Physics 011

A of PQ#10A

Practice Questions

1.	Which of the following is not a unit of pressure? Your answer: poise
2.	Which of the following is a unit for Bernoulli's equation? The correct answer: J/m^3 Density is used not mass. Review Section 10-8 in Giancoli.
3.	What is an alternate unit for Bernoulli's equation? The correct answer: N/m^2 Review Section 10-10 in Giancoli.
4.	Which of the following is not a unit for surface tension? The correct answer: J/m^3 Review Section 10-12 in Giancoli.
5.	Which of the following is a unit of density? The correct answer: kg/m^3 This is sometimes called surface density but has no application here. Review Section 10-1 in Giancoli.
6.	One kilogram of Iron (density~7.8 gm/cm^3) and 1 kilogram of Aluminum (density~2.7 gm/cm^3) are dropped into a pool. Which has the largest buoyant force on it? The correct answer: Aluminum They don't have the same volume. Review Section 10-6 in Giancoli.
7.	One cubic centimeter of Iron and 1 cubic centimeter of Aluminum are dropped into a pool. Which has the largest buoyant force on it? Your answer: Both are the same.
8.	One gram of Iron and 1 cubic centimeter of Aluminum are dropped into a pool. Which has the largest buoyant force on it? The correct answer: Aluminum A sunken object displaces its volume in water. Review Section 10-6 in Giancoli.
9.	One gram of Oak (density~.8 gm/cm^3) and 1 gm of Aluminum are dropped into a pool. Which has the largest buoyant force on it? Your answer: Oak
10.	One cubic centimeter of Oak and 1 cubic centimeter of Aluminum are dropped into a pool. Which has the largest buoyant force on it? The correct answer: Aluminum The Oak would displace less than 1 cubic centimeter of water. Review Section 10-6 in Giancoli.
11.	Ice (density=.92 gm/cm^3) floats freely in a glass of water. The ice melts. Does the level go up, down or stay the same? Your answer: Stays the same.
12.	Ice in a glass of Alcohol (density=.8 gm/cm^3) melts. Does the level go up, down or stay the same? The correct answer: Down The volume of the water will be less than the Ice. Review Section 10-6 in Giancoli.
13.	You are on a float in a pool using hand weights. The weights fall overboard. Does the pool water level go up, down, or stay the same? The correct answer: Down The floating weight displaces its weight When it sinks it displaces its volume. Review Section 10-6 in Giancoli.
14.	The large beaker in the picture is set up so that the water displaced by the submerging weight overflows into the small beaker. In frame E what are the readings on scales a, b, and c, respectively? The correct answer: 10 N, 1 N, 3 N Review Section 10-6 in Giancoli.
15.	The large beaker in the picture is set up so that the water displaced by the submerging weight overflows into the small beaker. When would scale (a) again read 10 N? Your answer: All of the above.
16.	The large beaker in the picture is set up so that the water displaced by the submerging weight overflows into the small beaker. Which frame would the reading on scale (b) read 0.5 N? The correct answer: C It would have to be half full. Review Section 10-6 in Giancoli.
17.	The large beaker in the picture is set up so that the water displaced by the submerging weight overflows into the small beaker. What is the combined weight of the readings on scales b and c in frames B or C in the animation? The correct answer: 4 N Review Section 10-6 in Giancoli.
18.	The large beaker in the picture is set up so that the water displaced by the submerging weight overflows into the small beaker. When would scale c in the animation read 3.25 N? The correct answer: D Review Section 10-6 in Giancoli.
19.	For the purpose of this problem use 10 m/s^2 for g and 100000 N/m^2 for 1 atm. The pressure at A is 9.5 atm and the water velocity is 10 m/s. What is the water velocity at point C? The correct answer: 10 m/s Review Example 10-12 in Giancoli.
20.	For the purpose of this problem use 10 m/s^2 for g and 100000 N/m^2 for 1 atm. What is the velocity at point B? The correct answer: 2.5 m/s Remember that cross section area goes as the radius squared. Review Example 10-10 in Giancoli.
21.	For the purpose of this problem use 10 m/s^2 for g and 100000 N/m^2 for 1 atm. What is the velocity at point D? The correct answer: 40. m/s Review Example 10-10 in Giancoli.
22.	For the purpose of this problem use 10 m/s^2 for g and 100000 N/m^2 for 1 atm. What is the pressure at point C? The correct answer: 8.5 atm Review Example 10-12 in Giancoli.
23.	For the purpose of this problem use 10 m/s^2 for g and 100000 N/m^2 for 1 atm. What is the pressure at point D? Your answer: 1.0 atm
24.	For the purpose of this problem use 10 m/s^2 for g and 100000 N/m^2 for 1 atm. What is the pressure at point B? Your answer: 9.0 atm
25.	Assuming that the density of air is a constant 1.3 kg/m ^3 and that the air pressure is 30 inches (76 cm) of Hg, what is the pressure at the top of a 500 meter high skyscraper? The correct answer: 28 inches Review Example 10-2 in Giancoli.