Answer the following questions in short :
1. Explain with an example why measurement of time is important and necessary?
2. Name three methods of finding time used earlier before the invention of clock.
3. What were the drawbacks of a mechanical clock?
4. What is the speed of an object covering 15 km in 20 minutes?
5. What do you understand by the uniform motion?
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1.The receiver measures travel times by comparing 'time marks' imprinted on the satellite signals with the time recorded on the receiver's clock. ... For this system of measurement to work, all satellites need to be synchronised so that they can start transmitting their signals at precisely the same time.
2.There was another more advanced shadow clock or sundial in use by the ancient Egyptians around 1500 BC. This shadow clock or sundial permitted one to measure the passage of hours within a day. Another very early form of clock to tell the time was the water clock. The water clock was used by the ancient Greeks
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