The pressure on earth will be least when the man is

Options

A. lying
B. sitting
C. standing on one foot
D. standing on two feet

Answer

To determine when the pressure on the Earth is least for a man, we need to understand the relationship between pressure, force, and area. Pressure is defined as the force applied per unit area. The formula for pressure (P) is:

\[ P = \frac{F}{A} \]

Where:
- \( P \) = pressure
- \( F \) = force (which is equal to the weight of the man)
- \( A \) = area over which the force is distributed

### Step-by-Step Solution:

1. **Understanding Pressure**:
- Pressure is inversely related to the area over which a force is applied. This means that if the area increases, the pressure decreases, and vice versa.

2. **Consider Different Positions**:
- We need to analyze the four positions: lying down, sitting, standing on one foot, and standing on two feet.

3. **Lying Down**:
- When a man is lying down, the entire surface area of his body is in contact with the ground. This maximizes the area (A) over which his weight (force, F) is distributed.

4. **Sitting**:
- When sitting, only a portion of the body is in contact with the ground, which reduces the area compared to lying down. Thus, the pressure will be higher than when lying down.

5. **Standing on One Foot**:
- Standing on one foot means that the weight of the man is concentrated on a very small area (the foot), resulting in a high pressure.

6. **Standing on Two Feet**:
- Although standing on two feet distributes the weight over a larger area than standing on one foot, it is still less than the area when lying down.

7. **Conclusion**:
- Since lying down provides the maximum area of contact with the ground, it results in the least pressure on the Earth. Therefore, the answer is that the pressure on Earth will be least when the man is lying down.

### Final Answer:
The pressure on Earth will be least when the man is **lying down**.

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