- Thu Aug 16, 2018 1:06 pm
The heavy object is being placed in the center of the sheet of glass, and so the glass under it will flow away from it to the edges that are not under pressure. The problem with answer A is "uniform" - what evidence is there that the entire sheet of glass will be the same thickness everywhere, at the center and at all the edges? It will certainly get thinner at the center, but it could then get thicker just beyond the area where the heavy object is sitting. Picture a cookie sheet filled with pudding, and place a cup in the center - the pudding moves out from under the cup, and the other areas of the cookie sheet rise up. Not uniform thickness, but just the opposite!
Is it possible that the glass will get larger and remain of uniform thickness? Perhaps, but that seems less likely than some parts getting thicker, just outside the range of the heavy object, while remaining at or close to the original thickness out at the edges. With little pressure on the rest of the glass there isn't anything forcing it to flow. The stimulus did say that the portion under pressure will flow, and it also said the flow is to areas under less pressure. Less pressure means less flow, presumably. Less flow means less change. We will end up with a distorted thickness rather than uniformity.
Adam M. Tyson
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