A thermally insulated cubical box of side length 20 cm and wall thickness 2 cm...

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A thermally insulated cubical box of side length 20 cm and wall thickness 2 cm containing 2 kg of ice is closed on all sides The mass of ice melted in 10 hours is Thermal conductivity of the material of the box 0 01 Wm K latent heat of ice 360x103 J kg and ambient temperature 40 C 508 508 y 30 Jurbed Options 3 4 1 52 kg 1 25 kg 1 64 kg 20 cm 5065 2 cm Ke as goods 40 C 0 48 kg a 10 Kobe 8 So for song 0 01 Wm K 500 500 360 10 J kg 350 52 kg 70 107

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