Asolid plate, with a thickness of 15 cm and a thermal conductivity of 80 w/m·k, is being cooled at the upper surface by air. the air temperature is 10°c, while the temperatures at the upper and lower surfaces of the plate are 650 50 and 60°c, respectively. determine the convection heat transfer coefficient of air at the upper surface and discuss whether the value is reasonable or not for force convection of air.
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Physics, 22.06.2019 11:10
While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.
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Physics, 22.06.2019 16:30
Select all the correct answers. which three statements about electromagnetic radiation are true?
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Physics, 22.06.2019 18:30
Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions
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Physics, 22.06.2019 19:30
Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?
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Asolid plate, with a thickness of 15 cm and a thermal conductivity of 80 w/m·k, is being cooled at t...
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