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A) A room with a pine ceiling measured 13 m x 6 m x 4 cm thick. On a cold day the temperature on inside of the ceiling is T1 = 22 oC and in the attic T2 = 2 oC. If a 4 cm piece of insulation is added to the pine ceiling kpine = 0.120 J/msC kinsul = 0.042 J/msC If a 4 cm piece of insulation is added to the pine ceiling , find the interface temperature for the pine and insulation. Ti =
B) A room with a pine ceiling measured 13 m x 6 m x 4 cm thick. On a cold day the temperature on inside of the ceiling is T1 = 22 oC and in the attic T2 = 2 oC. If a 4 cm piece of insulation is added to the pine ceiling kpine = 0.120 J/msC kinsul = 0.042 J/msC If 4 cm of insulation is added to the pine ceiling how much heat does the layer of pine / insulation transmit in one hour. Heat lost in one hour = _____Joules ?
C) A room with a pine ceiling measured 13 m x 6 m x 4 cm thick. On a cold day the temperature on inside of the ceiling is T1 = 22 oC and in the attic T2 = 2 oC. If a 4 cm piece of insulation is added to the pine ceiling kpine = 0.120 J/msC kinsul = 0.042 J/msC If 4 cm piece of insulation is added to the pine ceiling, find the % decrease in heat loss , once the insulation has been installed. Efficiency= ___%?
A loudspeaker of mass 19.0 is suspended a distance of = 2.00 below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of = 3.30. Illustrate what is the tension in each of the cables?
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