A porch roof that slopes upward at 45° measures 3.0 m × 5.0 m. It is covered with a slab of insulating material that is 2.0 cm thick. If the density of the insulation is 15 kg/m3, what is the weight of the insulation, in pounds, on the roof? (1.00 kg weighs 2.2 lb and density is mass per unit volume.)
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Answer:
Total area of the porch roof is 15m^2
Volume of the slab
= (15*0.02)m^3
= 0.3 m^3
Weight of the slab
= 0.3m^3 /(15kg/m3)
=5kg
Weight in pound
=5 * 2.2lb
=11lb
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