WorksheetsAP Physics 1: Fluids
Total questions: 54
Worksheet time: 13hrs 6mins
Bernoulli’s principle states that the pressure in a fluid decreases as its velocity increases.
True
False
What is the pressure difference between points A and B if H= 3 m and R1 = 0.5 m and R2 = 0.2 m and velocity at B is 1 m/s? The pipe is filled with a steady flow of water.
10368 Pa
10533.5 Pa
20788 Pa
10137 Pa
Which relates the speed of a fluid moving through a pipe to the cross - sectional area of the pipe?
Pascal's principle
Bernoulli's principle
Equation of continuity
Conservation of velocity
The figure shows an aero foil. Which of the following statements is TRUE?
V1 is smaller than V2 but P1 is smaller than P2
V1 is greater than V2 but P1 is smaller than P2
V1 is greater than V2 but P1 is greater than P2
Which is TRUE about the continuity equation?
The continuity equation is the result of the application of the law of conservation of mass to the flow field.
The continuity equation is the result of the application of the law of conservation of energy to the flow field.
The continuity equation is the result of the application of the third law of thermodynamics to the flow field.
The continuity equation is the result of the application of the law of viscosity to the flow field.
According to equation of continuity, A1V1 = A2V2 = constant. The constant is equal to:
Flow rate
Volume of fluid
Mass of fluid
Density of fluid
In equation of continuity, the units of Av is given as:
Cubic meter
Cubic meter per second
Square meter per second
Square meter per square second
Water flows through a pipe with different sized cross-sectional areas. Which section has the slowest fluid speed?
I
II
III
IV
The hose nozzle has two settings: one with a small opening and one with a large opening. Which setting will make water spray the farthest?
large opening
small opening
same
Water flows through a pipe whose area is constant but whose height above the ground changes. How does speed v2 compare to v1?
v1 is greater
v2 is greater
both speeds are equal
An ideal fluid is flowing with a speed of 12 cm/s through a pipe of diameter 5 cm. The pipe splits into three smaller pipes, each with a diameter of 2 cm. What is the speed of the fluid in the smaller pipes?
4 cm/s
12 cm/s
25 cm/s
75 cm/s
During a hurricane, the air outside a home moves much faster than the air inside the home. Which of the following is possible to happen?
The windows can burst inward.
The windows can burst outward.
The windows cannot burst because the pressure inside and outside the home are equal.
The windows cannot burst because the force inside and outside the home are equal.
The pressure in a pipe carrying a liquid with a density of ρ and an initial velocity v at the inlet is P, which is y
meters lower than its outlet, which has a velocity of 2v. In these terms, what is the final pressure?
2Pρ(3v2+2gy)
P−21ρ(3v2+2gy)
P+21ρ(−3v2+ρgy)
Water flows through a pipe. At the larger end, the pipe has diameter D and the speed of the water is v1 . What is the speed of the water at the smaller end, where the pipe has diameter d ?
Four straws are open to water on the bottom and are exposed to flowing air going through an irregular tube on the top. Which cylinder will have the highest water level?
A
B
C
D
all the same
Point A of a tube is pressurized to 8 atm so that water flows uphill to tubes B, C, and D. At which point is the water speed the greatest?
B
C
D
all the same
Rank the sections in order from greatest pressure to least.
A, B, C, D
D, C, B, A
A, B = C = D
B = C = D, A
Consider a ball thrown up from the surface of the earth into the air at an angle of 30° above the horizontal. Air friction is negligible. Just after the ball is released, its acceleration is:
0 m/s2
Upwards at 9.8 m/s2
Downwards at 9.8 m/s2
Upwards at 4.9 m/s2
None of these
A fluid has a flow rate of 5.0 m3/s as it travels at a speed of 7.5 m/s through a pipe. What is the cross-sectional area of the pipe?
3.8 m2
1.5 m2
0.67 m2
0.27 m2
A fluid flows through a pipe whose cross-sectional area changes from 2.00 m2 to 0.50 m2. If the fluid’s speed in the wide part of the pipe is 3.5 m/s, what is its speed when it moves through the narrow part of the pipe?
0.071 m/s
0.88 m/s
1.1 m/s
14 m/s
The diagram below shows a section of a water pipe. The diameter of the pipe changes along the length of this section. At which two points in the pipe does water travel at approximately the same speed?
points W and Y
points W and Z
points X and Y
points X and Z
The venturi tubes shown above have three sections with different radii. Which of the following is true about the manometer readings?
P1 = P2 = P3
P3 > P1 > P2
P2 > P1 > P3
P1 > P2 > P3
An ideal fluid is moving from left to right through a pipe, as shown in the figure above. The diameter of the pipe decreases and the height increases from left to right. True statements about the pressure of the fluid as it moves through the pipe include which of the following? Select two answers.
The pressure tends to decrease due to the increase in the fluid’s speed as the pipe gets narrower.
The pressure tends to decrease due to the increase in the potential energy of the fluid-Earth system as the pipe gets higher.
