Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781305176423
Author: ERJAVEC
Publisher: Cengage
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Chapter 48, Problem 14RQ
Which of the following statements about two-stage air bags is not true?
- When low-pressure air bag deployment is desired, only one squib is fired.
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A short brass cyclinder (denisty=8530 kg/m^3, cp=0.389 kJ/kgK, k=110 W/mK, and alpha=3.39*10^-5 m^2/s) of diameter 4 cm and height 20 cm is initially at uniform temperature of 150 degrees C. The cylinder is now placed in atmospheric air at 20 degrees C, where heat transfer takes place by convection with a heat transfer coefficent of 40 W/m^2K. Calculate (a) the center temp of the cylinder, (b) the center temp of the top surface of the cylinder, and (c) the total heat transfer from the cylinder 15 min after the start of the cooling. Solve this problem using the analytical one term approximation method. (Answer: (a) 45.7C, (b)45.3C, (c)87.2 kJ)
A short brass cyclinder (denisty=8530 kg/m^3, cp=0.389 kJ/kgK, k=110 W/mK, and alpha=3.39*10^-5 m^2/s) of diameter 4 cm and height 20 cm is initially at uniform temperature of 150 degrees C. The cylinder is now placed in atmospheric air at 20 degrees C, where heat transfer takes place by convection with a heat transfer coefficent of 40 W/m^2K. Calculate (a) the center temp of the cylinder, (b) the center temp of the top surface of the cylinder, and (c) the total heat transfer from the cylinder 15 min after the start of the cooling. Solve this problem using the analytical one term approximation method.
A 6 cm high rectangular ice block (k=2.22 W/mK, and alpha=0.124*10^-7 m^2/s) initially at -18 degrees C is placed on a table on its square base 4 cm by 4cm in size in a room at 18 degrees C. The heat transfer coefficent on the exposed surfaces of the ice block is 12 W/m^2K. Disregarding any heat transfer from the base to the table, determine how long it will be before the ice block starts melting. Where on the ice block will the first liquid droplets appear? Solve this problem using the analytical one-term approximation method.
Chapter 48 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 48 - What is the difference between a passive and an...Ch. 48 - Prob. 2RQCh. 48 - Describe the three types of safing sensors.Ch. 48 - Prob. 4RQCh. 48 - True or False? The air bag diagnostic monitor...Ch. 48 - True or False? The powdery substance released from...Ch. 48 - True or False? When servicing the steering wheel...Ch. 48 - Which of the following statements about the SRS...Ch. 48 - Describe the two basic types of passenger weight...Ch. 48 - What type of scat belt operates automatically with...
Ch. 48 - Which of the following is false? The air bag...Ch. 48 - List at least five service precautions that must...Ch. 48 - Prob. 13RQCh. 48 - Which of the following statements about two-stage...Ch. 48 - Which of the following statements about seat belt...Ch. 48 - Prob. 1ASRQCh. 48 - Technician A says that seat belt webbing should be...Ch. 48 - Technician A says that the module assembly will...Ch. 48 - While testing seat belt retractors: Technician A...Ch. 48 - Technician A checks the clockspring electrical...Ch. 48 - Technician A removes the positive battery cable...Ch. 48 - Technician A says that ignition of the air bag...Ch. 48 - Technician A says that the steering column...Ch. 48 - While diagnosing a seat belt that will not buckle:...Ch. 48 - While diagnosing the cause of a constant SRS...
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