A thin film of water is formed between two straight parallel wires each of length 8 cm separated by distance of 0.6 cm . The work done to increase the distance between the wires to 0.8 cm is (Surface tension of water $=0.07 \mathrm{Nm}^{-1}$ )
A rain drop of diameter 1 mm falls with a terminal velocity of $0.7 \mathrm{~ms}^{-1}$ in air. If the coefficient of viscosity of air is $2 \times 10^{-5} \mathrm{~Pa}$-s, the viscous force on the rain drop is
The temperature at which the reading on Fahrenheit scale becomes $90 \%$ more than the reading on Celsius scale is
A rectangular ice box of total surface area of $1000 \mathrm{~cm}^2$ initially contains 1.5 kg of ice at $0^{\circ} \mathrm{C}$. If the thickness of the walls of the box is 2 mm and the temperature outside the box is $42^{\circ} \mathrm{C}$, then the mass of the ice remaining in the box after 160 minutes is
(Thermal conductivity of the material of the box $=10^{-2} \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ and latent heat of the fusion of ice $=336 \times 10^3 \mathrm{Jkg}^{-1}$ )
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