1. The problem statement, all variables and given/known data Birds of prey rise up and down on thermals. A bird completes circle of radius 8m every 5s and rises vertically at a rate of 3.0 m/s. Assume uniform acceleration. Find a)speed of bird relative to ground b)magnitude of acceleration c)direction of birds acceleration d)angle between birds velocity vector and horizontal. 2. Relevant equations ar=V^2/R 3. The attempt at a solution I have found the answer to a be 10.5 m/s, the answer to b is 12.6 m/s^2 c)at/ar=tan^-1(3/12.6)=13.3 degrees d) I'm not sure how to proceed for this equation. Any help is greatly appreciated and thank you for your time.