1) If you double the pressure on the surface of a can of water. the buoyant forc
ID: 1299616 • Letter: 1
Question
1) If you double the pressure on the surface of a can of water. the buoyant force on a stone placed in that water will A) increase, but not double. B) double. C) decrease, but not by one-half. D) not change. 2) A 50-cm^3 block of wood is floating partially submerged in water, and a 50-cm^3 block of iron is totally submerged in water. Which block has the greater buoyant force on it? A) the wood B) the iron C) Both have the same buoyant force. D) The answer cannot be determined without knowing the densities of the blocks. 3) The two water reservoirs shown in the figure are open to the atmosphere. and the water has density 1000 kg/m^3. The manometer contains incompressible mercury with a density of 13.600 kg/m3. What is the difference in elevation h if the manometer reading in is 25.0 cm?Explanation / Answer
1) D ( the weight of water displaced by stone will remain same. hence the force of boyancy will be same)
2) B ( iron has displaced 50 cm 3 water, while wood has displaced less than 50 cm3. hence iron has displaced more water and hence more boyant force is acting on it.)
3) density of mercury is 13.6, water has density of 1g/cm3 . . . 1 cm of mercury can have pressure equal to 13.6 cm of water column. 25 cm will have 25* 13.6 = 340 cm = 3.4 meter. Hence option D
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