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E175 Memory Items

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Verified questions

ENGINEERING

A 10-m-long section of a 6-cm-diameter horizontal hot-water pipe passes through a large room whose temperature is $27^\circ C.$ If the temperature and the emissivity of the outer surface of the pipe are $73^\circ C$ and 0.8, respectively, determine the rate of heat loss from the pipe by (a) natural convection and (b) radiation.

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ENGINEERING

At a casino, people line up to pay $20 each to be a contestant in the following game: The contestant flips a fair coin repeatedly. If she flips heads 20 times in a row, she walks away with R=20 million dollars; otherwise she walks away with R=0 dollars. (a) Find the PMF of R, the reward earned by the contestant. (b) The casino counts "losing contestants" who fail to win the 20 million dollar prize. Let L equal the number of losing contestants before the first winning contestant. What is the PMF of L? (c) Why does the casino offer this game?

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ENGINEERING

When an airplane is flying at a constant speed relative to the ground, is it correct to say that the Mach number of this airplane is also constant?

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ENGINEERING

a) pressure P is incorrect on the diagram. Latex is not written so well. Grammar should be fixed b) In the 10th row, the explanation sentence is incorrect: we use equation for specific measurable quantities

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