What is the speed of the earth as it orbits the sun in km/hr? In m/s? Orbital radius =1.5x10^11m)

Question

What is the speed of the earth as it orbits the sun in km/hr? In m/s? Orbital radius =1.5x10^11m)

Answer 1

The speed of the earth v = rw where v = speed, r = radius of orbit, & w = angular velocity

r = 1.5 x 10¹¹ m

w = 2pi/365 days x 1 day/24 hours x 1 hour/60 sec = 1.99 x 10^-7radians/sec

So, v = rw = (1.5 x 10¹¹ m)(1.99 x 10^-7 rad/sec) = 2.99 x 10⁴ m/sec = 1.0759 x 10⁵ km/hr