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<strong>Quiz</strong> , <strong>Ch</strong> <strong>15</strong><br />
1. A container is filled with oil and fitted on both ends with pistons. The area<br />
of the left piston is 10 mm 2 ; that of the right piston 10,000 mm 2 . What force<br />
must be exerted on the left piston to keep the 10,000-N car on the right at<br />
the same height?<br />
a. 10 N<br />
b. 100 N<br />
c. 10,000 N<br />
d. 10 6 N<br />
e. 10 8 N<br />
f. insufficient information<br />
2. Two cups are filled to the same level with water. One of the two cups has<br />
ice cubes floating in it. Which weighs more?<br />
a. The cup without ice cubes.<br />
b. The cup with ice cubes.<br />
c. The two weigh the same.<br />
3. A piece of lead is fastened on top of a large solid piece of Styrofoam that<br />
floats in a container of water. Because of the weight of the lead, the water<br />
line is flush with the top surface of the Styrofoam. If the piece of Styrofoam<br />
is turned upside down so that the piece of lead is now suspended<br />
underneath it,<br />
a. the arrangement sinks.<br />
b. the water line is below the top surface of the Styrofoam.<br />
c. the water line is still flush with the top surface of the Styrofoam.<br />
4. Consider an object that floats in water but sinks in oil. When the object<br />
floats in water, half of it is submerged. If we slowly pour oil on top of the<br />
water so it completely covers the object, the object<br />
a. moves up.<br />
b. stays in the same place.<br />
c. moves down.
5. Two hoses, one of 20-mm diameter, the other of <strong>15</strong>-mm diameter are<br />
connected one behind the other to a faucet. At the open end of the hose,<br />
the flow of water measures 10 liters per minute. Through which pipe does<br />
the water flow faster?<br />
a. the 20-mm hose<br />
b. the <strong>15</strong>-mm hose<br />
c. The flow rate is the same in both cases.<br />
d. The answer depends on which of the two hoses comes first in the flow.<br />
6. A hole is punched in a full milk carton, 10 cm below the top. What is the<br />
initial velocity of outflow?<br />
a. 1.4 m/s<br />
b. 2.0 m/s<br />
c. 2.8 m/s<br />
d. 3.9 m/s<br />
e. 2.8 m/s<br />
7. Water is flowing at 4.0 m/s in a circular pipe. If the diameter of the pipe<br />
decreases to 1/2 its former value, what is the velocity of the water downstream?<br />
a. 1.0 m/s<br />
b. 2.0 m/s<br />
c. 8.0 m/s<br />
d. 16 m/s<br />
e. 4.0 m/s<br />
8. Two identical glasses are filled to the same level with water. One of the<br />
two glasses has ice cubes floating in it. When the ice cubes melts, in<br />
which glass is the level of the water higher?<br />
a. The glass without ice cubes.<br />
b. The glass with ice cubes.<br />
c. It is the same in both.
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