Author Question: If the R-value of a wall is 10 ft2-F-hr/Btu, then the rate of heat transfer through a 2 ft 3 ft ... (Read 36 times)

jilianpiloj · **on:** Jul 28, 2018

If the R-value of a wall is 10 ft2-F-hr/Btu, then the rate of heat transfer through a 2 ft 3 ft section of wall, with T = 50F, will be:
a. 10 b. 30 c. 500 d. 3000 e. 10,000 Btu/hr

Question 2

A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the earth, what is the speed of the rain with respect to the earth?
a. 48 km/h
b. 95 km/h
c. 58 km/h
d. 32 km/h
e. 80 km/h