Thinking Like an Engineer: An Active Learning Approach (4th Edition)
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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Chapter 12, Problem 14RQ
  1. 14. The data shown in the following graph was collected during testing of an electromagnetic mass driver. The energy to energize the electromagnets was obtained from a bank of capacitors. The capacitor bank was charged to various voltages, and for each voltage, the exit velocity of the projectile was measured when the mass driver was activated.

Chapter 12, Problem 14RQ, 14. The data shown in the following graph was collected during testing of an electromagnetic mass

  • Note

    Due to several complicated nonlinear losses in the system that are far beyond the

    scope of this course, this is a case of a power model in which the exponent does not come out to be an integer or simple fraction, so rounding to two significant figures is appropriate. In fact, this model is only a first approximation-a really accurate model would be considerably more complicated.

    1. a. What would the velocity be if the capacitors were charged to 100,000 volts?
    2. b. What voltage would be necessary to accelerate the projectile to 1000 meters per second?
    3. c. Assume that the total capacitance is 5 farads. If the capacitors are initially charged to 10,000 volts and are discharged to 2000 volts during the launch of a projectile, what is the mass of the projectile if the overall conversion of energy stored in the capacitors to kinetic energy in the projectile has an efficiency of 20%? Recall that the energy stored in a capacitor is given by E = 0.5 CV2, where C is capacitance in farads and V is voltage in volts.
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Chapter 12 Solutions

Thinking Like an Engineer: An Active Learning Approach (4th Edition)

Ch. 12 - The graph shows the ideal gas law relationship (PV...Ch. 12 - An inductor is an electrical device that can store...Ch. 12 - Solid objects, such as your desk or a rod of...Ch. 12 - Mercury has a dynamic viscosity of 1.55...Ch. 12 - SAE 99W10, a brand new type of motor oil has a...Ch. 12 - You have two springs each of stiffness 2 newton...Ch. 12 - Prob. 7ICACh. 12 - Four springs were tested, with the results shown...Ch. 12 - Four circuits were tested, with the results shown...Ch. 12 - Assume you have an unlimited number of inductors...Ch. 12 - a. The equivalent capacitance of the circuit shown...Ch. 12 - A standard guitar, whether acoustic or electric,...Ch. 12 - The vibrating frequency of a guitar string depends...Ch. 12 - Solid objects, such as your desk or a rod of...Ch. 12 - Eutrophication is a process whereby lakes,...Ch. 12 - The following graph shows the relationship between...Ch. 12 - The total quantity (mass) of a radioactive...Ch. 12 - Match the data series from the options shown on...Ch. 12 - 1. For a simple capacitor with two f lat plates,...Ch. 12 - 2. When we wish to generate hydroelectric power,...Ch. 12 - 3. When rain falls over an area for a sufficiently...Ch. 12 - You are experimenting with several liquid metal...Ch. 12 - 5. The resistance of a wire (R [ohm)) is a...Ch. 12 - 6. Use the figure shown to answer the following...Ch. 12 - 7. You are given four springs, one each of...Ch. 12 - You have three springs. You conduct several tests...Ch. 12 - 9. You are given four resistors, each of 7.5, 10,...Ch. 12 - 10. You have three resistors. You conduct several...Ch. 12 - 11. Use the diagrams shown to answer the following...Ch. 12 - 12. When a buoyant cylinder of height H, such as a...Ch. 12 - 13. It is difficult to bring the Internet to some...Ch. 12 - 14. The data shown in the following graph was...Ch. 12 - 15 A standard guitar, whether acoustic or...Ch. 12 - 16. Your supervisor has assigned you the task of...Ch. 12 - 17. One of the NAE Grand Challenges for...Ch. 12 - 18. When volunteers build a Habitat for Humanity...Ch. 12 - 1. As part of an electronic music synthesizer, you...Ch. 12 - Prob. 20RQ
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