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105 - exam 4 - Fall 2007 - solutions

# 105 - exam 4 - Fall 2007 - solutions - Fall 2007 Physics...

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Problem 3. When divers come up from the bottom of the pool, they experience a buoyancy force in the oil that is _________ the buoyancy force they felt in the water. The density of the fluid they displace is less, so buoyant force is less. Problem 4. Two pistons push on hydraulic fluid at rest. The diameter of the left piston is 5 cm. The diameter of the right piston is 1.3 cm. If the force on the left is 1000 N, the force on the right will be _________ N. Pressure is constant 1 2 1 2 2 2 2 2 1 2 1 1 1000 F F P A A A r F F A r = = = = 1000*1.3^2/5^2 = 67.60 N Problem 5. When an object is floating at rest, the buoyant force is _____ the object’s weight. a. greater than b. less than c. the same as Choice c. (from Newton’s 2 nd Law, object is in equilibrium)
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