The lift coefficient on a rotating sphere is very approximately given by
Here R is the sphere radius and Ω is rotation rate of the sphere. For the baseball in Problem12.17, determine the rotation rate for a baseball thrown at 110 mph to have the lift equal the weight. How many rotations would such a ball make in 60 ft 6 in.?
Problem12.17
A baseball has a circumference of 9¼ in. and a weight of 5¼ ounces. At 95 mph determine
a. the Reynolds number
b. the drag force
c. the type of flow (see the illustration for Problem 12.7)
Problem 12.7
The drag coefficient for a smooth sphere is shown below. Determine the speed at the critical Reynolds number for a 42-mm-diameter sphere in air.
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