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Q. A 20.0 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.10 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle theta_max = 50.0^circ.

Q. A tuning fork produces a sound with a frequency of 238 Hz and a wavelength in air of 1.44 m. What is the temperature of the air?

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