Acurrent of 200 a is passed through a stainless-steel wire [k = 19 w/m · ◦c] 3 mm in diameter.
the resistivity of the steel may be taken as 70 μ\omega · cm, and the length of the wire is 1 m. the
wire is submerged in a liquid at 110 ◦c and experiences a convection heat-transfer coefficient of
4kw/m2 · ◦c.
a) if the current changes from 200 a to 300 a, what will the temperature be at the center?
b) with a current of 300 a, what is the temperature 0.5 mm from the outer surface of the wire?
c) what is the maximum current of the wire? [take melting point of stainless steel as 1363 ◦c]

How many grams of magnesium metal will react completely with 8.3 liters of 5.5 m hcl? show all of the work needed to solve this problem. mg (s) + 2hcl (aq) → mgcl2 (aq) + h2 (g)

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable