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Figure 13-27 gives the gravitational acceleration ag for four planets as a function of the radial distance r from the center of the planet, starting at the surface of the planet (at radius R1*R2, R3 or R4). Plots 1 and 2 coincide for r ≥ R2 plots 3 and 4 coincide for r ≥ R4. Rank the four planets according to (a) mass and (b) mass per unit volume, greatest first.
Figure 13-27 Question 8.
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