Investigating Factors that Affect Heat Loss
PROBLEM
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I have been asked to investigate the link between colour and heat
loss. Does the silver or the black cup lose its heat faster?
HYPOTHESIS
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I think that the black cup will lose heat faster than the silver cup
because black absorbs heat, then releasing it out of the cup into the
surrounding air and surface, where as the silver cup will reflect the
heat back into the cup therefore keeping the water hotter for longer.
SCIENTIFIC KNOWLEDGE
Basically it is due to three factors CONDUCTION, CONVECTION and
RADIATION.
1. CONVECTION - the hot water in both cups will have convection
current in them. The hot water will rise and sink as the water begins
to cool. This means the heat energy is being passed on to the metal
cup over most of its inner surface.
2. CONDUCTION - the metal cups will get hotter as a result of the heat
energy inside the cup. The water will pass on this heat energy due to
the fact that metal is a good conductor of heat. The heat energy will
be conducted throughout the metal cup to the outer surface where it
will be transferred to the air around the cup as radiation.
3. RADIATION - hot objects (i.e. the metal cup) emit mainly INFRA-RED
radiation, and the hotter the object the more radiation it will emit.
How much radiation the object emits will depend on the surface. The
black cup had a dark matt surface and therefore will emit more
radiation. This will mean that the black cup will lose more infra-red
radiation than the silver cup (which is a poor emitter of infra-red
radiation) and as a result it will lose its heat quicker than the
silver cup over the same amount of time.
[IMAGE]
[IMAGE]
EQUIPMENT
The equipment that I used:
· Thermometer
· Metal cups (silver and black)
· Timer
METHOD
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As discussed in class, submission of your solutions to this exam will indicate that you have not communicated with others concerning this exam. You may use reference texts and other information at your disposal. Do all problems separately on clean white standard 8.5” X 11” photocopier paper (no notebook paper or scratch paper). Write on only one side of the paper (I don’t do double sided). Staple the entire solution set in the upper left hand corner (no binders or clips). Don’t turn in pages where you have scratched out or erased excessively, re-write the pages cleanly and neatly. All problems are equally weighted. Assume we are working with “normal” pressures and temperatures with ideal gases unless noted otherwise. Make sure you list all assumptions that you use (symmetry, isotropy, binomial expansion, etc.).