Animals under the care and protection of humans have no need for horns
Indicate whether the statement is true or false.
True.
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What law is represented when current flow through a device increases in direct proportion to voltage?
A. Hartley's law B. Plank's law C. Ohm's law D. Henry's law
After refrigerant lines have been installed, they should be evacuated to a pressure of ____.
A. 28" vacuum B. 28" vacuum C. 5,000 microns D. 500 microns
_____ footings are constructed by digging out the soil and placing the concrete in the trench.
A. Stepped B. Dugout C. Formed D. Trench
An electric space heater has a metal coil at a temperature of 250°C, and is used to heat a space with an air temperature of 15°C. If the surface area of the space heater is 0.02 m2, and the emissivity of the heating element is 0.95, what is the rate of radiation heat transfer between the heater and the air?
Given: Ts = 250°C = 523 K; Tsurr = 15°C = 288 K; A = 0.02 m2; ? = 0.95 What will be an ideal response?