Chapter
-~13-14 Study Guide
Equations will not be provided on the test. You may to make a 3 x5'" note card (FRONT SIDE ONLY)to use on
the test. Your card must be HANDWRITTEN, no photocopies. You cannot have the same card as anyone else.
8
1) Katie and Kellyhave lost Travis while hiking in the woods. They yell out "TRAVIS!"and hear
an echo 2.6 seconds after they shout. If the temperature is 2r C,how far away is the
mountain that reflected the sound wave? (45Om)
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2) At rest a car's horn sounds the note A (440. Hz). While the car is movingdown the street,
the horn is sounded. A bicyclist movingin the same direction with 1/3 the car's speed hears
the note A-flat (415 Hz). How fast is the car moving?Is the cyclist ahead of the car or
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string will results in a second harmonic of 460 Hz? (810N)
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pipe open at both ends has a fundamental frequency of 300. Hz when the temperature is
O.O°C. (a) What is the length of the pipe? (b) What is the fundamental frequency at a
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temperature of 30.0°C? (0552m, 316Hz)
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5) A piano tuner strikes a 440. Hz tuning fork at the instant she strikes a piano key that should
emit a tone of 440. Hz and hears a beat frequency of 2 Hz. What are the possible
frequencies the piano key could be emttting? (438 Hz & 442 Hz)
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6) A commuter train posses a passenger platform ata constant speed of 40.0 m/s, The train
horn is sounded at a frequency of 320 Hz when the train is at rest. (a) What is the
frequency observed by a person on the plntform as' the train approaches and (b) as the
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train recedes from him? (c) What wavelength does the observer find in each case? Assume
the speed of sound is 345 m/s, (360Hz, 290Hz, oss« 12m)
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---7) A typical sound level for a buzzing mosquito is 40. dB, and normal quiet conversation is 55
dB. Howmany buzzing mosquitoes will produce a sound intensity equal to that of a normal
conversation? (32 mosquitoes)
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8) A spring is hung from the ceiling, and an object is attached to the lower end stretches the
spring a distance of 5.00 em from "the un-stretched position. If the spring constant is 47.5
N/m, what is the mass of the object? (0.242kg)
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9) A 3.5 m long pendulum clock that wor 5 perfectly on Ear . IS token to the moon. Will it run
fast or slow there? What is the period of the dock on the moon where the free fall
acceleration is 1.63 m/s2? (???; 9.2sec)
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