FLUID MECHANICS
Quiz by Mark Paulo San Juan
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- Q1
The pressure inside a commercial airliner is maintained at 1.00 atm (105 Pa). What is the net outward force exerted on a 1.0 m x 2.0 m cabin door if the outside pressure is 0.30 atm?
140 N
14 000 N
1 400 N
140 000 N
300s - Q2
A stonecutter's chisel has an edge area of 0.50 cm2. If the chisel is struck with a force of 45 N, what is the pressure exerted on the stone?
900 000 Pa
9 000 Pa
90 000 Pa
450 000 Pa
300s - Q3
The Greenland ice sheet can be one km thick. Estimate the pressure underneath the ice. (The density of ice is 918 kg/m3.)
9 atm
45 atm
25 atm
90 atm
300s - Q4
A solid object is made of two materials, one material having density of 2 000 kg/m3 and the other having density of 6 000 kg/m3. If the object contains equal volumes of the materials, what is its average density?
4 000 kg/m3
5 300 kg/m3
3 000 kg/m3
not enough information
300s - Q5
A solid object is made of two materials, one material having density of 2 000 kg/m3 and the other having density of 6 000 kg/m3. If the object contains equal masses of the materials, what is its average density?
3 000 kg/m3
Not enough information
4 000 kg/m3
5 300 kg/m3
300s - Q6
A 15 000-N car on a hydraulic lift rests on a cylinder with a piston of radius 0.20 m. If a connecting cylinder with a piston of 0.040-m radius is driven by compressed air, what force must be applied to this smaller piston in order to lift the car?
1 500 N
600 N
3 000 N
15 000 N
300s - Q7
By what factor is the total pressure greater at a depth of 850 m in water than at the surface where pressure is one atmosphere? (water density = 1.0 x 103 kg/m3, 1 atmosphere pressure = 1.01 x 105 N/m2, and g = 9.8 m/s2)
100
19
74
83
300s - Q8
If the column of mercury in a barometer stands at 72.6 cm, what is the atmospheric pressure? (The density of mercury is 13.6 x 103 kg/m3 and g = 9.80 m/s2)
1.07 x 105 N/m2
1.03 x 105 N/m2
0.925 x 105 N/m2
0.968 x 105 N/m2
300s - Q9
Atmospheric pressure is 1.0 x 105 N/m2, and the density of air is 1.29 kg/m3. If the density of air is constant as you get higher and higher, calculate the height of the atmosphere needed to produce this pressure.
10 300 m
1 260 m
77 000 m
7 900 m
300s - Q10
How deep under the surface of a lake would the pressure be double that at the surface? (1 atm = 1.01 x 105 Pa)
32.2 m
9.80 m
1.00 m
10.3 m
300s - Q11
Which of the following materials has the highest density?
Water
Aluminum
Copper
Gold
60s - Q12
If the mass of an object increases while its volume remains constant, its density will:
decrease
depend on gravity
nothing changes
increase
60s - Q13
The density of an object can be calculated using the formula:
Density = Mass × Volume
Density = Weight × Volume
Density = Volume ÷ Mass
Density = Mass ÷ Volume
60s - Q14
An object floats on water if its density is:
Equal to the density of water
Greater than the density of water
Independent of the density of water
Less than the density of water
60s - Q15
Fluid pressure at a given depth depends on:
The mass of the object submerged
Only the density of the fluid
The shape of the container
The depth and density of the fluid
60s