An airplane pulls a 25-kg banner on a cable as depicted in Figure P4.67. When the airplane has a constant cruising velocity, the cable makes an angle θ = 20° with the horizontal. 

(a) What is the drag force exerted on the banner by the air?

(b) The weather changes abruptly and the pilot finds herself in a 20-minute rainstorm. After the storm, she finds that the cable now makes an angle θ_water = 30°. Assuming the velocity and drag force are the same after the storm, find the mass of the water absorbed by the banner’s fabric during the storm.

Figure P4.67

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Reasoning and Relationships