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For a simple model of the Galaxy with R0 = 8kpc and V (R) = 220 km s1 everywhere, find Vr(l) for gas in circular

For a simple model of the Galaxy with R0 = 8kpc and V (R) = 220 km s1 everywhere, find Vr(l) for gas in circular orbit at R = 4, 6, 10, and 12 kpc. Do this by varying the Galactocentric azimuth around each ring; find d for each (, R), and hence the longitude l and Vr.

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