Which of the following materials is most appropriate for a design requiring a material with a permanent high intensity of magnetization?
(a) Fe-3 wt. % Si
(b) MnO
(c) Alnico-5
(d) Fe3O4
(c) Alnico-5
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The logarithm of the ratio of the initial cross-sectional area to the area at the location of fracture of a specimen is equal to the _____________ to fracture.
Fill in the blank(s) with the appropriate word(s).
Energy Density: A 4.4 × 1014 Hz laser emits a 2.1 ?s pulse that is 5.0 mm in diameter. The energy density in the beam is 0.24 J/m3. How many wavelengths are there in the length of the beam? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A. 9.2 × 108 B. 2.8 × 109 C. 2.8 × 108 D. 9.2 × 109 E. 2.8 × 1010
Which of the following has the highest frequency?
a) Ultraviolet b) Microwaves c) X-rays d) Radiowaves
Free Fall: A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s?
A. 2.1 m/s B. 4.9 m/s C. -2.1 m/s D. -4.9 m/s E. 0.00 m/s