When tuning a piano, a technician strikes a tuning fork for the A above middle C and sets up a wave motion that can be approximated by
?
y = 0.001 sin 850?t,
?
wheret is the time (in seconds).
?
The frequency is given by f = 1 / p. What is the frequency of the note?
?
A. 85 cycles/sec
B. 
cycles/sec
C. 
cycles/sec
D. 850 cycles/sec
E. 425 cycles/sec
Answer: E
Mathematics
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