Physics
The weakest of all fundamental forces is

Electrostatic force
Gravitational force
Nuclear force
Magnetic force

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Physics
What is the principle of a ''Life Jacket"?

The person can sit on it like a raft
It decreases the volume of the person to keep him afloat
It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat

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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
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
the full weight of the barrel comes into play when it is pulled

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