¿que es la energia interna?

Elements that have one valence electron and are very reactive are called

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

If we compare and contrast the three seen in the jar , the best explanation would be that