Do you know the perfect number?
A perfect number can be expressed by the sum of its positive divisors except itself. For example, the specified divisors […]
Category: Physics
If a major league pitcher throws a ball against gravity, …
Suppose the pitcher can always throw a ball at 100 mi/h. If he throws vertically upward with that speed against […]
Need physics help?
Hi there! Are you taking introductory physics courses? Are you doing well in the class? Do you need any help […]