Answered

A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of the bar after the temperature change? 

A0.0000189 meterB. 0.00002363 meterC. 0.124764 meterD. 0.00023635 meter

Verified Answer :

W0lf93

The answer is C C. 0.124764 meters. When a metal (or almost any item save water) is cooled, it shrinks, as the atoms that make it up vibrate less and less and causes the item to contract. The reverse happens when heating, as the atom vibrate faster causing it to expand. Now, even though it would shrink, the shrinkage would not be that noticeable to the naked eye, and thus, the other lengths are just FAR too short to occur.

Explanation:

Δ
L =
18.8 ×
10 − 6 . 0.125 (100−200) =

2.35 ×10^4 m
=

−
0.235
m
m

So the bar should shrink

0.235
m
m

giving a new length of (changing in mm):

125
−
0.235
= 124.7
mm

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