Question

A). A 200 cm3 block has a mass of 495 g. Find its relative density. (Density of water = 1g/cm3 )


B.) Big trucks and tractors have broad tyres. Why?

Answer 1

A) Mass of block = 495 g
Volume of bock= 200cm³
Density= M/V = (495/200) g/cm³=2 .475 g/cm³
Relative density = density of object/ density of water = 2.475/1 = 2.475

B) As we know that pressure is inversely proportional to area so, trucks have big and broad tyres to reduce the pressure and prevent them from sinking.

Answer 2

A)
Mass of block = m = 495 g

Volume of block= 200 cm³

Density = Mass/Volume
= 495/200
= 2 .475 g/cm³

density of water = 1 g/cm³

Relative density = density of substance/ density of water
= 2.475/1
= 2.475

B)
Pressure = Thrust / Area

Pressure is inversely proportional to area .
The trucks have big and broad tyres [ have more surface area ]
Hence , when surface area is more , pressure is less.
So , Big trucks and tractors have broad tyres to reduce pressure .