Question

Give reason for the following: (a) iron rims are heated red hot before fixing them on cart wheels

Answer 1

on heating the rim expands. And can easily lie down on wheel. When it cools, it contracts and press tightly onto the wheels.

Answer 2

Explanation:

the metal rim to be put on a cart wheel is designed to have a smaller diameter than that of the wheel .when this rim is heated it become 'red hot'.

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