When you need to lift a heavy weight, a pulley can make…

When you are calculating the amount of mechanical energy used to exert…

Electric motors are often rated by one of two methods: amperes (amps)…

Resources are products from the environment that are useful to humans and…

Plants, algae and all organisms that use photosynthesis to produce energy support…

A biome is a major ecosystem spread over a wide area and…

If you’ve ever bought clothes on sale, you’re familiar with the concept…

Not all pennies are created equal; since the US cent coin first…