An exterior wall of a house may be approximated by a 4-in layer of common brick (k 0 followed by a 1.5 in layer of gypsum plaster (k 0.48 w/m c). what thickness of loosely packed rock- wool insulation (k 0.065 w/m c) should be added to reduce the heat loss through the wall by 80 percent?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.