20 miles / 50 mph in minutes
1 lightyear / 23 mpg in gallons
(30mm/2)^2 * pi * 50mm in cc
(30mm/2)² π * 50mm in cc
2π radians to degrees
1/2 inch * 50 mm * 80 mm * 7.8 g/cc in oz
G * mEarth / rEarth^2 in m/s^2
31 miles / (4 mile/kWh) * $0.25/kWh
2 miles / 14 kWh in kg