Physics
Which alternative energy source is exhaustible?

Geothermal energy
Tidal energy
Solar energy
Wind energy

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

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

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