Physics - Chapter 8

A closed vessel can sink to a depth of 20.0 m in water before the external pressure crushes it. to what depth could this same container be immersed in a deep vat of mercury without it being crushed? a. 0.680 m b. 1.47 m c. 15.7 m d. 27.2 m

1.47 m

A water tunnel has a circular cross section where the diameter diminishes from 3.6 m to 1.2 m. If the velocity of water is 3.0 m/s in the larger part the tunnel, what is the velocity of water in the smaller part of the tunnel? a. 9.0 m/s b. 18 m/s c. 27 m/s d. 54 m/s

27 m/s

A force of 230 N applied on a hydraulic lift raises an automobile weighing 6500 N. Id the applied force is exerted on a 7.0 m^2 piston, what is the area of the piston beneath the automobile? a. 2.0 x 10^2 m^2 b. 4.0 m^2 c. 0n25 m^2 d. 0.0050 m^2

a. 2.0 x 10^2 m^2

according to legend, to determine whether the king's crown was made of pure gold, Archimedes measured the crown's volume by determining how much water is displease. The density of gold is 19.3 g/cm^3. If the crown's mass was 6.00 x 10^2 g, what volume of water would have to be displaced of the crown was indeed made of pure gold? a. 31.1 cm^3 b. 1.81 x 10^3 cm^3 c. 22.8 x 10^3 cm^3 d. 114 x 10^3 cm^3

a. 31.1 cm^3

A cube of wood with a density of 0.780 g/cm^3 is 10.0 cm on each side. When the cube is placed in water, what buoyant force acts on the wood? (two possible answers) a. 7.65 x 10^3 N b. 7.65 N c. 6.40 N d. 5.00 N

a. 7.65 x 10^3 N b. 7.65 N

Which of the following is NOT an example of turbulent flow? a. a river flowing slowly in a straight line b. a river flowing swiftly around rocks in rapids c. water flowing unevenly from a filly opened faucet d. smoke twisting as it moves upward from a fire

a. a river flowing slowly in a straight line

What factors affect the gauge pressure within a fluid? a. fluid density, depth, free-fall acceleration b. fluid volume, depth, free-fall acceleration c. fluid mass, depth, free-fall acceleration d. fluid weight, depth, free-fall acceleration

a. fluid density, depth, free-fall acceleration

For an ideal fluid flowing through a horizontal pipe, Bernoulli's principle and the continuity equation state that the pressure within the pipe does which of the following? (assume measurements are taken along the pipe in the direction of fluid flow) a. pressure increases as the pipe diameter increases b. pressure decreases as the pipe diameter increases c. pressure remains constant as the pipe diameter increases d. pressure increases, then decreases at the pipe diameter increases

a. pressure increases as the pipe diameter increases

a buoyant force acts in the opposite direction of gravity. Therefore, which of the following is true of an object completely submerged in water? a. the net force on the object is smaller than the weight of the object b. the net force on the object is larger than the weight of the object c. the net force on the object is equal to the weight of the object d. the object appears to weigh more than it does in air

a. the net force on the object is smaller than the weigh of the object

Which of the following statements is NOT correct? a. a fluid flows b. a fluid has a definite shape c. molecules of a fluid are free to move past each other d. a fluid changes its shape easily

b. a fluid has a definite shape

how does a liquid differ from a gas? a. a liquid has both definite shape and definite volume, whereas a gas has neither b. a liquid has a definite volume, unlike a gas c. a liquid has definite shape, unlike gas d. a liquid has definite shape, whereas a gas has definite volume

b. a liquid has a definite volume, unlike gas

Which of the following is NOT an example of units for expressing pressure? a. N/m^2 b. kg/m^2 c. atm d. PA

b. kg/m^2

Which of the following statements is always true? a. pressure always increases when force increases or the area acted on increases b. pressure always increases when force increases or the area acted on decreases c. pressure always increases when force decreases or the area acted on increase d. pressure always increases when force decreases or the area acted on decreases

b. pressure always increases when force increases or the area acted on decreases

Which of the following statements about completely submerged objects resting on the ocean bottom is correct? a. the buoyant force acting on the object is equal to the object's weight b. the apparent weight of the object depends on the object's density c. the displaced volume of fluid is greater than the volume of the object d. the weight of the object and the buoyant force are equal and opposite

