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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 10m every 6s and rises vertically at a rate of 4.0 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 got answers for a to c. a) 11.2 m/s b) 11 m/s^2 c) 0°

But I cant really figure out how i can measure the angle.

Could it be tan-1 = 4/11.2 = 19.65?

God in the past few days I have been dreaming about angles.

Please help me.

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# Homework Help: Birds in uniform cirular motion

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