1. If you have ever watched the launching of an Earth satellite, you may have noticed that the rocket starts vertically upward, then veers from a vertical course, and continues its rise at an angle....

1. If you have ever watched the launching of an Earth satellite, you may have noticed that the rocket starts vertically upward, then veers from a vertical course, and continues its rise at an angle. Why does it start vertically? Why doesn’t it continue vertically?

2. A satellite can orbit at 5 km above the Moon but not at 5 km above Earth. Why?