4. A copper kettle of mass 1 kg contains 0.9 kg of water at 15°C. It takes 12 minutes to rise the temperature to 95°C. If the electric energy is supplied at 220V, calculate the electric current, assuming 10% of heat is wasted. Given specific heat of copper = 420 J kg-K-1 and specific heat of water = 4200 J kg-1 K-1.​

After an atomic bomb has been dropped, the damage continues to get worse. why is this?

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

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