To increase the room-temperature yield strength of a metal containing dislocations, it is necessary to introduce _________to dislocation motion.
Fill in the blank(s) with the appropriate word(s).
obstacles
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Equilibrium: A 10-kg sign is held by two ropes as shown in the figure. What is the tension on rope A?
A. 44 N B. 69 N C. 72 N D. 88 N E. 98 N
When we speak of the large-scale structure of the universe, we mean
A) the overall arrangement of galaxies, clusters of galaxies, and superclusters in the universe. B) the structure of any large galaxy. C) the structure of any individual cluster of galaxies. D) the overall shape of the observable universe.
A heat pipe having an effective length of 80 cm uses methanol as the working fluid. At an operating temperature of 20ºC the methanol flow rate is 12 mg/s, and the heat pipe uses an axially grooved wick arrangement with 60 equally spaced 2.1-mm-deep grooves. Determine the width of the grooves.
What will be an ideal response?
Select the correct equations that show that a freely falling rock drops a distance of 80 m when it falls from rest for 4 s .