An indestructible bullet 2.00 cm long is fired straight through aboard that is 1

Question

An indestructible bullet 2.00 cm long is fired straight through aboard that is 10.0 cm thick. The bullet strikes the board with aspeed of 480 m/s and emergeswith a speed of 275 m/s. (Tosimplify, assume that the bullet accelerates only while the fronttip is in contact with the wood.) (a) What is the average acceleration of the bullet through theboard?
m/s2 (I was able to get this answer correct, but cannotfigure out how to do the rest)

(b) What is the total time that the bullet is in contact with theboard?
s

(c) What thickness of board (calculated to 0.1 cm) would it take tostop the bullet, assuming that the acceleration through all boardsis the same?
cm

.
(a) What is the average acceleration of the bullet through theboard?
m/s2 (I was able to get this answer correct, but cannotfigure out how to do the rest)

(b) What is the total time that the bullet is in contact with theboard?
s

(c) What thickness of board (calculated to 0.1 cm) would it take tostop the bullet, assuming that the acceleration through all boardsis the same?
cm

.

Explanation / Answer

(a) Whatis the average acceleration of the bullet through the board?
m/s2 (I was able to get thisanswer correct, but cannot figure out how to do therest)
accel;eration=a=v2-u2/2s=275*275-480*480/.2=773875m/sec8sec

(b) What is the total time that the bullet is in contact with theboard?
s time=275-480/-773875=0.2649*10-3sec=0.002649sec


(c) What thickness of board (calculated to 0.1 cm) would it take tostop the bullet, assuming that the acceleration through all boardsis the same?
cm
velocity at the end of first board is 275
velocty after travelling x cm =0
a=-773875
v=0
u=480
s=0-480*480/2*773875=0.1488m=14.88cm

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.