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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?
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?
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?
d. 1.5 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?
d. 2.3 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?
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.
- Spring '11