Physics, 03.03.2020 02:58 chazpooh39151
An experimental device that produces excess heat is passively cooled. The addition of pin fins (cylindrical fins) to the casing of this device is being considered to augment the rate of cooling. Consider a copper pin fin 0.25cm in diameter that protrudes from a wall at 95degC into ambient air at 25degC. The natural convection coefficient of the air is 10 W/m2-K. Calculate the heat loss assuming first that the fin is infinitely long, then assuming the fin is 2.5cm long and the coefficient at the end is the same as around the circumference. How long would the fin have to be for the infinitely long solution to be correct within 5%
Answers: 2
Physics, 21.06.2019 22:30
The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage
Answers: 2
Physics, 22.06.2019 10:00
(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present
Answers: 3
Physics, 22.06.2019 17:30
Which basic property determines a colored light's placement on the spectrum of visible light? a. speed b. frequency c. amplitude d. velocity
Answers: 3
An experimental device that produces excess heat is passively cooled. The addition of pin fins (cyli...
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