1. Experiment: Prepare two cups of styrofoam with equal amounts of water at the
ID: 1661642 • Letter: 1
Question
1. Experiment: Prepare two cups of styrofoam with equal amounts of water at the same temperature and place equal amounts of ice in them. With an insulating (non-metallic) stick, stir the contents of one of the cups until all the ice melts. Record the elapsed time. Check that there is still a lot of ice in the other cup. Explain Where does the energy that melts the ice in each cup come from? A) We hang a stone from a scale and submerge it in water. We see that the stone displaces half a liter of water and that the balance marks 10 N. The buoyant force on the stone is The weight of the previous stone is The temperature of an object measures The lowest possible temperature is__.Explanation / Answer
We know that heat flows from high temperature to low temperatures. In given synerio water is at higher temperature than ice.
When the water is not stirred then a limited number of water molecules are in touch with ice molecules therefore the heat transfer between the two types in restricted.
But when we stirr the water we bring more molecules of water in contact with ice this exponentially increases the melting process of water and hence we get colder drink much faster than by just keeping the ice in the solution.
So basically we convert the kinetic energy by stirring into heat energy. The kinetic energy of stirring is used to melt the ice.
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