Physics
A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

Will decrease
Will increase
Varies with the increase of depth of the immersion of the iron piece
Does not change

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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 full weight of the barrel comes into play when it is pulled
more surface area of the barrel is in contact with the road when it is pulled
the rolling friction is much less than the sliding friction

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