The angular speed of the wheel is 3960 rad/min and the revolutions per minute is 630 rpm.
The velocity of the truck is 60 mph. We need to convert this speed to inches per minute.
1 mile = 63360 in, 1 hour = 60 minutes
Hence:
60 mph = (60 mile * 63360 in/mi) / (1 hr * 60 min/hr) = 63360 in/min
The diameter = 32 in, hence radius = 32/2 = 16 in
The angular speed = 63360 in/min ÷ 16 in = 3960 rad/min
Revolution per minute = 3960 rad/min ÷ 2π = 630 rpm
Hence the angular speed of the wheel is 3960 rad/min and the revolutions per minute is 630 rpm.
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