Fill in the blank(s) with the appropriate word(s).
11.83
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As president, President Jefferson showed unexpected moderation and a conciliatory attitude toward his Federalist political opponent by
A. dismissing very few public servants for political reasons. B. refusing to repeal the federal excise tax enacted by the Federalists. C. renewing the Sedition Act for another ten years. D. pursuing a pro-British and anti-French foreign policy. E. rejecting the expansion of slavery anywhere in the Louisiana Territory.
Clamps that fasten directly to a wall to hold the pipe firmly and closely against the wall are _____ clamps.
a. wall support b. wall saddle c. riser d. double-bolt
A heating cable is embedded in a concrete slab to melt snow on a 5-m × 5-m surface area. The heating cable is heated electrically with joule heating. The concrete has a thermal conductivity of 1.4 W/m•K, and the layer between the slab surface and the heater surface is 50 mm. When the surface is covered with snow, the heat generated from the heating cable can melt snow at a rate of 0.1 kg/s. According to the National Electrical Code (NFPA 70), the power density (heat flux) for embedded snow-melting equipment should not exceed 1300 W/m2. Under the given conditions, does the concrete slab with the embedded heating cable operate in compliance with the NFPA 70 code? Also, to minimize thermal stress in the concrete, the temperature difference between the heater surface (T1) and the slab
surface (T2) should not exceed 21°C (2015 ASHRAE Handbook—HVAC Applications, Chap. 51). Do the current operating conditions allow T1 ? T2 ? 21°C?
What will be an ideal response?
What is the pressure in psi required to lift water 20 feet?
A) (20 ft × 0.433 lbs/ft) 144 in2/ft2 = 0.06 psi B) 14.7 psi - just enough to overcome atmospheric pressure C) 20 ft × 0.433 lbs/ft = 8.66 psi D) It is not possible to determine the pressure without knowing the cross sectional area of the pipe.