1 To keep the canned food from freezing in a storage cellar, a farmer places a t
ID: 1458690 • Letter: 1
Question
1 To keep the canned food from freezing in a storage cellar, a farmer places a tub of water in the cellar. Explain.
2 Why is it safe to stick your tongue on a wooden pole on a cold winter day, but not on a metal pole?
3 You are in the frozen food section of the grocery store and you notice that your hand gets cold when you place it on the glass windows of the display cases. Your friend says this is because coolness is transferred from the display case to your hand. What do you think?
4 Why are good conductors of electricity usually also good conductors of heat?
Explanation / Answer
1)1cal/g deg c=4.186J/g deg c
it is higher than any other common substance,so water plays an important role in temperature regulation:so the amount of heat given by water prevents the food.
2)
Heat from your blood warms the moisture through a process calledconduction . Heat energy from the blood excites atoms in your tongue. The atoms absorb energy and vibrate. The more they vibrate, the more their temperatures increase. This incites vibrations in neighboring atoms, which take the energy and pass it up the line like a hot potato and eventually warms the surface moisture.
frozen metal cools the surface of tongue.
metal is a strong thermal conductor.it pulls heat from your tongue much faster than your body can replenish it.
3)transfer of heat from our body to glass window display cases takes place.
4)See both of these concepts go hand in hand with each other. Because electricity means movement of electrons from one point to another causing an electric current. So when this movement of electrons increases inside the conductor, this process induces some kind off heat produced due to internal friction of the electrons or we can also say the internal collection of these accelerated electrons.
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