How fast are you moving right now?

Rotation of the Earth

radius of the earth = Re = 6400 km = 6.4x103 km

1 day = 86400 seconds = 8.64x104 sec

v = d/t = 2?Re/1 day

= 4.0x104 km/day / 8.64x104 s/day

= 4.6x10-1 km/s ~ 1000 mph

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