سلك طوله 2 متر و معامل مرونته 2×10¹¹ نيوتن/م² وجد أن 4×10⁸ ، احسب اكبر استطالة في طول السلك دون أن يفقد مرونته؟

How have the competing explanations' experiments on atoms affected the development of the atomic model?

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.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?