Circular Motion. Chapter 7 (already). We commonly use Cartesian or rectangular coordinate system where (x, y) identifies a point in two dimensions. We could equivalently use polar coordinates to identify a point (r, θ ). Polar Coordinates. Given r and θ , X = r·cos θ Y = r·sin θ
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Chapter 7 (already)
We could equivalently use polar coordinates to identify a point (r, θ)Polar Coordinates
Which variables change and which stay the same?Circular Motion
The coordinates x- and y- both change.
The speed does not change but the velocity does change (why?)Circular Motion
ω = Δθ/ Δt [radians/sec]
and θ = ωt
Then s = rθ becomes s = r (ωt)
RE = 6.4 X 106 km;
ME = 6.0 X 1024 kg,
T = 365 days