Heat is transferred through solids primarily by the process of
a) convection.
b) conduction.
c) condensation.
d) radiation.
b
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______________is an alloy of copper and tin.
Fill in the blank(s) with the appropriate word(s).
A composite beam is made up of a 200 mm 3 300 mm core (Ec 5 14 GPa) and an exterior cover sheet (300 mm 3 12 mm, Ee 5 100 GPa) on each side. Allowable stresses in core and exterior sheets are 9.5 MPa and 140 MPa, respectively. The ratio of the maximum permissible bending moment about the z axis to that about the y axis is most nearly:
(A) 0.5
(B) 0.7
(C) 1.2
(D) 1.5
Which of the following statements is true of green grass?
A) It absorbs red light and emits green light. B) It absorbs red light and reflects green light. C) It transmits all colors of light except green. D) It means the lawn is healthy.
The strong forces of attraction that exist between water molecules and are responsible for many of its unique properties as a solvent are called
A) dispersion forces B) ionic bonds C) hydrogen bonds D) covalent bonds