullet.

(c) use the result from part b to find the magnitude of the average net force that acted on the bullet while it was in the barrel.

(d) Now model the bullet as a particle under constant acceleration. Find the constant acceleration of a bullet that starts from rest and gains a speed of 780 m/s over a distance of 72.0 cm.

(e) Modeling the bullet as a particle under a net force, find the net force that acted on it during acceleration.

Explanation / Answer

b) from the work energy theorem net work done   on the bullet is W = finalKE- intialKE where bullet starts from rest so intialvelocity is zero     so intial kintic energy is zero.    W = ( 1/2) mv2 -0       = ( 1/2)( 15 * 10^-3g) ( 780m/s)^2       = 4563J already I did remaining parts first please check .       = ( 1/2)( 15 * 10^-3g) ( 780m/s)^2       = 4563J already I did remaining parts first please check .

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