To determine the number of rotations per minute (RPM) of a wheel, you can use the following formula: RPM = (60 x speed) / (pi x diameter). In this case, the speed would be 20 feet per second and the diameter would be 26 inches. First, we need to convert the speed from feet per second to inches per minute, which can be done by multiplying by 60 (since there are 60 seconds in a minute). So the speed would be 20 x 60 = 1200 inches per minute. Then, plug in the values into the formula: RPM = (60 x 1200) / (pi x 26) = 138.46 rotations per minute.
To determine the angular velocity, you can use the formula: angular velocity = (2 x pi x RPM) / 60. In this case, the RPM would be 138.46, so the formula would be: angular velocity = (2 x pi x 138.46) / 60 = 14.51 radians per second. This formula calculates the angular velocity in radians per second, but you can convert it to degrees per second by multiplying by 180/pi.
I hope this helps you find the RPM and angular velocity of your wheel. Remember to always double check your units and make sure they are consistent throughout the calculation.