¿Cuánta agua (a 15°C) se debe mezclar con 2kg de hierro, para hacer que la temperatura del hierro baje desde 250°C, hasta a una temperatura de equilibrio de 25°C?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.

You want to move a heavy box with mass 30.0 kg across a carpeted floor. you pull hard on one of the edges of the box at an angle 30∘ above the horizontal with a force of magnitude 240 n, causing the box to move horizontally. the force of friction between the moving box and the floor has magnitude 41.5 n . what is the box's acceleration just after it begins to move