Steve hears a siren emitting a frequency of 10 kHz when it is at rest. What frequency will Steve hear if the siren moves toward him at 30 m/s? Assume the speed of sound is 340 m/s. Answer options are:

a. 11 kHz

b. 10 kHz

c. 0 kHz

d. 9 kHz

The board sandwiched between two other boards shown below weighs 87.5 n. if the coefficient of friction between the boards is 0.

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