1. A 100kw electric heater heats up 100L of water at 20°C for 2 minutes. If 1L of water has a mass of 1kg find the final temperature of water. Specific heat capacity of water is 4200J/kg/°C.
2. A store hotplate is rated at 1kw. How long will it take for 1.5L (1.5kg) of water initially at 10°C to start to boil. Specific heat capacity = 4200J/kgk
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