# physics

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The diameter of the earth is about 7.6 x 10^3 miles. What is the linear velocity of a person, on the equator, in feet per second?

• physics -

R = (7.6/2)(10^3 miles) (5280 ft/mile)
R = 20*10^6 ft
w =angular velocity= 2 pi radians in 24 hours
w = (2 pi rad/24hr)(1 hr/3600sec)
v = w R = 7.27*10^-5 * 2*10^7
= 1450 ft/s

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