1) Why do we have a cooling system in an engine?
- To keep the constant temperature.
2) Why do tyres have a thread?
- To...
3)Why do vehicles carry a spare tyre?
- To change and push it but puncture.
4) Why do traffic police wear a safety vest?
- To have visibility respect the others vehicles.
5) Why do cam profile affect RPM´S?
- To open more the large of valve.
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