suppose u r told that the linear size of everything in the universe has been doubled overnight.can u test this statement by measuring sizes with a metre stick?can u test it by using the fact the speed of light is a universal constant and has not changed?what will happen if all the clocks in the universe also start running at half the speed?
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since doubling the size of universe will double linear size of anything present in it so we can't measure it by any meter scale. ... but if we combine both the phenonmena of doubling the linear size and halving the speed of clocks then it can't be measured by taking speed of light as universal constt. also.
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Every magnet has two sides: a north pole and a south pole. We use these names because if you hang a magnet from a thread, the magnet's north pole points (almost) towards the north direction. This is because the Earth's core (its centre) is a large, weak magnet.
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