Consider the following objects: (A) water in a cup at 10°C. (B) water in a cup a
ID: 1458640 • Letter: C
Question
Consider the following objects: (A) water in a cup at 10°C. (B) water in a cup at 60°C. (C) copper block at 10°C. (D) copper block at 60°C. (E) piece of wool at 10°C. (F) piece of wool at 60°C. Rank the objects from hottest to coldest based on how they would feel if you touched them with your bare hand (note: typical skin temperature is 32°C). Ties are possible. Use the symbols > and = to indicate your ranking, listing any that are equal in alphabetical order. For example, if Y and Z are the same and are both greater than X, then you would enter Y=Z>X (note: Z=Y>X would be incorrect, since Y and Z, being equal, must be in alphabetical order). FEELS HOTTEST FEELS COLDEST
Explanation / Answer
How hot or cold an object feels depends on how quickly heat is transferred to or from the skin, thus depending on the object's conductance as well as it's temperature.
In terms of conductance, copper > water > wool.
Thus, in order of hottest to coldest,
D, B, F, E, A, C.
which is
(D) copper block at 60°C.
(B) water in a cup at 60°C.
(F) piece of wool at 60°C.
(E) piece of wool at 10°C.
(A) water in a cup at 10°C.
(C) copper block at 10°C.
(Copper a 60 degrees feels hottest, copper at 10 degrees feels coldest.)