In a physics class, a 2.70-g ping-pong ball was suspended from a massless string. The string makes an angle of θ = 15.0° with the vertical when air is blown horizontally at the ball at a speed of 20.5 m/s. Assume that the friction force is proportional to the squared speed of the air stream.
a) What is the proportionality constant in this experiment?
b) What is the tension in the string?
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