3 ohm resistor, an unknown resistor R, and two ammeters are connected as shown with a 12 v source. Ammeter A2 reads a current of 5.0 amperes.

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.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

What happens to an isotope during radioactive decay?