When the Sun is on the horizon, it is actually lower than it appears because of
a. refraction.
b. dispersion.
c. scattering.
d. reflection.
a
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You want to produce a casting of sterling silver that is silver plus 13 atomic % copper. Pure silver is too soft for many applications, and adding 13 atomic % copper strengthens the silver without significantly changing the color. To produce the sterling silver casting, you are going to melt commercially pure silver and copper in a furnace, and then you will pour the liquid metal mixture into a mold. The following questions relate to this alloy.
(a) In selecting a furnace, what must be the minimum value of the high-temperature capability of your selected furnace?
(b) In transferring the liquid metal from the furnace to the mold, what is the minimum temperature that the metal can reach so that none of the metal has solidified?
(c) After the casting has cooled to room temperature, what phases are present, what is the equilibrium chemical composition (Ci) of each phase present, and what is the atom fraction (fi) of each phase present?
Refracting Telescope: The focal length of the objective lens of a telescope is 75.0 cm, and the eyepiece has a focal length of 6.00 cm. What is the magnification of this telescope?
A. 0.0800 B. 0.645 C. 450 D. 12.5 E. 200
Two microcuries is
a. 200,000 Ci. b. 0.0002 Ci. c. 0.00002 Ci. d. 0.000002 Ci. e. 0.00000002 Ci.
According to the law of reflection, the incident ray, reflected ray, and normal between them
A) lie in the same plane. B) may or may not lie in the same plane. C) lie in planes that are perpendicular to one another.