The pressure tends to increase due to the decrease in the fluid’s speed as the pipe gets narrower.
The pressure tends to increase due to the increase in the potential energy of the fluid-Earth system as the pipe gets higher.
In a section of horizontal pipe with a diameter of 3.00 cm the pressure is 100 kPa and water is flowing with a speed of 1.50 m/s. The pipe narrows to 2.00 cm. What is the pressure in the narrower region?
95.4 kPa
47.7 kPa
44.4 kPa
225 kPa
The dashed line in the figure shows a stream of water from the end of a horizontal hose with an opening of diameter 2 cm. The water lands a horizontal distance D from the end of the hose. With the water pressure remaining the same, the diameter of the opening is decreased from 2cm to 1cm. At what horizontal distance from the end of the hose will the stream of water now land?
D/4
D/2
2D
4D
he pipe changes height from y1 = 2 meters to y2 = 3 meters. Since the areas are the same, we can say v1 = v2. Which of the following is true?
P1 = P2 + ρg(y2– y1)
P1 = P2
P1 = 0
P2 = 0
Four blocks are suspended in water as shown. Which blocks experiences the greatest buoyant force?
A
B
C
D
A stone tied up to the spring balance then dipped in the water. After reach a certain depth, the weight of stone decrease as shown. What is the buoyant force exert on the stone? What is the density of the stone? Assume the fluid is water ρ=1,000 m3kg
0.15 N , ρ=4,333.00 m3kg
1.5 N , ρ=433.33 m3kg
0.50 N, ρ=1,300 m3kg
0.65 N, ρ=1,000.0 m3kg
This is what happens to an object when the buoyant force is stronger than the gravitational force.
sinks
floats
neutrally buyant
I don't know...
Which properties affect buoyancy?
(select all that apply)
Mass
Volume
Density
Luster
Density is the relationship between which two quantities?
Mass and volume
Mass and weight
Volume and weight
A brick weighs the most in.......
air
water
space
According to the table: what would a block of gold do in gasoline?
Sink
Float
remain in place
A spherical buoy of diameter 0.5 m and mass 60 kg is attached to the seabed by a mooring rope and floats fully submerged. Calculate the tension in the mooring rope. Take density of seawater as 1020 kg/m3. (Use 2 d.p. throughout calculations)
38.2 N
46.4 N
54.5 N
61.8 N
An object of mass 20 𝑘𝑔 displaces 0.004 𝑚3of water when it is fully immersed in a water tank. consider density of water = 1000kg/m3. What is the buoyant force on the object immersed in water?
40 N
200 N
180 N
160 N
A 3.0 kg block hanging from a spring scale is submerged in a beaker of water until the spring scale reads 20 N. What is the buoyant force on the block?
10 N
17 N
37 N
50 N
The pressure exerted on the bottom of a dam by the water in the reservoir created by the dam depends on the
shape of the dam
area of the dam
depth of the water at the dam
surface area of the reservoir
shape of the bottom of the reservoir
A flask of water rests on a scale. If you dip your finger into the water, without touching the flask, the reading on the scale will
decrease.
stay the same.
increase.
behave unpredictably.
The Aswan High Dam is 111 m high. What is the the pressure due to the liquid (the gauge pressure) at the bottom of the dam?
1.09 × 106 Pa
9.9 x 10^5 Pa
1.16 × 106 Pa
5.4 x 10^5 Pa
A cylinder, semicircular in cross-section, 10.0 m long and 5.00 m in radius, is completely submerged in water. What is the buoyant force on the cylinder?
1.92 × 106 N
3.85 × 106 N
5.78 × 106 N
A cork has weight mg and density 25% of water’s density. A string is tied around the cork and attached to the bottom of a water-filled container. The cork is totally immersed. Express the tension in the string in terms of the cork weight mg.
0
mg
2mg
3mg
A block is connected to a light string attached to the bottom of a large container of water. The tension in the string is 3.0 N. The gravitational force from the earth on the block is 5.0 N. What is the block’s volume?
2.0×10−4 m3
3.0×10−4 m3
5.0×10−4 m3
8.0×10−4 m3
One cubic centimeter of iron (density ~7.8 g/cm3) and 1 cubic centimeter of aluminum (density ~2.7 g/cm3) are dropped into a pool, and they sink to the bottom. Which has the larger buoyant force on it?
iron
aluminum
both are the same.
neither has a buoyant force on it
A beachball is held down at the bottom of a small 'kiddie' pool. The beachball is then released. Once the ball is at the top of the water the surface will be
higher
lower
the same
there is not enough information to answer
The diagram shows a spurting cylinder with water spurting out at A, B and C.
Which one of the following statements is correct?
The spout with the least pressure pushes the water furthest.
The spout with the greatest pressure pushes the water furthest.
Water at C travels the furthest because there is more water at the bottom of the cylinder.
The pressure at spout A is greater than the pressure at spout B.
A
B
C
D
