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10 problems. P1: 'Energy to heat 3kg of water by 50°C. Q = ___ J' (630000). P2: 'A 2kg iron block (c=450) absorbs 9000J. Temperature rise = ___ °C' (10). P3: 'A 0.5kg metal absorbs 2250J, rising from 20°C to 30°C. c = ___ J/kg°C' (450, iron). P4: 'Energy to heat 0.2kg of copper (c=390) from 25°C to

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