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A truck with 48-in.-diameter wheels is traveling at 50 mi/h.
Find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes:
How many revolutions per minute do the wheels make?
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1 mile = 5280 feet = 5280*12 inches = 63360 inches.
The wheel circumference is inches = 3.14159265*48 inches = 150.7964472 inches.
The number of revolutions of the wheel per minute is rpm = = 350.1408752.
Solved.
The formulas are self-explanatory.