Objects and are placed in a warm bath at temperature t0=60∘c. object has initial temperature −20∘c and cooling constant 0.004 s−1. object has initial temperature 10∘c and cooling constant 0.002 s−1. after how many seconds will the objects have the same temperature?

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.

Observations show that interstellar clouds can have almost any shape and

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current