Why should a technician not file the rough surfaces of a contactor's contacts?
What will be an ideal response?
The base metal will be exposed and the contacts will deteriorate.
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The approximate R-value of an air space in a wall with an aluminum foil lining is
A) R-2.0. B) R-2.5. C) R-1. D) R-1.5. E) none of the above.
The temperature of heated seats is regulated by ________
A) Thick seat insulation B) A seat cushion temperature sensor and seat module C) A heat sensor on top of the under-seat carpet D) None of these
If a typical adult inhales 3.5 L of air per breath and breathes 15 times per minute, how many grams of oxygen will be inhaled during 24 hours if the density of air is 1.225 kg/m3?
What will be an ideal response?
One mole of air, initially at 150°C and 8 bar, undergoes the following mechanically reversible changes. It expands isothermally to a pressure such that when it is cooled at constant volume to 50°C its final pressure is 3 bar. Assuming air is an ideal gas for which 
and 
calculate W, Q, ?U, and ?H.
What will be an ideal response?