A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
(C) 0.85
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Compared with the spectral lines in the solar spectrum, lines in a supergiant spectrum are
a. sharper. b. broader. c. weaker. d. stronger. e. broader and weaker.
The lowest places on Earth's surface are called ______________ trenches
Fill in the blank(s) with correct word
An incandescent light (glowing tungsten filament) produces:
A) a continuous spectrum, with the peak giving the temperature of the filament. B) an emission spectrum, with bright lines due to ionized tungsten. C) an absorption spectrum, with dark lines due to the solid filament. D) a continuum, with bright tungsten lines added. E) a continuum, with dark lines of tungsten and argon as well.
A Nichrome wire has a radius of 0.50 mm and a resistivity of 1.5 × 10^-6 W×m. If the wire carries a current of 1.0 A, what is the potential difference per unit length along this wire?
a. 1.9 V/m c. 1.6 V/m b. 0.95 V/m d. 0.003 V/m