4. A wooden block (mass M) is hung from a peg by a massless rope. A speeding bul

Question

4. A wooden block (mass M) is hung from a peg by a massless rope. A speeding bullet (with mass m and initial speed to) collides with the block at timet 0 and embeds in it. Let S be the system consisting of the block and bullet. Which quantities are conserved between t--10 s and t +10 s? S/ (A) The total linear momentum of (B) The horizontal component of the linear momentum of S. dkb (C) The mechanical energy of S (D) The angular momentum of S as measured about a perpendicular axtis through the peg (E) None of the above are conserved.

Explanation / Answer

since we are looking at the systen from time t=-10 sec to +10 sec no momentum is conserved,also the collision is instantaneous and the forces like the tension acts on the system after the collision.The collision is inelastic(the bullet is embedded in the block) ,so mechanical energy is lost.

The answer is E.

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