For a rod in tension, what material class provides the highest specific critical-stress intensity factor?
(a) Steels
(b) Titanium alloys
(c) Aluminum alloys
(d) Uni-ply composites (GFRP, CFRP, and KFRP)
(d) Uni-ply composites (GFRP, CFRP, and KFRP)
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When an astronaut experiences weightlessness in space, their mass is
A. zero. B. becoming lesser and lesser as s/he is going higher. C. the same as on Earth. D. double than on Earth.
The focal lengths of the objective and the eyepiece of a microscope are 0.5 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm. The near-point distance of the person using the microscope is 25.0 cm
If the microscope is focused on a small object, what is its final magnification? A) -44 B) -66 C) -77 D) -88 E) -100
In the context of the double-slit experiment, quantum uncertainty refers to
A) the fact that the particles of matter or radiation are instantaneously replaced by a spread-out matter field or EM field when the particles impact the screen. B) the fact that the electron beam or light beam goes through both slits rather than only one. C) our inability to precisely predict the point at which a spread-out matter field or EM field will interact with the screen. D) the fact that the entire matter field or EM field instantaneously collapses to the single interaction point when the field interacts with the screen. E) the fact that each interaction with the screen occurs over a broad area of the screen.
Which of these statements about the poles of magnets is correct?
a. Like poles repel; unlike poles attract. b. Like poles attract; unlike poles repel. c. Unlike poles attract; like poles have no effect. d. All poles repel. e. All poles attract.