Question 1

A water tank is filled to a depth of 10 m and the tank is 20 m above ground.The water pressure at ground level in a hose 2 cm in diameter is closest to:

Accepted Answer

A) 3.9 × 105 N/m2 
B) 2.0 × 104 N/m2 
C) 9.2 N/m2 
D) The cross-sectional area of the tank is needed. 
A) 3.9 × 105 N/m2 
B) 2.0 × 104 N/m2 
C) 9.2 N/m2 
D) The cross-sectional area of the tank is needed.

Question 2

The density of material at the center of a neutron star is approximately 1.00 × 1018 kg/m3.Calculate the mass of a cube of this material that is 1.76 microns on each side.One micron is equal to 1 × 10-6 m.

Accepted Answer

A) 5.45 kg 
B) 4.74 kg 
C) 6.16 kg 
D) 6.70 kg 
A) 5.45 kg 
B) 4.74 kg 
C) 6.16 kg 
D) 6.70 kg

Question 3

The tires of a car support the weight of a stationary car.If one tire has a slow leak,the air pressure within the tire will _______ with time,the surface area between the tire and the road will ________ with time,and the net force the tire exerts on the road will ___________ with time.

Accepted Answer

A) decrease,increase,remain constant 
B) decrease,increase,decrease 
C) decrease,decrease,decrease 
D) increase,increase,increase 
E) decrease,increase,increase 
A) decrease,increase,remain constant 
B) decrease,increase,decrease 
C) decrease,decrease,decrease 
D) increase,increase,increase 
E) decrease,increase,increase

Question 4

Water is pumped out of a well at 5.000 m/s through a 8.000 cm diameter hose.The well is 30.00 ft deep.What power is needed by the pump?

Accepted Answer

A) 2253 W 
B) 230 W 
C) 6894 W 
D) The area of the well is needed. 
A) 2253 W 
B) 230 W 
C) 6894 W 
D) The area of the well is needed.

Question 5

In England in the Middle Ages an extensive system of canals was used for transportation.Some of these canals crossed over canyons by flowing over bridges (viaducts).Suppose that a heavily loaded barge crossed over such a waterway bridge.

Accepted Answer

A) The force downward on the bridge would increase because of the added weight of the barge. 
B) The force on the bridge would not change when the barge passed over. 
C) The force on the barge would become less because some water would be squeezed off of the bridge. 
D) The force on the bridge would become less because of the buoyancy effect of the water on the barge. 
E) Whether or not the force on the bridge would increase or decrease would depend on whether the water was flowing or stationary. 
A) The force downward on the bridge would increase because of the added weight of the barge. 
B) The force on the bridge would not change when the barge passed over. 
C) The force on the barge would become less because some water would be squeezed off of the bridge. 
D) The force on the bridge would become less because of the buoyancy effect of the water on the barge. 
E) Whether or not the force on the bridge would increase or decrease would depend on whether the water was flowing or stationary.

Question 6

A tire of an automobile has a gauge pressure of 30 psi at the top of a mountain,and the air temperature inside the tire is 300 K.The atmospheric pressure at the top of the mountain is 0.7 atm.The car is driven down to sea level,where the atmospheric pressure is 1.0 atm,and the air inside the tire is heated to 350 K.At sea level,assuming no leaks,the gauge pressure of the tire will be

Accepted Answer

A) lower. 
B) higher. 
C) the same. 
A) lower. 
B) higher. 
C) the same.

Question 7

-A pressurized cylindrical tank,5.0 m in diameter,contains water that emerges from the pipe at point C,with a velocity of 13 m/s.Point A is 10 m above point B and point C is 3 m above point B.The area of the pipe at point B is 0.08 m2 and the pipe narrows to an area of 0.04 m2 at point C.Assume the water is an ideal fluid in laminar flow.The density of water is 1000 kg/m3.In the figure,the mass flow rate in the pipe is closest to:

Accepted Answer

A) 520 Kg/s 
B) 470 Kg/s 
C) 420 Kg/s 
D) 360 Kg/s 
E) 310 Kg/s 
A) 520 Kg/s 
B) 470 Kg/s 
C) 420 Kg/s 
D) 360 Kg/s 
E) 310 Kg/s

Question 8

A tank of water at rest is 2.0000 m deep.It is then accelerated at 5.0000 m/s2 parallel to the original water surface,so that the front edge of the water in the tank is lowered to 1/2 its original value.What is the water pressure in the tank at the bottom back edge?

