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 9.1, Problem 1CC
The heat loss (Q/t, in units of joules per second [J/s]) from the surface of a hot liquid is given by:
Choose the correct set of fundamental dimensions for the parameter (h) from the choices below if the area (A) is given in units of square meters [m2]. Both the temperature of the liquid (T) and the ambient temperature (T0) are measured in degrees Celsius [°C].
- A. MT–3
- B. MT–3Θ–1
- C. ML2T–1Θ
- D. L2T–1
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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.
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.)
Chapter 9 Solutions
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
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