Question

The diameter of a rod is 4 cm. If the material weighs 9.42 kg and has a

density of 6 g/cm3 . find the length of the rod. (Take π=3.14)

Answer 1

125

Explanation:

R = 4 cm , r = 2 cm

weight = 9.42 kg --> 9420 g

density = 6 g/cm³

9420g/volume cm³ = 6 g/cm³

9420/6 = volume

1570 = volume

.

.

.

volume of a rod = 1570 cm³

πr²h = 1570

3.14×2×2×h = 1570

12.56×h = 1570

h = 125 cm

; length of the rod is 125 cm