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Q. A plane flies from base camp to Lake A, 340 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 240 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp.

Q. Three children, each of weight 36 kg, make a log raft by lashing together logs of diameter 0.3 m and length 1.8 m. How many logs will be needed to keep them afloat? Consider the density of wood to be 842 kg/m3. Density of water = 1 x 103 kg/m3

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