Give reasons for the following.

Metal tyres of cart wheels are fitted when hot.

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Solution

It is done so that on cooling, when the tyre contracts in volume, its circumference fits the wheel tightly.

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Similar questions

Give reasons why :

(a) Travelling bags have wheels.

(b) Iron pipes are fitted on an inclined plane for pushing up heavy loads.

(d) We should use a pulley to draw water from a well.

1.0 m

6 mm

3.6 \times 10^{- 5} /^{\circ} C

Statement

All cars are tyres

All wheels are tyres

All tyres are trains

Conclusions

I. All cars are trains

II. Some trains are wheels

III. Some trains are tyres

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