E2 e1 b e2 e1 c e2 2 e1 d e2 e1 92 the velocity

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Unformatted text preview: n the object Page 13 of 15 ©Prep101 87. An object is attached to a horizontal spring. It is intentionally displaced by a given distance from equilibrium. If I release the spring, and allow the displacement to ½ without interference, the total energy of the system changes from E1 to E2 with: a. E2 = E1 b. E2 = ½ E1 c. E2 = 2 E1 d. E2 = ¼ E1 92. The velocity of an ultrasound wave is 1480 m/s in water and 1540 m/s in soft tissue. A beam of ultrasound in water arrives at the interface between water and soft tissue at an angle of incidence θi = 35.0°. What is the angle of refraction in the soft tissue? a. 42.6o b. 53.6o c. 36.6o d. 22.6o 88. An object with mass 6 kg is connect to a spring with a spring constant of 42.5 N/m. The object oscillates on a frictionless horizontal surface. If the spring is compressed from 0 to 12 cm and released from rest determine the maximum speed of the object. a. 0.350 m/s b. 0.320 m/s c. 0.290 m/s d. 0.380 m/s 93. An object is placed 3mm in front of a positive (converging) lens of focal length 2.7 mm. What is the magnification of the image? a. -3 b. 3 c. -9 d. 9 89. Two of the resonant frequencies of a closed pipe are 204 Hz and 476 Hz. If the speed of sound in air is 340 m/s, what is the shortest length of pipe consistent with this data? a. b. c. d. 1.5 m 2.0 m 2.25 m 1.25 m 90. A 2.0 kg block of wood is floating in water. It is found that a downward thrust of 10.0 N submerges the block an additional 10 cm, at which point it is let loose to oscillate up and down. Assuming the motion is simple harmonic and undamped, What is the frequency of the motion? a. b. c. d. 2.3 Hz 1.5 Hz 1.1 Hz 3.1 Hz 94. A small sphere with a charge of -2.0 µC and a mass of 50g hangs from a thin wire of negligible mass. A second sphere of charge 3.0 µC is brought close to the hanging sphere causing the wire to form an angle of 20.00 with the vertical. What will be the separation of the charges when the spheres come to rest in m? a. 1.12 b. 0.59 c. 0.30 d. 0.55 95. X-rays of wavel...
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This note was uploaded on 03/23/2011 for the course CHEM 100 taught by Professor Vallis during the Spring '11 term at Dalhousie.

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