La catodul unei băi electrolitice prin care circulă un curent electric cu intensita- tea de 2,5 A în 50 min. s-au depus 4,65 g de cositor. Să se determine:
a) echivalentul electrochimic al cositorului;

b) intervalul de timp în care la catod s-ar depune 8,37 g de cositor la o intensitate
a curentului prin baie egală cu 7,5 A.

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].

What was the first instrument to ever record an earthquake?