Physics, 30.04.2021 20:10 ibidnnudny2584
If a light ray strikes a surface with an angle of
incidence of 17°, what is the angle between the ray
and the surface?
a 163°
b 73°
C 107°
d 90°
Answers: 3
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Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same
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What defines the mass number of an isotope? a. the sum of the neutrons and protons b. the sum of the neutrons and electrons c. the number of neutrons d. the number of protons
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If an object with an initial temperature of 300 k increases its temperature by 1°c every minute, by how many degrees fahrenheit will its temperature have increased in 10 minutes? (a) 6°f (b) 10°f (c) 18°f (d) 30°f
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Physics, 22.06.2019 10:30
Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.
Answers: 2
If a light ray strikes a surface with an angle of
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