What is the mechanical advantage of a lever if the input force is 24m from the fulcrum and the load is 3 m from the fulcrum?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?

While carrying a heavy box up the stairs,you set the box on a step and rest. then you pick up the box and carry it to the top of the stairs. describe these actions in terms of balanced and unbalanced forces acting on the box.