Instructor Problems+Solutions Manual – Instructor Problems+Solutions Manual – Student Problems

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Instructor’s Supplement Problems
CHAPTER 1 PROBLEMS

 

Engineering Fluid Mechanics (§1.1)
Prof 1.1 For the given problem, present a solution that demonstrates
the standard structure of critical thinking.
PROBLEM STATEMENT. Calculate x for this triangle.
Prof Problem 1.1
90°
4
x
30°
Modeling in Fluid Mechanics (§1.2)
Prof 1.2 Based on molecular mechanisms, explain why aluminum
melts at 660°C, whereas ice melts at 0°C.
Weight, Mass, and NLUG (§1.4)
Prof 1.3 (T/F) The constant g = 9.81 m/s2 can also be written as
g = 9.81 N/kg.
Prof 1.4 On planet Y, an 8 lbm object weighs 5 lbf on a spring
balance. In units of m/s2, what is the value of g on planet Y?
(a) 14.7 (b) 13.0 (c) 15.7 (d) 9.8 (e) 6.1
Essential Math Topics (§1.5)
Prof 1.5 If F = pA, p = 74,000 Pa, and A = 1e-06 m2, then the
force F is
(a) 74 mN (b) 0.0074 N (c) 740 μN (d) 74 μN
(e) 74 × 10−5 N
Density and Specific Weight (§1.6)
Prof 1.6 What is the weight in kN of a spa that is filled with
1500 L of water? The mass of the spa when it is empty is 250 kg.
(a) 13 (b) 15 (c) 17 (d) 21 (e) 23
Prof 1.7 A fluid tank in the shape of a cube holds a mass m of
a liquid. Each side of the tank has a length L. What length is
required to hold 11 times as much mass of the same liquid, also
in a cube-shaped tank?
(a) 1.14L (b) 2.22L (c) 3.67L (d) 4.91L (e) 2.83L
Prof 1.8 A tank holds x = 12 kN of a liquid. What formula gives
the volume of the tank?
a. γ/x
b. x/γ
c. γx
d. 1/(γx)
e. xγ/ρ
Ideal Gas Law (IGL) (§1.7)
Prof 1.9 (T/F) If nitrogen in a steel tank is heated, then the density
of the nitrogen will decrease.
Prof 1.10 Determine the density of methane gas at a pressure of
200 kN/m2 absolute and a temperature of 80°C.
Prof 1.11 At a temperature of 100°C and an absolute pressure of
4 atmospheres, what is the ratio of the density of water to the
density of air, ρw/ρa?
Quantity, Units, and Dimensions (§1.8)
Prof 1.12 Apply the grid method to calculate the density of an
ideal gas using the formula ρ = p/RT. Express your answer in
lbm/ft3. Use the following data: the absolute pressure is p = 60
psi, the gas constant is R = 1716 ft∙lbf/slug∙°R, and the temperature
is T = 180°F.
Prof 1.13 The dimensions of mass are
(a) FL/T2 (b) FT2/L (c) FL/T (d) FT/L (e) FT/L2
Prof 1.14 The power provided by a centrifugal pump is given by
P =m · gh, where m · is mass flow rate, g is the gravitational
constant, and h is pump head. Prove that this equation is
dimensionally homogeneous.
Instructor’s Supplement Problems
CHAPTER 1 PROBLEMS
1