How could you use iron fillings to tell which of the two bar magnets is stronger

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?

The solid that is formed and usually sinks to the bottom of a solution is the