Question

Two cubical blocks have same dimension. Both of them are kept n sand. One block is of iron and the other of wood. Which one of them will exert a greater pressure?

Answer 1

The pressure exerted by iron block is more than that of the wooden block.

• We use the formula, Pressure = Thrust/Area
• Pressure = mg/Area
• As given, two cubical blocks have the same dimension, the area will remain the same for both of the blocks.
• Pressure_{i} = Thrust_{i}/Area
• Pressure_{i} = m_{i}g/Area ......(1)
• Pressure_{w} = Thrust_{w}/Area
• Pressure_{w} = m_{w}g/Area ......(2)
• The number of molecules present in iron is more than that in the wood. As the number of molecules is directly proportional to mass.
• Therefore, iron is much heavier than wood for the same volume. So, the pressure exerted by the iron block will be more than that of the wooden block.
• Using (1) and (2), we get,
• So, m_{i} > m_{w}
• Thus, Pressure_{i} > Pressure_{w}

Answer 2

Answer:

pata nahi

Explanation: