A single change in direction of less than 90° is known as a(n) _____.
a. elbow
b. offset
c. saddle
d. kick
d. kick
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Most of the time, efflorescence cannot be removed with only water and a scrub brush.
Answer the following statement true (T) or false (F)
The boiling temperature of nitrogen at atmospheric pressure at sea level (1?atm) is ??196°C. Therefore, nitrogen is commonly used in low-temperature scientific studies since the temperature of liquid nitrogen in a tank open to the atmosphere remains constant at ??196°C until the liquid nitrogen in the tank is depleted. Any heat transfer to the tank results in the evaporation of some liquid nitrogen, which has a heat of vaporization of 198?kJ/kg and a density of 810 kg/m3 at 1 atm. Consider a 4-m-diameter spherical tank initially filled with liquid nitrogen at 1 atm and ??196°C. The tank is exposed to 20°C ambient air with a heat transfer coefficient of 25?W/m2•K. The temperature of the thin-shelled spherical tank is observed to be almost the same as the
temperature of the nitrogen inside. Disregarding any radiation heat exchange, determine the rate of evaporation of the liquid nitrogen in the tank as a result of the heat transfer from the ambient air.
What will be an ideal response?
Which of the following is indicated on a panelboard schedule?
a. GEC b. Size of wires c. Service head d. Panel mains
Let a signal be defined by x (t) = 2 cos (4?t) + 5 cos (15?t) .
Find the CTFTs of x (t ? 1/40) and x (t + 1/20) and identify the resultant phase shift of each sinusoid in each case. Plot the phase of the CTFT and draw a straight line through the 4 phase points that result in each case. What is the general relationship between the slope of that line and the time delay?