Accepted Answer

A) 29,430.0013 N/m2 
B) 9 N/m2 
C) 9810.00042 N/m2 
D) The length of the tank is needed. 
A) 29,430.0013 N/m2 
B) 9 N/m2 
C) 9810.00042 N/m2 
D) The length of the tank is needed.

Question 9

-In the figure,fluid fills the container shown here.At which of the indicated points is the pressure greatest?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) The pressure is the same at each of the labeled points. 
A) A 
B) B 
C) C 
D) D 
E) The pressure is the same at each of the labeled points.

Question 10

A submarine in neutral buoyancy is 100 m below the surface of the water.What air pressure must be supplied to remove water from the ballast tanks in order for the submarine to surface?

Accepted Answer

A) 9.9 × 105 N/m2 
B) 9.8 × 105 N/m2 
C) 4.9 × 105 N/m2 
D) The cross-sectional area of the tank is needed. 
A) 9.9 × 105 N/m2 
B) 9.8 × 105 N/m2 
C) 4.9 × 105 N/m2 
D) The cross-sectional area of the tank is needed.

Question 11

If a uniform sphere is compressed to half of its original diameter,its mass remains the same but its density becomes 8 times as great.

Accepted Answer

A) True 
 B)False

Question 12

A venturi is constructed of a 9.0 cm diameter pipe with a 2.0 cm diameter throat.Water pressure in the pipe is twice atmospheric pressure and it flows with a velocity of 0.30 m/s. What is the pressure in the throat?

Accepted Answer

A) 1.8 atm 
B) 0.18 atm 
C) 2.2 atm 
D) 2.0 atm 
A) 1.8 atm 
B) 0.18 atm 
C) 2.2 atm 
D) 2.0 atm

Question 13

A house is supported equally on 18 pilings each with a 0.5 m2 area at the base.The soil can withstand 5 psi.What could be the maximum mass of the house?

Accepted Answer

A) 3.2 × 104 kg 
B) 6.3 × 104 kg 
C) 8.0 × 104 kg 
D) 1.6 × 104 kg 
A) 3.2 × 104 kg 
B) 6.3 × 104 kg 
C) 8.0 × 104 kg 
D) 1.6 × 104 kg

Question 14

A 9.8 kg solid sphere,made of metal whose density is 3000 kg/m3,is suspended by a cord.The sphere floats when placed in a liquid of density 4200 kg m3.The fraction of the volume of the sphere that is submerged is closest to:

Accepted Answer

A) 0.71 
B) 0.73 
C) 0.75 
D) 0.69 
E) 0.67 
A) 0.71 
B) 0.73 
C) 0.75 
D) 0.69 
E) 0.67

Question 15

How many grams of ethanol (specific gravity 0.80)should be added to 5 grams of chloroform (specific gravity 1.50)if the resulting mixture is to have a specific gravity of 1.20?

Accepted Answer

A) 2.0 g 
B) 2.4 g 
C) 1.8 g 
D) 4.4 g 
E) 1.6 g 
A) 2.0 g 
B) 2.4 g 
C) 1.8 g 
D) 4.4 g 
E) 1.6 g

Question 16

A long vertical metal cylinder is filled with oil.If a piston pushes on the top of this cylinder and increases the pressure there by 6,000 Pa,the pressure at the bottom will increase considerably more due to the weight of the oil.

Accepted Answer

A) True 
 B)False

Question 17

-A container has a vertical tube,whose inner radius is 12.00 mm,connected to it at its side.An unknown liquid reaches level A in the container and level B in the tube-level A being 5.0 cm higher than level B.The liquid supports a 20.0 cm high column of oil,between levels B and C,whose density is 320 kg/m3.In the figure,the gauge pressure at level B is closest to:

Accepted Answer

A) 630 Pa 
B) 310 Pa 
C) 470 Pa 
D) 790 Pa 
E) 940 Pa 
A) 630 Pa 
B) 310 Pa 
C) 470 Pa 
D) 790 Pa 
E) 940 Pa

Question 18

If the gauge pressure at a certain depth in Lake Michigan is 3.5 atmospheres,the absolute pressure at that depth is 4.5 atm.

Accepted Answer

A) True 
 B)False

Question 19

When an object is floating,the buoyant force on it is just equal to its weight.

