2. A kettle aluminum made of mass 0.35 kg of the initial temperature 15°C, then it is given heat of 25,000 J. What is the temperature of the kettle now? (Specific heat of aluminum is 900 J/kg°C) (5 points)
3. A cup of hot tea is let first until warm before it is drunk. The temperature of the hot tea decreases from 80 °C to be 45 °C by releasing heat of 60 kJ. What is the mass of tea in the cup? (Suppose the specific heat of tea is equal to the specific heat of water) (5 points)
4. Heat of 32,500 J can increase the temperature of the body from 15°C until 45°C. What is the heat capacity of the body?(5 points)
5. Look at the graph and calculate the heat required 100 g of ice to reach point E (heat specific heat of ice is 2,100 J/kg°C and melting heat is 336,000 J/kg and evaporating heat is 2,260,000 J/kg.
(15 points)
6. How much power does it take to lift 30 N, 10 m high in 5 s? (5 points)
7. You move a 25 N object 5 meters. How much work did you do? (5 points)
8. Give 3 ways of heat transfer. (3 points)
9. Give 3 applications of heat. (3 points)
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