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saurabhjain

A vertical plate and a horizontal plate are suspended in an open room. Both are heated to the same temperature. Which one will cool first? Why?

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I believe vertical plate will cool down first. It's free convection mechanism that drags the cold air up along the wall due to pressure difference (hot air in the border area has lower density). Horizontal plate resists the flow in vertical direction, and thus convective heat transfer coefficient is lower in that case.

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horizontal plate is placed at what height with respect to vertical plate

at the bottom...middle....at the top which is not clear in the question

so cooling depends on the position

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The horizontal plate should cool faster since it's top surface is in contact with atmospheric air which is applied vertically to surface of the plate to dissipate heat faster.

The answer is only a logical response and not intricate engineering solution.

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