Physics

Physics

Problem

A cup of tea at 90∘C90^{\circ}\text{C} is left to cool in a room maintained at 25∘C25^{\circ}\text{C}. Its temperature drops to 70∘C70^{\circ}\text{C} after 55 minutes. Find the cooling constant kk (correct to three decimal places). a) 0.054 min−10.054\,\text{min}^{-1} b) 0.074 min−10.074\,\text{min}^{-1} c) 0.032 min−10.032\,\text{min}^{-1} d) 0.062 min−10.062\,\text{min}^{-1}

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