Air at 14.7 psia and 85ºF enters a square 1 ft x 1 ft heating duct. If the duct is 80 ft long and has an inside surface temperature of 65ºF, determine (a) hydraulic diameter, (b) convective heat transfer coefficient, and (c) air temperature leaving the duct.
What will be an ideal response?
The hydraulic diameter is
Physics & Space Science
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Indicate whether the statement is true or false
Physics & Space Science
Galaxy A receding from Galaxy B at a velocity of 75000 km/s, from the perspective of Galaxy B. Hubble's Law says that V=H0 x D. About how far is Galaxy A from Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A. 50000 Mpc B. 100 Mpc C. 500,000 Mpc D. 5000 Mpc E. 1000 Mpc
Physics & Space Science
Determine the equivalent capacitance of the combination shown when C = 45 ?F.
A. 28 ?F B. 36 ?F C. 52 ?F D. 44 ?F E. 23 ?F
Physics & Space Science
Which is the middle number in this list?
a. 10 b. 100 c. 10^-1 d. 10^10 e. 10^2
Physics & Space Science