Question
Asked Nov 13, 2019
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A baseball is thrown by a pitcher at 95 mph through standard air. The diameter of the baseball is 2.82 in. Estimate the drag force on the baseball.
[Answer in units of lbs.]
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Expert Answer

Step 1

Given information:

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2.82 ft 12 Diameter of baseball D = 2.82 in Speed of ball U = 95 mph 5280 U 95x 3600 ft/s 139.33 ft/s

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Step 2

From physical properties of air at T = 600F

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velocity of air (var ) = 1.58x 10 ft2 /s Density of air (p) = 2.373 x 10 slugs/ft Reynolds number UD Re= 2.82 139.33x 12 1.58x10 = 2.07 x 10 Re

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Step 3

Assuming sphere to be smooth, the drag coefficient can be obtained for the sphere corr...

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For Re 2.07x10' and for smooth sphere the drag coefficient (CD) 0.5

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