Hydrocarbons containing all single bonds and a ring in their structural formulas are
a. alkenes.
b. cycloalkanes.
c. alkynes.
d. alkanes.
e. ketones.
b
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A cylindrical tank is assembled by welding steel sections in a heli-cal pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The longitudinal strain in the the wall of the tank is approximately:
(A) 1.2 3 1024
(B) 2.4 3 1024
(C) 3.1 3 1024
(D) 4.3 3 1024
The specific heat Cv at constant volume of a monatomic gas at low pressure is proportional to T n where the exponent n is:
A. ?1 B. 0 C. 1 D. 1/2 E. 2
What is the surface of a heat exchanger?
What will be an ideal response?
A white dwarf is
A) what most stars become when they die. B) a precursor to a black hole. C) an early stage of a neutron star. D) a brown dwarf that has exhausted its fuel for nuclear fusion.