Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
3rd Edition
ISBN: 9780133593211
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Chapter 15, Problem 6RQ
The Apple TV™ is a personal video device created by Apple, Inc. that attaches to high- definition televisions to present streaming content to a viewer on demand, in contrast to a standard source (cable/satellite) set-top box or digital video recorder (DVR) that presents recorded or live broadcast signals on a television. According to a study conducted by the Natural Resources Defense Council in June 2011 , if consumers were to move from set-top boxes to smaller "thin" devices like the Apple TV, there would be an overall 70% reduction in annual energy costs resulting from the use of set-top boxes.
The following data table shows the typical power consumption of the Apple TV in different power states (standby/off, idle-not playing any video content, playing via Ethernet, and playing via Wifi). Create an algorithm that allows a user to provide the power currently being used by their Apple TV in units of watts and determine the state of the device. If the user provides value for the power outside the range in the following table, your algorithm should report that the state of the device is unknown.
Power Consumption of the Apple TV
| State | Power Consumption [W] |
| Off/Standby | less than 0.5 |
| Idle | 0.5 to 1.5 |
| Streaming via Ethernet | 1.5 to 1.6 |
| Streaming via Wdi | 1.6to 2 |
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6. Consider a 10N step input to the mechanical system shown below, take M = 15kg, K = 135N/m, and
b = 0.4 Ns/m.
(a) Assume zero initial condition, calculate the
(i)
System pole
(ii)
System characterization, and
(iii) The time domain response
(b) Calculate the steady-state value of the system
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2. Solve the following linear time invariant differential equations using Laplace transforms subject to
different initial conditions
(a) y-y=t
for y(0) = 1 and y(0) = 1
(b) ÿ+4y+ 4y = u(t)
for y(0) = 0 and y(0) = 1
(c) y-y-2y=0
for y(0) = 1 and y(0) = 0
3. For the mechanical systems shown below, the springs are undeflected when x₁ = x2 = x3 = 0 and
the input is given as fa(t). Draw the free-body diagrams and write the modeling equations governing
each of the systems.
K₁
000
K₂
000
M₁
M2
-fa(t)
B₂
B₁
(a)
fa(t)
M2
K₂
000
B
K₁
x1
000
M₁
(b)
Chapter 15 Solutions
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Ch. 15.1 - For the problem statement, list all knowns,...Ch. 15.1 - For the problem statement, list all knowns,...Ch. 15.2 - Create a written algorithm to multiply all integer...Ch. 15.3 - Create a graphical algorithm to multiply all...Ch. 15 - Your instructor will provide you with a picture of...Ch. 15 - Describe the steps necessary to create a paper...Ch. 15 - Describe the steps necessary to create a jelly...Ch. 15 - An unmanned X-43A scramjet test vehicle has...Ch. 15 - Convert a temperature provided by the user in...Ch. 15 - Determine the mass of oxygen gas (formula: O2...
Ch. 15 - Determine the length of one side of a cube of...Ch. 15 - The Occupational Safety Health Administration...Ch. 15 - Prob. 9ICACh. 15 - Prob. 10ICACh. 15 - Describe the steps necessary to cook your favorite...Ch. 15 - Describe the steps necessary to walk from your...Ch. 15 - Prob. 13ICACh. 15 - Prob. 14ICACh. 15 - Create a flowchart that represents the following...Ch. 15 - Prob. 16ICACh. 15 - Create an algorithm to determine the weight of a...Ch. 15 - The Eco-Marathon is an annual competition...Ch. 15 - Prob. 3RQCh. 15 - Prob. 4RQCh. 15 - 5. Create an algorithm to determine how long it...Ch. 15 - The Apple TV is a personal video device created by...Ch. 15 - Prob. 7RQCh. 15 - Prob. 8RQCh. 15 - Prob. 9RQCh. 15 - Prob. 10RQCh. 15 - Prob. 11RQCh. 15 - Create a written algorithm or flowchart as...Ch. 15 - Prob. 13RQCh. 15 - Prob. 14RQCh. 15 - Prob. 15RQ
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