Physics
If the distance between Sun and Earth becomes double, then the gravitational force on Earth will be

Double
Same
One Fourth
Half

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Physics
Skating on ice is possible because

Ice is cold
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The pressure on the ice due to skate raises its melting point
The surface of ice is smooth

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

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
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

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