It can be observed that 1 round of wire will cover 3 mm height of cylinder.
Length of wire required in 1 round = Circumference of base of cylinder = 2πr = 2π × 5 = 10π
Length of wire in 40 rounds = 40 × 10π
=(400 x 22)/7 =8800/7
=1257.14 cm =12.57 m
Radius of wire =0.3/2 = 0.15cm
Volume of wire = Area of cross-section of wire × Length of wire
= π(0.15)2 × 1257.14
= 88.898 cm3
Mass = Volume × Density
= 88.898 × 8.88
= 789.41 gm