A waiter in a restaurant fills a pitcher full of water and ice so that water wou

Question

A waiter in a restaurant fills a pitcher full of water and ice so that water would spill out if any more were added. As the ice starts to melt: a. the water level in the pitcher remains the same. b. the pressure on the bottom of the pitcher increases. c. the water level in the pitcher falls. d. water starts to flow out the spout of the pitcher. e. the pressure on the bottom of the pitcher decreases A rock weighing 1400 N in air, has an weight of 900 N are submerged in water of density 1000kg/m^3. The buoyant force, and the volume of the rock are respectively a. 100 N, 0.5 m^3 b. 1400N, 0.5m^3 c. 900N, 5m^3 d. 5N, 0.09m^3 e. 500N, 0.05m^3 A stone cutter's chisel has an edge area of 9 times 10^-5 m^2 and the pressure exerted on the stone is 500,000N/m^2 the force on the chisel is a. 45N b. 80N c. 70N d. 32N e. 18N One piston in a hydraulic lift has an area that is twice the area of the other. When the pressure at the smaller increased by Delta p the pressure at the larger piston a. does not change b. increases by Delta p/2 c. increases by 4 Delta p d. increases by Delta p e. increases by 2 Delta p

Explanation / Answer

the water levelin the pitcher falls

option c
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6)

Inair

weight , W = 1400 N

In water

Fb - W = -900 N

Fb - 1400 = -900

buoyancy force Fb = 500 N <<<--answer

buoyancy force Fb = Dwater*V*g

500 = 1000*V*9.8

V = 0.05 m^3

option (e)

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7)

pressure exerted = F/A

Force F = P*A

F = 500000*9*10^-5

F = 45 N

OPTION (a)

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from pascal's law

pressure chnage transmits uniformly

option (d)

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