Rext = 4.7 k? and C = 0.47 ?F. The pulse width of the one-shot is
A) 13.9 ms B) 720 ms C) 139 ?s D) 2.43 ms
D
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Currently, buildings account for approximately 50% of all ____ gas emissions.
a. farmhouse b. greenhouse c. whitehouse d. natural
The simple gear set in a LePelletier gear train operates in a ________ ratio.
A) Reverse B) Reaction C) Overdrive D) Reduction
Crossbred cows are healthier because of _____, which cuts the cost of veterinary bills.
Fill in the blank(s) with the appropriate word(s).
A person’s head can be approximated as a 25-cm diameter sphere at 35?C with an emissivity of 0.95. Heat is lost from the head to the surrounding air at 25°C by convection with a heat transfer coefficient of 11 W/m2•°C, and by radiation to the surrounding surfaces at 10°C. Disregarding the neck, determine the total rate of heat loss from the head.
(a) 22 W (b) 27 W (c) 49 W (d) 172 W (e) 249 W