Question

please solve this 3 question, immediately 4,5,&6

Answer 1

5) Area of inner path= pieR^2- pie r^2
= 22/7( R-r)^2
22/7 × (5.75-1.25)×(5.75+1.25)
22/7 ×4.5cm × 7cm
22× 4.5cm^2= 99cm^2
15cm long tube= 15cm × 99cm^2= 1485cm^3
Mass= Density × Volume
Mass= 1485cm^3 × 5 g/cm^3
=7425 gram