Page 83 - WCS - Electrical

WORKSHOP CALCULATION & SCIENCE - CITS

2 Calculate volume of a cube where side is 9 cm

a = 9 cm
V = ?
V = a³
= 9 x 9 x 9

= 729 cm³
3 Find out side of the cube if a cube has volume of 3375cm³.
V = 3375 cm³
a = ?
a³ = 3375

a =
= 3x3x3x5x5x5
= 3 x 5

= 15 cm
4 Find the side of a cube, if its surface area is 216 cm²
Surface area = T.S.A = 216 cm²
6a² = 216

216
a² =
6
= 36

a = 36
= 6 cm
5 Find the side of the square tank, if its height is 2 metre and has the capacity to hold 50,000 litre of water.
Height of square shape tank (h) = 2 m
Capacity = 50,000 litre

1000 litre = 1 m³
50000
50,000 Litre =
1000
= 50 m³

Capacity of tank = 50 m³
a² x h = 50
a² x 2 = 50
50
a² = = 25 m²
2
a = 25 = 5 m

Side of the square tank = 5 m

70

CITS : WCS - Electrical - Exercise 6