An polyethylene bar (E 5 1.4 GPa, v 5 0.4) of diameter 80 mm is inserted in a steel tube of inside diameter 80.2 mm and then compressed by axial force P. The gap between steel tube and polyethylene bar will close when compressive load P is approximately:
(A) 18 kN
(B) 25 kN
(C) 44 kN
(D) 60 kN
(C) 44 kN
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The mass density of normal air is, at a particular temperature, 
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a. 
b. 
c. 
d. 
e. 
f. 
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