______________ is defined as the angular measurement, in degrees, east or west of the Greenwich, or prime, meridian
a. The equator
b. The International Date Line
c. Latitude
d. Longitude
d
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The position of an air-track cart that is oscillating on a spring is given by x = (12.4 cm) cos[(6.35 s-1)t]. At what value of t after t = 0 s is the cart first located at x = 8.47 cm?
A) 4.34 s B) 0.108 s C) 0.129 s D) 7.39 s E) 7.75 s
A 30-cm-OD pipe with a surface temperature of 90°C carries steam over a distance of 100 m. The pipe is buried with its center line at a depth of 1 m, the ground surface is –6°C, and the mean thermal conductivity of the soil is 0.7 W/(m K). Calculate the heat loss per day, and the cost of this loss if steam heat is worth $3.00 per 106 kJ. Also, estimate the thickness of 85% magnesia insulation necessary to achieve the same insulation as provided by the soil with a total heat transfer coefficient of 23 W/(m2 K) on the outside of the pipe.
GIVEN
FIND
(a) The heat loss per 24 hour day
(b) The value of the lost heat
(c) The thickness of 85% magnesia insulation necessary to achieve the same insulation
ASSUMPTIONS
Steady state conditions
Uniform thermal conductivity
Two dimensional heat transfer from the pipe
SKETCH
A transformer is to be designed to increase the 30 kV-rms output of a generator to the transmission-line voltage of 345 kV-rms. If the primary winding has 80 turns, how many turns must the secondary have?
a. 6 b. 70 c. 920 d. 9200 e. 12
What type of software are SnagIt and FullShot?
A. photo sharing B. image-editing C. screen capture D. digital photography