Problem: The earth orbits the sun once a year (3.16 x 10^7 s) in a nearly circular orbit of radius 1.5 x 10^11 m. With respect to the sun, determine (a) the angular speed of the earth, (b) the tangential speed of the earth, and (c) the magnitude and direction of the earth's center centripetal acceleration.(adsbygoogle = window.adsbygoogle || []).push({});

My Approach:

(a) Finding Velocity:

V = (1.5 x 10^11 m)/(3.16 x 10^7 s) =4747 m/s

--I did this because I'm assuming the earth's orbit of the sun is constant

(b) Tangential Speed:

V = rw = (1.5 x 10^11 m) (4747 m/s) =7^14 .12 x 10m/s

(c) Find Centripetal Acceleration:

a(centripetal) = (V tangential)^2 / (radius) = (7.12 x 10^14 m/s)^2 / (1.5 x 10^11 m) =3.38 x 10^18 m/s^2

Please check my work and point out a quick way to fix something. I know this can be easy for any physics expert, but im just a beginner-so help me in simple terms

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Centripetal and Tangitial Accelerations: Some Help please!

**Physics Forums | Science Articles, Homework Help, Discussion**