oo Verizon LTE 7:06 PM online.e.u.edu Refer to the figure below. A 7.00-g bullet
ID: 1776390 • Letter: O
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oo Verizon LTE 7:06 PM online.e.u.edu Refer to the figure below. A 7.00-g bullet is fired into a ballistic pendulum whose bob has a mass of 0.950 kg. The bob rises to a maximum height of 0.220 m. Ignore air resistance and other frictional forces during the swing of the pendulum 12) When the bob (with the bullet that is caught inside) swings to the maximum height, h, which quantity is conserved? A) Total momentum of the system B) Mechanical energy of the system C) Total velocity of the system D) Total kinetic energy of the system E) Total potential energy of the system 13) What is the velocity,'% of the bob (with the bullet caught inside) before it swings to height h? A) 4.31 m's B) 2.08 m/s C)0 D)9.80 m/s 14) When the bullet is fired into the bob, the bullet is stuck inside the bob. The type of collision between the bullet and the bob is A) Elastic collision B) Inelastic collision C) None of the above 15) During the collision between the bullet and the bob, which quantity is conserved? A) Total momentum of the system B) Mechanical energy of the system C) Total velocity of the system D) Total kinetic energy of the system E) Total potential energy of the system 16) The initial speed, Vo, of the bullet is determined to boe A) 284 ms B) 300 m's D) 2.36 msExplanation / Answer
12) Mechanical energy of system
13) v = sqrt(2gh) = sqrt(2 x 9.8 x 0.22) = 2.08 m/s
14) Inelastic collision (as relative velocity after collision = 0)
15) Total momentum of system (as no external force is acting)
16) 7vo = 957v
=> vo = 957 x 2.08/7 = 284 m/s
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