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Q1. A plane flies from base camp to Lake A, 230 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 160 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp.

Q2. How to compute for the density of dark matter estimate mass density of dark matter in the solar neighbourhood. Express the answer in units of kg m-3, Msun pc-3, Msun AU-3.

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