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An autmobile travelling at 80 km//h has tyres of 75.0 cm diameter. What is the angualr speed of the tyres about their axles ? If the car is brought to stop uniformly in 30 complete turns of the tyres without skidding, what is the magnitude of angular acceleration of the wheels ? How far does the car move during the braking ?

Name the products obtained on complete combustion of hydrocarbons? How is the gas evolved during combustion tested in the laboratory? Explain in brief.

Copy the following drawing on squared paper. Complete each one of them such that the resulting figure has two dotted lines as two lines of symmetry. How did you go about completing the picture?

Copy the following drawing on squared paper. Complete each one of them such that the resulting figure has two dotted lines as two lines of symmetry. How did you go about completing the picture?