If a crystal contains only two edge dislocations with Burger’s vectors of opposite signs, and they come together on the same slip plane the resulting number of dislocations is equal to _________.

Fill in the blank(s) with the appropriate word(s).


zero

Physics & Space Science

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When subsurface ground material is completely saturated with water, we call it

A) the water table. B) groundwater. C) the saturated zone. D) the unsaturated zone.

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A plane truss with span length L 5 4.5 m is constructed using cast iron pipes (E 5 170 GPa) with a cross-sectional area of 4500 mm2. The displacement of joint B cannot exceed 2.7 mm. The maximum value of loads P is approximately:

(A) 340 kN
(B) 460 kN
(C) 510 kN
(D) 600 kN

Physics & Space Science

Vision Problems: A nearsighted person has a far point of 18 cm. What power contact lenses will allow this person to comfortably see distant objects clearly?

A. +5.6 diopters B. -5.6 diopters C. +0.056 diopters D. -0.056 diopters

Physics & Space Science

What is the relationship between the image distance and the object distance for a plane (flat) mirror?

A. They are not related B. The image distance is double the object distance C. The image distance is half the object distance D. They are the same.

Physics & Space Science