Q10 of 94 Page 228

An iron beam is 9 m long, 40 cm wide and 20 cm high. If 1 cubic metre of iron weighs 50 kg, what is the weight of the beam?

We know that,

Volume of a cuboid = Length × Breadth × Height


= 9 × 0.4 × 0.2


= 0.72 m3


Therefore,


Weight = 0.72 × 50


= 36 kg

More from this chapter

All 94 →
8

Two cubes have their volumes in the ratio 1 : 27. The ratio of their surface areas is

 9

The surface area of a (10 cm x 4 cm x 3 cm) brick is

 11

A rectangular water reservoir contains 42000 litres of water. If the length of reservoir is 6 m and its breadth is 3.5 m, the depth of the reservoir is

 12

The dimensions of a room are (10 mx8mx 3.3 m). How many men can be accommodated in this room if each man requires 3 m3 of space?