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# Physics question need help?

(a) What is the period of rotation of Earth in seconds? (b) What is the angular velocity of Earth? (c) Given that Earth has a radius of 6.4×10^6m at its equator, what is the linear velocity at Earth’s surface?

### 1 Answer

- MathguyLv 51 month agoFavorite Answer
First to respond... at least 3 hrs after your post.... Don't forget to choose a Best Answer...

a) A Sidereal Day [ time Earth takes to make ONE complete Rotation compared to the distant stars ] is :

t = 23 hrs 56 min 4.06 sec .... or 86,164.06 sec

( a Solar day is approx 4 min longer as Earth rotates a bit more to point towards the same spot at the Sun ..due to Earth, Sun movement in space )

b) angular velocity , w is w = @/t so 2π / t you do the calculation answer in rad/ sec

c) w = v / r so v = wr again you calculate v

you calculated w, and r was given by you. answer in m / sec