From a fracture mechanics viewpoint, small-diameter brittle filaments have a higher strength than bulk material does, because the smaller-diameter material has a smaller _________.
Fill in the blank(s) with the appropriate word(s).
crack or defect
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A 40.0-kg box is being pushed along a horizontal, smooth surface. The pushing force is 15.0 N directed at an angle of 15.0° below the horizontal. What is the acceleration of the crate?
A) 0.158 m/s2 B) 0.362 m/s2 C) 0.466 m/s2 D) 0.375 m/s2 E) 0.684 m/s2
An empirical interatomic pair potential for xenon atoms, in units of eV, and nm, has been determined to be
The lattice parameter of FCC xenon is equal to 0.630 nm.
(a) Determine the equilibrium pair bonding energy.
(b) Determine the cohesive energy of a xenon crystal at 0 kelvin using only the nearestneighbor interactions, and compare your result with the value in the periodic table.
Comment on any observed difference.
What did ancient civilizations achieve in astronomy?
a. predicting eclipses b. time keeping c. monitoring lunar cycles d. predicting seasons of agriculture e. all of the above
Capacitances of 10. ?F and 20. ?F are connected in parallel, and this pair is then connected in series with a 30. ?F capacitor. What is the equivalent capacitance of this arrangement?
What will be an ideal response?