Find the thermal resistance r (in hr · °F/BTU) and the equivalent R-value (in hr · ft. °F/BTU) of a typical frame 18' x 8.0' wall consisting of a 0.5" plaster board on the inside of the room, nominal 2 x 4 studs, and a 0.5" sheathing on the outside. The spaces between the studs are filled with an R-13 insulating foam. What is the heat loss (in BTU) through this wall in four hours if the inside temperature is 72°F and the outside temperature is 32°F? (Assume that the 15% of the wall's area are studs and the remaining 85% is filled with the insulating foam. Assume that the air is moving outside the wall.) r= (0.147 hr. °F/BTU

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Moment of Inertia

Inertia can be termed as a resistance offered by a body to change its state. A rigid body initially at rest will apply resistance when acted by an external force that tends to change its state of rest or velocity, or a body initially at motion will provide resistance in changing its state of velocity or motion for coming to a state of rest. In other words, Newton's first law of motion describes the law of inertia of a rigid body.