F. Answer these questions.
1. Why do we feel hot when we sit under the sun directly?
2. Why are freezers placed at the top of refrigerators?
3. Two identical cups of cocoa are kept on a table.One has a metal spoon in it and the other does not. After 5 minutes, which cocoa cup will be
cooler?
4. Several days after the end of a snowstorm, the roof of a house gets completely covered with snow. Another house has no snow on its roof.
Which house is better
insulated?
5. Why are the tumblers, used to sip hot drinks,not made of metals?
Answers
Answer:
1.The light radiated by our sun carries energy, part of which gets absorbed and transformed into heat when it reaches a surface. That is why places in the sun feel warmer than those in the shade. Another part of the light is reflected. That part makes surfaces look lighter and brighter in sunlight.
2. the freezer in a refrigerator is fitted near the top so that it can cool the whole interior by setting up convection currents.
Explanation:
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Answer:
1 The heat from the Sun flows as infrared radiation which is also a part of sunlight causes a sensation of warmth. BECAUSE THE SUN RAYS DIRECT COME ON US, AND WE FEEL HOT AND SWEATY
2 When the freezer is placed on top, the cold air produced from it is denser than the warmer air in the bottom. So cold air being dense sinks down and the warm air is forced to rise up so when the warm air rises up it and gets cold in the freezer. ... Here is why freezer is placed at the top.
3 THE CUP WHICH HAS A METAL SPOON WILL BE COOLER BECAUSE METALS EASILY GAIN AND LOSE HEAT. SO THE SPOON TAKES HEAT FROM COCA CUP AND LOSE IT INTO ATMOSPHERE.
4 The house that looses the snow fast has a heat lost issue from the inside of the house.
5 tumblers, used to sip hot drinks are not made of metals because metals absorb heat and the non metal does not absorb heat