Physics
What is the direction of torque?

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

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a higher thermal conductivity than metals
Plastics have a lower density than metals
Metals are good conductors of heat
Metals have higher thermal capacity than plastics

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