What mass of sand be put on the raft

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Q. A wooden raft has a mass of 83 kg. When empty it floats in water (density 1000 kg/m3) with 65% of its volume submerged. What mass of sand can be put on the raft without it sinking?

Q. An object is 22 cm in front of a diverging lens that has a focal length of -13 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 4.0?

Reference no: EM1346436

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