Which of the following is the most similar, in its operation, to a photovoltaic cell?
A) fluorescent light bulb
B) geothermal energy
C) fossil-fuel electric power plant
D) battery
E) automobile engine
D
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What is diffusional velocity?
What will be an ideal response?
First Law of Thermodynamics: During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the work done by the gas in the process?
A. 0 J B. 5.0 J C. -5.0 J D. -10 J
A colloid is a ______________ mixture.
Fill in the blank(s) with the appropriate word(s).
A composite beam is made up of a 90 mm 3 160 mm wood beam (Ew 5 11 GPa) and a steel bottom cover plate (90 mm 3 8 mm, Es 5 190 GPa). Allowable stresses in wood and steel are 6.5 MPa and 110 MPa, respectively. The allowable bending moment about the z axis of the composite beam is most nearly:
(A) 2.9 kN?m
(B) 3.5 kN?m
(C) 4.3 kN?m
(D) 9.9 kN?m