Physics Fluid Test
A hydraulic arrangement consists of a water filled U-tube that is wider on one end than the other. To multiply an input force, the input end should be the one having the ____
Smaller-diameter piston
The pressure at the bottom of a jug filled with water does not depend on the ...
Surface area of the water
Which of the following statements about completely submerged objects resting on the ocean bottom is correct?
The buoyant force acting on the object is equal to the object's weight
Which of the following statements about floating objects is true?
The buoyant force equals the object's weight
What happens when a person blows between two paper cups that are hung by strings 10 cm apart?
The cups move toward each other
If an object is only partially submerged in a fluid which of the following is true?
The density of the fluid is greater than the density of the object
An ideal fluid flows through a pipe made of two sections with diameters of 1 cm and 3 cm, respectively. By what factor would you have to multiply the velocity of the liquid flowing through the 1 cm section to obtain the velocity of liquid flowing through the 3 cm section.
1/9
In a hydraulic device, the output piston has 100 times the cross section area as the input piston. This means the device will multiply force ____
100 times
A force of 230 N applied on a hydraulic lift raises an automobile weighing 6500 N. If the applied force is exerted on a 7.0 m ^2 piston, what is the area of the piston beneath the automobile
2.0 x 10^2 m^2
The gauge pressure for the air in a balloon equal 1.01 x 10^5 Pa. If atmospheric pressure is equal to 1.01 x 10^5 Pa, what is the absolute pressure of the air inside the balloon?
2.02 x 10^5 Pa
A water tunnel has a circular cross section where the diameter diminishes from 3.6 m to 1.2 cm. If the velocity of water is 3.0 m/s in the larger part of the tunnel, what is the velocity of water in the smaller part of the tunnel?
27 m/s
A water bed that is 1.5 m wide and 2.5 m long weights 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?
280 Pa
According to legend, to determine whether the king's crown was made of pure gold, Archimedes measured the crown's volume by determine how much water it displaced. The density of old is 19.3 g/cm^3. If the crown's mass was 6.00 x 10^2 g, what volume of water would have been displaced if the crown was indeed made of pure gold?
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?
7.65 N
How does a liquid differ from gas?
A liquid has definite volume, unlike gas
An umbrella tends to move upward on a windy day because ...
A low pressure area is created on top of the umbrella
Bernoulli's principle really comes from...
Conservation of energy
What factors affect the gauge pressure within a fluid?
Fluid density, depth, free-fall acceleration
Which of the following is a fluid?
Helium
Bernoulli's principle says that
Internal fluid pressure decreases as the fluid speed increases
Lobsters live on the bottom of the ocean. The density of the lobster...
Is greater than the density of the seawater
For incompressible fluids, density changes little with changes in...
Pressure
Which of the following statements is true according to Pascal's principle?
Pressure in the fluid is the same throughout the fluid
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?
Pressure increases as the pipe diameter increase
The reason an iron ship doesn't sink is that ...
The iron displaces more water than it would if it were in a solid block
A buoyant force acts in the opposite direction of gravity. Therefore, which of the following is true of an object completely submerged in water?
The net force on the object is smaller than the weight of the object
Why does the lift on an airplane wing increase as the speed of the airplane increases?
The pressure above the wing becomes less than the pressure below the wing
Where is the pressure greater, one meter beneath the surface of Lake Michigan or one meter beneath the surface of a swimming pond?
The pressure is approximately the same in both places
Why does an ideal fluid move faster through a pipe with decreasing diameter?
The pressure within the fluid decreases
Which of the following properties is not a characteristic of an ideal fluid?
Turbulent flow
Archimedes' principle says that an object is buoyed up by a force that is equal to the...
Weight of the fluid displaced
Which of the following statements is always true? a. 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 c. Pressure always increases when force decreases or the area acted on increases d. 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
The lift that supports an airplane wing is a consequence of a. Bernoulli's principle b. Newton's third law c. both A and B d. none of the above
c. both A and B (Bernoulli's principle & Newton's third law)
Pressure in a liquid depends on the...
depth of the measuring point & density of the liquid
The air in your classroom has a. mass b. energy c. temperature d. weight e. all of the above
e. all of the above