In which era human beings and dinosaurs lie ?

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Q. Determine the amount of heat to be taken out a price of hot iron block of mass 300gm to cool it from 300 C to 20 C? Specific heat of iron = 480 J/kgC Soln: Mass of iron (m) = 300gm = 0.3kg Sp. Heat Capacity (S) = 480 J/Kg0C Change in temperature (dt) = 300 -20 = 2800C Quantit ...
Q.In a house, four bulbs each of 60 watt glow for 5 hrs and an electric heater of 1200 watt is used 2 hrs every day. If the minimum charge up to 20 units is Rs. 80 and the charge for 21 units to 250 units is Rs. 7.30/unit, calculate the cost of electricity consumed in a month. Soln: For 4 bulbs: Power (p) = 4 * 60 = 240 watt = 0.24 kw Time (t) = 5 hrs Power consumption (PC1) = p * t = 0.24 * 5 = 1 ...
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