The ceiling of a single-family dwelling in a cold climate should have an r-value of 46 ft2 ·f°·h/btu. to give such insulation, how thick would a layer of (a) polyurethane foam and (b) silver have to be? the thermal conductivity of polyurethane foam is 0.024 w/m·k, and the thermal conductivity of silver is 428 w/m·k.

What is the relationship between the wavelength of a wave and it's energy?

Will give brainliest! which statement best describes the similarities between fundamental forces? electromagnetic and strong nuclear forces influence the interaction between charged particles within an atom. gravitational and magnetic forces are both types of charges that occur in nature. nuclear and magnetic forces are both related to mass and weight. strong nuclear force is most like electrical force because they are both related to distance.

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles