Mechanics of Fluids
Chapter 1: Basic Considerations
Sections 1.4 – 1.7
1. The specific weight of air at 5 km is nearest: (A) 6.14 N/m3
(B) 6.66 N/m3 (C) 7.26 N/m3 (D) 8.22 N/m3
2. The specific gravity of an unknown liquid is known to be 1.26. The liquid is most likely: (A) Glycerin
(B) Carb...
,Mechanics of Fluids Chapter 1: Basic Considerations
Sections 1.1 – 1.3
1. If force was selected as a fundamental dimension rather than mass, the units on density would
be:
(A) kg/m3
(B) N·s2/m4
(C) N/s2·m2
(D) s2/N·m2
2. Which of the following is not acceptable in the SI system of units?
(A) N·cm/s
(B) kg/L
(C) m/ns
(D) J/m2
3. The energy usage in the United States in 2010 was about 100 × 1018 J. This can be written as:
(A) 100 million GJ
(B) 1000 million GJ
(C) 100 billion MJ
(D) 100 trillion MJ
4. The fluids that are considered in this text:
(A) Have relatively low viscosities
(B) Must be subjected to a normal stress to have motion
(C) Have molecules that move relatively slowly
(D) Move when subjected to any shear stress
5. The mean free path where commercial aircraft fly (about 30,000 ft) is nearest:
(A) 0.0076 mm
(B) 0.0026 mm
(C) 0.00076 mm
(D) 0.00016 mm
,Mechanics of Fluids Chapter 1: Basic Considerations
Sections 1.4 – 1.7
1. The specific weight of air at 5 km is nearest:
(A) 6.14 N/m3
(B) 6.66 N/m3
(C) 7.26 N/m3
(D) 8.22 N/m3
2. The specific gravity of an unknown liquid is known to be 1.26. The liquid is most likely:
(A) Glycerin
(B) Carbon tetrachloride
(C) Mercury
(D) Water
3. Estimate the torque needed to rotate the inner cylinder at
1000 rpm if SAE-30 oil at 40°C fills the gap. Assume a linear T
velocity distribution in the gap. Neglect end effects.
(A) 16.0 N·m ω
(B) 16.9 N·m 1 mm
(C) 18.8 N·m
(D) 20.2 N·m 60-cm long concentric cylinders
4. Two clean, glass plates spaced 0.2 mm apart are placed in 20°C water. How far up the plates
will the water climb if the contact angle is 0°?
(A) 75 mm
(B) 70 mm
(C) 65 mm
(D) 60 mm
5. A farmer is applying compressed nitrogen to a field from a tank originally at 800 kPa. The
temperature of the nitrogen as it leaves the tank is approximately:
(A) −140°C
(B) −120°C
(C) −100°C
(D) −80°C
6. Thunder is heard 2.2 seconds after Lightning is observed in Arizona when the temperature is
50°C. The best estimate of how far away the lightning struck is nearest:
(A) 820 m
(B) 790 m
(C) 730 m
(D) 650 m
Sections 2.1 – 2.4.2
1. The force shown is partially due to a pressure acting uniformly
30o
over the area of 100 cm2. The pressure is nearest:
(A) 6.02 kPa 4000 N
(B) 6.91 N·m
(C) 8.84 N·m
(D) 10.1 N·m
2. The pressure on the lower surface of the cylinder is 20 kPa. If
the variation of pressure in the vertical direction is given by pupper
∂p /∂z = −2400 Pa/m, the pressure on the upper surface is
nearest:
20 cm
(A) 19.52 kPa 60 cm
(B) 20.48 kPa
(C) −28.0 kPa plower
(D) 31.20 kPa
3. A water-well driller measures the water level in a well to be 20 ft below the surface. The point
on the well is 250 ft below the surface. The pressure at the point, in SI units, is estimated to be:
(A) 632 kPa
(B) 652 kPa
(C) 688 kPa
(D) 698 kPa
4. To calculate the pressure in the standard atmosphere at 6000 m, the lapse rate is used (see Eq.
2.4.8). The percentage error, considering the pressure from Table B.3 in the Appendix to be
more accurate, is nearest:
(A) 0.08 %
(B) 0.13 %
(C) 0.24 %
(D) 0.31 %
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