F3 Physics (ENG)

1. Baba is going to make a bowl of fish ball noodles. The mass of each fish ball is 80g.

(a). Baba puts two fish balls at 2℃into 800g of water at 20℃. After a few minutes, he heats the fish-ball-amd-water "mixture" over a stove. Take the specific heat capacity of the fish ball as 2400 J kg^-1 ℃^-1 and the specific heat capacity of the water as 4200 J kg^-1 ℃^-1.
(i). What is the temperature of the "mixture" before it is heated?
(II). If it takes 5 minutes to heat the "mixture" up to 90℃, what is the power of the stove?

(b). He then puts 500g of noodles at 15℃into the water. It takes another 1 minutes to heat the "mixture" up to 90℃ using the same setting. What is the specific heat capacity of the noodles?

2. In a freezing winter, a hot water bag with 300g of water is placed in an open area. The temperature of the water inside the hot water bag is 80℃and the surrounding temperature is 12℃. After 15 minutes, the temperature of the water becomes 65℃. How much energy is released to the surroundings from the hot water?
(The specific heat capacity of water is 4200 J kg^-1 ℃^-1. Assume the specific heat capacity of the bag itself is negligible.)

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