Physics
What is found in frequency modulation ?

Fixed frequency
Change in frequency and dimension
Fixed dimension
Change in dimension only

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

the rolling friction is much less than the sliding friction
the full weight of the barrel comes into play when it is pulled
coal tar is a liquid and it flows in the barrel when it is rolled
more surface area of the barrel is in contact with the road when it is pulled

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