.A coal-burning factory produces 1225MW of electricity per day and runs at 35%efficiency(η). Determine how much water will be needed daily to cool down the hot steam fromthe combustionin order to runthe plant if the water comes from a nearby Lake and has aaverage temperatureof 150C,5% of the emitted heatfrom the combustionis lost to thesurroundings(i. e., heating up the pipes and energy of the exhaust gas in the stack),and thewater is i) evaporated in a cooling tower or ii) recycled and returnedto the lake at 350C. Forcoal: cp= 2kJ/kg/°C; cv= 1.75kJ/kg/°C;heat released by combustion, or ΔH = 5kW/kg.1Watt = 1J/s

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0