Q12 of 94 Page 222

The volume of a block of gold is 0.5 m3. If it is hammered into a sheet to cover an area of 1 hectare, find the thickness of the sheet.

It is given that,

Volume of the block = 0.5 m3


We know that,


1 hectare = 10000 m2


Therefore,


Thickness of the sheet = volume/area


= 0.5/10000


= 0.00005 m


= 0.005 cm


= 0.05 mm


More from this chapter

All 94 →
10

A wall 15 m long, 30 cm wide and 4 m high is made of bricks, each measuring 22 cm x 12.5 cm x 7.5 cm. If of the total volume of the wall consists of mortar, how many 12bricks are there in the wall?

Hint. Volume of bricks in the wall = {(1500 x 30 x 400) x (1500 x 30 x 400)1 cm3.

 11

Find the capacity of a rectangular cistern in litres whose dimensions are 11.2 m x 6 m x 5.8 m. Find the area of the iron sheet required to make the cistern.

 13

The rainfall recorded on a certain day was 5 cm. Find the volume of water that fell on a 2-hectare field.

 14

A river 2 m deep and 45 m wide is flowing at the rate of 3 km/h. Find the quantity of water that runs into the sea per minute.