(^70) Aptitude Test Problems in Physics
load is then removed, the elongation of the
rod will decrease along CD which for the
sake of simplicity will be taken straight and
parallel to the segment AB (Fig. 69). There-
Fig. 69
fore, after the load has been removed com-
pletely, the rod remains deformed (point
D in the figure). Let us suppose that the rod
is initially stretched by Al = x > xo and
then the load is removed.
Determine the maximum change AT in
the rod temperature if its heat capacity is
C, and the rod is thermally insulated.
2.41. A thin-walled cylinder of mass m,
height h, and cross-sectional area S is filled
with a gas and floats on the surface of water
(Fig. 70). As a result of leakage from the
lower part of the cylinder, the depth of its
submergence has increased by Ah.
Determine the initial pressure pi of the
gas in the cylinder if the atmospheric pres-
sure is Po, and the temperature remains
unchanged.
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