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Physics Galaxy Discussion | Questions Solutions [work]

g sinθ = 9.8·0.3420 = 3.3516. f = 2.0·(3.3516 − 2.232) = 2.0·1.1196 ≈ 2.239 N (up the plane), static and non-dissipative.

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Work W = η Qh = 0.5 · 1200 = 600 J.

Why do elliptical galaxies have much larger $M/L$ ratios than spiral disks? What does this imply about their formation?

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Explain why an observer in a distant galaxy would see the same relative motion of other galaxies (receding away) as we do on Earth. This is explained by the Homogeneity and Isotropy

Physics Galaxy emphasizes the Impulse-Momentum Equation for variable mass systems. Instead of just using , we look at the system's momentum change. Set up the Equation: The net force . In gravity-free space, Rearrange: Integrate: Integrate from , and from mass M0cap M sub 0 g sinθ = 9

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