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

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
The person can sit on it like a raft

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Physics
What is the direction of torque?

Parallel to the radius
Same as the direction of applied force
Opposite to the direction of applied force
Perpendicular to the direction of applied force

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