4. Normal human body temperature is 310 K. (a) What is the peak wavelength emitted by a person with this temperature?
(b) What part of the spectrum does that wavelength lie in?
(c) If the surface area of a person is about 1.5 m2, what is their luminosity?
(d) How does that luminosity compare to a 100W(109erg s−1) light bulb?

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).

Contains chemical energy. a. heat b. light c. natural gas