T Turner Guest Dec 24, 2008 #1 so if im going 30 mph how many revilutions per minute is the 20 inch bike wheel going
B Beck M Guest Dec 24, 2008 #2 About 504 Here's the math: 30 mph = 1/2 mi /min 126720 inches 1/2 mi = 31680 inches Divide that by the cirumference of the wheel (20*3.14) and you get roughly 504 revolutions
About 504 Here's the math: 30 mph = 1/2 mi /min 126720 inches 1/2 mi = 31680 inches Divide that by the cirumference of the wheel (20*3.14) and you get roughly 504 revolutions
B billrussell42 Guest Dec 24, 2008 #3 20 inch diameter? that is a circumference of 20? or 63 inches. 30 mph is: 30 mi/hr x 1 hr/60 min x 5280 ft/mi x 12 inch/ft = 31680 inch/min 31680 inch/min / 63 in/rev = 503 rev/min or RPM .
20 inch diameter? that is a circumference of 20? or 63 inches. 30 mph is: 30 mi/hr x 1 hr/60 min x 5280 ft/mi x 12 inch/ft = 31680 inch/min 31680 inch/min / 63 in/rev = 503 rev/min or RPM .
S sewerking Guest Dec 24, 2008 #5 Circumference in Feet = pi x D = 3.14159 x 1.66667' = 5.236'. One revolution = 5.236' 30 MPH = 44 Ft Per Second 44 Ft./ sec. x 60 seconds = 2,640 Ft. per minute RPM = 2,640 Ft./ 5.236 Ft. = 504.20
Circumference in Feet = pi x D = 3.14159 x 1.66667' = 5.236'. One revolution = 5.236' 30 MPH = 44 Ft Per Second 44 Ft./ sec. x 60 seconds = 2,640 Ft. per minute RPM = 2,640 Ft./ 5.236 Ft. = 504.20
