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Q. A wooden raft has a mass of 46 kg. When empty it floats in water (density 1000 kg/m3) with 26% of its volume submerged. What mass of sand can be put on the raft without it sinking?

Q. A 1200kg car rounds a curve of radius 65 m banked at an angle of 14degrees. if the car is traveling at 30km/hr, will a friction force be required? if so, how much and in what direction?

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