Suppose a person is covered head to foot by wool clothing with an average thickness of d = 1.95 cm and is transferring energy by conduction through the clothing at the rate of Q / Δt = 45 W.       What is the temperature difference, in terms of the quantities given in the problem statement, across the clothing? Denote

The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about 0.20 W/m · K and 0.020 W/m · K respectively, while other tissues inside the body have conductivities of about 0.50 W/m · K. Assume that between the core region of the body and the skin surface lies a skin layer of 1.0 mm, fat layer of 0.50 cm, and 3.2 cm of other tissues. (a) Find the R-factor for each of these layers, and the equivalent R-factor for all layers taken together, retaining two digits. Rskin      m2 · K/W Rfat      m2 · K/W Rtissue      m2 · K/W R      m2 · K/W (b) Find the rate of energy loss when the core temperature is 37°C and the exterior temperature is 0°C. Assume that both a protective layer of clothing and an insulating layer of unmoving air are absent, and a body area of 2.0 m2. W

A silver block, initially at 56.9 ∘C∘C, is submerged into 100.0 gg of water at 24.1 ∘C∘C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 27.4 ∘C∘C.     What is the mass of the silver block? Express your answer to two significant figures and include the appropriate units.

The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is good approximation to assume that the emissivity e is equal to 1 for these surfaces. Answer Part A and B.