Why an astronaut in an orbiting space craft is not zero gravity although he is in weight lessness?

Explanation

To understand why an astronaut in an orbiting spacecraft does not experience zero gravity, despite feeling weightless, we need to break down the concepts of gravitational force, centrifugal force, and the sensation of weightlessness.

### Step-by-Step Solution:

1. **Understanding Gravitational Force**:
- The gravitational force acting on an astronaut is given by the formula:
\[
F_g = \frac{GMm}{(R + h)^2}
...