Accepted Answer

A) True 
 B)False

Question 20

A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool).If some of the cargo is thrown overboard,the level of water in the lock will

Accepted Answer

A) rise. 
B) drop. 
C) stay the same. 
D) rise,provided it is lumber that is thrown overboard. 
E) rise,provided it is iron ore that is thrown overboard. 
A) rise. 
B) drop. 
C) stay the same. 
D) rise,provided it is lumber that is thrown overboard. 
E) rise,provided it is iron ore that is thrown overboard.

Exam 13: Fluids

A water tank is filled to a depth of 10 m and the tank is 20 m above ground.The water pressure at ground level in a hose 2 cm in diameter is closest to:

The density of material at the center of a neutron star is approximately 1.00 × 1018 kg/m3.Calculate the mass of a cube of this material that is 1.76 microns on each side.One micron is equal to 1 × 10-6 m.

The tires of a car support the weight of a stationary car.If one tire has a slow leak,the air pressure within the tire will _______ with time,the surface area between the tire and the road will ________ with time,and the net force the tire exerts on the road will ___________ with time.

Water is pumped out of a well at 5.000 m/s through a 8.000 cm diameter hose.The well is 30.00 ft deep.What power is needed by the pump?

In England in the Middle Ages an extensive system of canals was used for transportation.Some of these canals crossed over canyons by flowing over bridges (viaducts).Suppose that a heavily loaded barge crossed over such a waterway bridge.

A tank of water at rest is 2.0000 m deep.It is then accelerated at 5.0000 m/s2 parallel to the original water surface,so that the front edge of the water in the tank is lowered to 1/2 its original value.What is the water pressure in the tank at the bottom back edge?

-In the figure,fluid fills the container shown here.At which of the indicated points is the pressure greatest?

A submarine in neutral buoyancy is 100 m below the surface of the water.What air pressure must be supplied to remove water from the ballast tanks in order for the submarine to surface?

If a uniform sphere is compressed to half of its original diameter,its mass remains the same but its density becomes 8 times as great.

A venturi is constructed of a 9.0 cm diameter pipe with a 2.0 cm diameter throat.Water pressure in the pipe is twice atmospheric pressure and it flows with a velocity of 0.30 m/s. What is the pressure in the throat?

A house is supported equally on 18 pilings each with a 0.5 m2 area at the base.The soil can withstand 5 psi.What could be the maximum mass of the house?

A 9.8 kg solid sphere,made of metal whose density is 3000 kg/m3,is suspended by a cord.The sphere floats when placed in a liquid of density 4200 kg m3.The fraction of the volume of the sphere that is submerged is closest to:

How many grams of ethanol (specific gravity 0.80)should be added to 5 grams of chloroform (specific gravity 1.50)if the resulting mixture is to have a specific gravity of 1.20?

A long vertical metal cylinder is filled with oil.If a piston pushes on the top of this cylinder and increases the pressure there by 6,000 Pa,the pressure at the bottom will increase considerably more due to the weight of the oil.

If the gauge pressure at a certain depth in Lake Michigan is 3.5 atmospheres,the absolute pressure at that depth is 4.5 atm.

When an object is floating,the buoyant force on it is just equal to its weight.

A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool).If some of the cargo is thrown overboard,the level of water in the lock will

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The density of material at the center of a neutron star is approximately 1.00 × 10¹⁸ kg/m³.Calculate the mass of a cube of this material that is 1.76 microns on each side.One micron is equal to 1 × 10^-6 m.

The tires of a car support the weight of a stationary car.If one tire has a slow leak,the air pressure within the tire will _ with time,the surface area between the tire and the road will with time,and the net force the tire exerts on the road will _____ with time.

A tank of water at rest is 2.0000 m deep.It is then accelerated at 5.0000 m/s²parallel to the original water surface,so that the front edge of the water in the tank is lowered to 1/2 its original value.What is the water pressure in the tank at the bottom back edge?

A house is supported equally on 18 pilings each with a 0.5 m² area at the base.The soil can withstand 5 psi.What could be the maximum mass of the house?

A 9.8 kg solid sphere,made of metal whose density is 3000 kg/m³,is suspended by a cord.The sphere floats when placed in a liquid of density 4200 kg m3.The fraction of the volume of the sphere that is submerged is closest to: