What are some Future developments for wind energy?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force

Two cans on a sunny window one black and the other white construct and explanation of the effect of sun will have on both cans over a two hour period?

Element with 3protons and 5neutrons