Question

the external dimensions of a wooden box closed at both ends are 24cm, 16cm, 10cm respectively and thickness of the wood is 5mm.if the empty box weights 7.35kg, find the weight of 1 cubic cm of wood.
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Answer 1

Step-by-step explanation:

Dimension of a closed rectangular wooden box are 18cm,10cm and 6cm, respectively.

The thickness of wood is

2

1

cm

∴ Volume of rectangular wooden block =18×10×6=1080cm

3

And, volume of hollow space in rectangular wooden block =17×9×5=765cm

3

∴ Volume of rectangular wood =(1080−765)cm

3

=365cm

3

Now, weight of empty box =15kg

∴ Weight of a cubic cm of wood =

365

15

=

21

1

kg

Weight of box filled with sand =100kg

Weight of sand =(100−15)kg=85kg

∴ Weight of a cubic cm of sand =

765

85

kg=

9

1

kg