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Unformatted text preview: ' l; l and the gun and puck have a combined mass of 120 g. With the system initially at rest, the radio-contrilled trigger > .3. releases the bullet, causing the puck and empty gun to move with a speed of 0.500 m/s. Of the total kinetic energy of W W) the gun-puck—bullet system, what percentage is in the bullet? , (l) 96% (2) 4.0% (3) 50% (4) 100% (5) 30% 28’ 7. Legend says that Archimedes, in determining whether or not the king’s crown was made of pure gold, measured its volume by the water displacement method. If the density of gold is 19.3 g/cm3 and the crown’s mass is 600 g, what volume would be necessary to prove that it is pure gold? @311 cm3 (2) 114 x 103 cm3 (3) 22.8 x 103 cm3 (4) 1.81 x 10‘3 cm3 (5) none of these 1 91’ 8. A SOD—Hz whistle is moved toward a listener at a spwd of 10.0 m/s. At the same time, the listener moves at a speed : of 20.0 m/s in a direction away from the whistle. What is the apparent frequency heard by the listener? (The speed 5‘) VJ) ' of sound is 340 m/s.) ‘ @485 Hz (2) 473 Hz (3) 533 Hz ‘ (4) 547 Hz (5) 323 Hz 5'0 ><If one-third of the members of a symphony orchestra are absent because of head colds, thus reducing the overall , intensity of sound by 33%, what will be the reduction in the decibel level? (1) 1.7 dB (2) 30 dB (3) 3 dB (4) 48 dB (5) 16 dB LIZ, . The intensity level of sound 20 m from a jet airliner is 120 dB. At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.) (1) 200 m (2) 90 m (3) 120 m (4) 150 m (5) 40 m )1"? 12. In an elastic collision between only two objects, which one of the following is a FALSE statement? ‘ 1 The kinetic energy of each object is the same before and after the collision. The total kinetic energy is conserved. \/ (3) The total momentum is conserved. ‘/ (4). V ”’3“ : W . . (5) The total kinetic energy before the collisi n is equal to the total kinetic energy after the collision/ ”A 13. A 7.00 gram bullet is fired horizontally and embeds itself in a 1.60 kg block attached to a spring with spring constant of 21.3 N/m. How far is the spring compressed if the bullet has a speed of 300 m/s before it strikes the block, and the block slides on a horizontal frictionless surface? (TD 0359 m (2) 0.267 m (3) 0.472 m (4) 0.566 m (5) 0.529 m ...
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