A rectangular block on the top of a table is kept in such a manner that its various sides touch the table. In different situations, this block imposes-

Options

A. Uniform thrust and uniform pressure
B. Uniform thrust and different pressure
C. Different thrust and uniform pressure
D. Different thrust and different pressure

Explanation

To solve the problem regarding the rectangular block on the table and the thrust and pressure it imposes, we can break it down into the following steps:

### Step 1: Understand the Definitions
- **Thrust**: Thrust is defined as the perpendicular force exerted by an object on a surface. In this case, the weight of the rectangular block acts downwards due to gravity, creating a thrust on the table.
- **Pressure**: Pressure is defined as the force exerted per unit area. It is calculated using the formula:
\[ \text{Pressure} = \frac{\text{Force}}{\text{Area}} \]

### Step 2: Identify the Forces Acting on the Block
- The weight of the block (W) acts downwards due to gravity. This weight is the force that creates thrust on the table.

### Step 3: Analyze Different Situations
- When the block is placed on different sides (e.g., on its length, width, or height), the area of contact with the table changes.
- The thrust remains constant as it is equal to the weight of the block, but the pressure will change depending on the area of contact.

### Step 4: Calculate Pressure for Different Orientations
- If the block is placed on its length (L) and width (W), the area of contact is:
\[ A_1 = L \times W \]
- The pressure exerted on the table in this orientation is:
\[ P_1 = \frac{W}{A_1} = \frac{W}{L \times W} \]

- If the block is placed on its width (W) and height (H), the area of contact is:
\[ A_2 = W \times H \]
- The pressure in this orientation is:
\[ P_2 = \frac{W}{A_2} = \frac{W}{W \times H} \]

- Similarly, for the height (H) and length (L):
\[ A_3 = H \times L \]
- The pressure is:
\[ P_3 = \frac{W}{A_3} = \frac{W}{H \times L} \]

### Step 5: Conclusion
- The thrust remains constant regardless of the orientation of the block, as it is determined by the weight of the block.
- The pressure varies depending on the area of contact with the table. Thus, different orientations of the block will result in different pressures being exerted on the table.