b. the apparent weight of the object depends on the object's density

Which of the following occurs to a person standing near the edge of a railroad track when a high-speed train passes? a. the person tends to be pushed away from the train b. the person tends to be pulled toward the train c. the person tends to be pushed upward in to the air d. the person is unaffected by the train

b. the person tends to be pulled toward the train

what does the difference between gauge pressure and absolute pressure equal? a. pressure within the fluid b. the pressure at the surface of the fluid c. the pressure at the bottom of the fluid d. zero

b. the pressure at the surface of the fluid

What does the net force between two levels in a fluid equal? a. the weight of fluid above the top level b. the weight of the fluid between the levels c. the force applied to the fluid's surface d. the force applied to the fluid's sides

b. the weight of the fluid between the levels

Which of the following properties is not characteristic of an ideal fluid? a. laminar flow b. turbulent flow c. non-viscous d. incompressible

b. turbulent flow

Each of four tires on an automobile has an area of 0.026 m^2 in contact with the ground. The weight of the automobile os 2.6 x 10^4 N. what is the pressure in the tires? a. 3.1 x 10^6 Pa b. 1.0 x 10^6 Pa c. 2.5 x 10^5 Pa d. 6.2 x 10^4 Pa

c. 2.5 x 10^5 Pa

For incompressible fluids, density changes little with changes in... a. depth b. temperature c. pressure d. free-fall acceleration

c. pressure

Which of the following statements is true according to Pascal's principle? a. pressure in a fluid is greatest at the walls of the container holding the fluid b. pressure in a fluid if greatest at the center of the fluid c. pressure in a fluid is the same throughout the fluid d. pressure in a fluid is greatest at the top of the fluid

c. pressure in a fluid is the same throughout the fluid

if the object is only partially submerged in a fluid, which of the following is true? a. the volume of the displaced fluid equals the volume of the object b. the density of the fluid equals the density of the object c. the density of the fluid is greater than the density of the object d. the density of the fluid is less than the density of the object

c. the density of the fluid is greater than the density of the object

Why does the lift on an airplane wing increase as the speed of the airplane increases? a. the pressure behind the wing becomes less than the pressure in front of the wing b. the pressure behind the wing becomes greater than the pressure in front of the wing c. the pressure above the wing becomes less than the pressure below the wing d. the pressure above the wing becomes greater than the pressure below the wing

c. the pressure above the wing becomes less than the pressure below the wing

The gauge pressure for the air in a ballon equals 1.01 x 10^5 Pa. If atmospheric pressure is equal to 1.01 x 10^5, what is the absolute pressure of the air inside the balloon? a. 0 Pa b. 5.05 x10^4 Pa c. 1.01 x 10^5 Pa d. 2.02 x 10^5 Pa

d. 2.02 x 10^5

A water bed that is 1.5 m wide and 2.5 m long weighs 1055 N. Assuming the entire lower surface of the bed is in contact with the floor, what is the pressure the bed exerts on the floor? a. 250 Pa b. 260 Pa c. 270 Pa d. 280 Pa

d. 280 Pa

If the flow rate of liquid is measured at 8.0 x 10^3 m^3/s going through a 20.0 m radius pipe, which of the following is the average fluid velocity in the pipe? a. 4.0 x 10^-2 m/s b. 0.64 m/s c. 2.0 m/s d. 6.4 m/s

d. 6.4 m/s

Which of the following statements about floating objects is correct? a. the object's density is greater than the density of the fluid on which it floats b. the object's density is equal to the density of the fluid on which it floats c. the displaced volume of fluid is greater than the volume of the object d. the buoyant force equals the object's weight

d. the buoyant force equals the object's weight

When a gas is poured out of one container into another container, which of the following does not occur? a. the gas flows into the new container b. the gas changes shape to fit the new container c. the gas spreads out to fill the new container d. the gas keeps its original volume

d. the gas keeps it original volume

Which of the following is not a fluid? a. carbon dioxide b. hydrogen c. seawater d. wood

d. wood