Molecular Physics | Thermodynamics Answers

An unclothed person whose body has a surface area of 1.40m^2 with emissivity of 0.85 has a skin temperature of 37°C and stands in a 20°C room. How much energy does the person lose per minute?

Ten kilograms of steam at 100°C is condensed is 500 kg of water at 40.0°C. What is the resulting temperature?

How much heat is required to change 10 g of ice at exactly 0°C to steam at 100°C.

Determine the amount of heat required to boil a 20L of water. How much heat is needed to convert it completely into steam.

A steel railroad rail expands and contracts according to the formula Δl = 𝛼lΔT,

where Δl is the change in length, 𝛼 is a constant called the coefficient of linear expansion, l is the original length, and ΔT is the change in temperature. If a 50.0 ft steel rail is installed at 0°F, how many inches will it expand when the temperature rises to 190°F? (𝛼 = 6.5 ✕ 10⁻⁶/°F.

What is the speed of sound (in m/s) in carbon dioxide at the normal boiling temperature of water?

Consider a sphere of radius R. It is a three-dimensional shape that is bounded by its surface area, a two-dimensional shape. The mathematical equation for the sphere is:

R2 = x² + y² + z². Write the expression for volume (enclosed quantity) and the surface (bounding quantity) of this sphere.

Generalize the expression for the number of system states that you will get, Ω, for N number of six-sided dice.

a) 0.056m³ of air at 1.38 bar are compressed isothermally to a volume of 0.014m³. 

Determine the work energy required for the compression.

b) compare this to the work energy which would be required for an adibatic compression through the same volume ratio. For air R= 0.287KN and ➰ = 1.4

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