A Block Holding a Ringing Tuning Fork Is Attached to a Wall

A block holding a ringing tuning fork is attached to a wall by a spring. The block oscillates back and forth on a horizontal, frictionless surface, with amplitude 17 cm. The spring constant is 390 N/m. An observer who is situated so that the block's direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the mass of the tuning fork and block together? The speed of sound is 340 m/s.

A) 4.4 kg
B) 0.76 kg
C) 0.18 kg
D) 2.9 kg

Correct Answer:

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