Thinking Like an Engineer: An Active Learning Approach (4th Edition)
4th Edition
ISBN: 9780134639673
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Textbook Question
Chapter 9.4, Problem 4CC
The Euler number is a function of the pressure drop, velocity, and density. Determine the form of the Euler number with Rayleigh’s method.
| Pressure drop | ΔP | pascal[Pa] |
| Density | ρ | grams per cubic centimeter [g/cm3] |
| Velocity | ν | meters per second[m/s] |
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Please do this carefully.
A graphing calculator is recommended.
If a rock is thrown upward on the planet Mars with a velocity 8 m/s, its height in meters t seconds later is given by y
(a) Find the average velocity (in m/s) over the given time intervals.
(i) [1, 2]
(ii) [1, 1.5]
(iii) [1, 1.1]
(iv) [1, 1.01]
(v) [1, 1.001]
m/s
m/s
m/s
m/s
m/s
(b) Use your answers from part (a) to estimate the instantaneous velocity of the rock (in m/s) when t = 1.
m/s
= 8t - 1.86t². (Round your answers to two decimal places.)
3. Consider the following equation. All three of the terms in parentheses are dimensionless groups.
Because kc is difficult to determine directly, the other variables are measured and kc is calculated
from the given equation.
26
THERMODYNAMICS 1
MODULE 1
FUNDAMENTAL CONCEPTS
]3 [ _d>vp_jo8
p DAB
kc D
= 0.023 [H
DAB
What is the estimated value of kc? What are the units of kc? Show your work.
The following values were measured:
D = 8.0 mm, DAB = 0.475 cm²/s, µ = 1.12 x 103 N-s/m², p = 1.00 x 10-³ g/cm³, v = 15.0 m/s.
Chapter 9 Solutions
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
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