A small crucible containing 400. g of gold is heated to the temperature of a small furnace, and then the gold is dropped into 1000. g of water at 10°C. If the final temperature comes to 20.0°C, find the temperature of the furnace. Neglect heat losses to any container.​

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Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?