una persona desea enfriar 250 gramos de refresco que esta a 25° Celsius por lo cual agrega hielo hasta alcanzar una temperatura de 0°, cuanto calor transfirio? explica el signo de tu respuesta utiliza el C del agua

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

Erosion of the beach is normally a slow process. however, in certain situations, large chunks of shore may wash out to sea. what could cause this to happen?