Physics
Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.

Shining black
Shining white
Rough white
Rough black

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Physics
What is the direction of torque?

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

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