Two identical metal bars are heated up until they are both glowing. One of them is "red hot" and the other is "blue hot." Which one is hotter, the one that glows red or the one that glows blue?
A) the red one
B) the blue one
C) We cannot tell without knowing more about the two bars.
B
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Which of the following is an example of re?ection or scattering?
A) Red light hits a red sweatshirt. B) Visible light does not pass through a black wall. C) Light comes from your computer screen. D) Blue light hits a red sweatshirt.
A steel pipe (d3 5 104 mm, d2 5 96 mm) has a plastic liner with inner diameter d1 5 82 mm. The modulus of elasticity of the steel is 75 times that of the modulus of the plastic. Allowable stresses in steel and plastic are 40 MPa and 550 kPa, respectively. The allowable bending moment for the composite pipe is approximately:
(A) 1100 N?m
(B) 1230 N?m
(C) 1370 N?m
(D) 1460 N?m
On the surface of a sphere the shortest distance between two points is
A) an arc on a great circle. B) a straight line. C) a circle. D) a triangle. E) a curvy line.
Transformers: In an ideal transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?
A. 458 B. 240 C. 110 D. 22