Si un tren va a una velocidad constante de 70 m/s cual es la fuerza resultante del tren

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.