Bukhovtsev-et-al-Problems-in-Elementary-Physics

82
PROBLEMS
~ Fig. 141
force F will the rod act with on the walls if it is heated
by /)"t = 5°C?
The coefficient of linear thermal expansion of steel
a=I.lxI0-'deg- 1 and its modulus of elasticity E=
= 20,000 kgf/rnrn",
377. Two rods made of different materials are placed between
massive walls (Fig. 141). The cross section of the rods is A
and their respective lengths 11 and l.. The rods are heated by t
degrees.
Find the force with which the rods act on each other if their
coefficients of linear thermal expansion a l and a! and the moduli
of elasticity of their materials E; and £. are known. Disregard
the deformation of the walls.
I
I 1
Fig. 142
Fig. 143