Physics, 12.12.2019 04:31 claudiagallegos26
Consider a sealed 20-cm-high electronic box whose base dimensions are 50 cm × 50 cm placed in a vacuum chamber. the emissivity of the outer surface of the box is 0.95. if the electronic components in the box dissipate a total of 120 w of power and the outer surface temperature of the box is not to exceed 55°c, determine the temperature at which the surrounding surfaces must be kept if this box is to be cooled by radiation alone. assume the heat transfer from the bottom surface of the box to the stand to be negligible.
Answers: 3
Physics, 22.06.2019 06:30
At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid
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Physics, 22.06.2019 10:30
Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?
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1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?
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Physics, 22.06.2019 12:00
In an experiment, how can i change human errors? be specific.
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Consider a sealed 20-cm-high electronic box whose base dimensions are 50 cm × 50 cm placed in a vacu...
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