Which of the following stars is a luminous red supergiant and is classified M2 Ia?
A) Spica
B) Betelgeuse
C) Pollux
D) Miaplacidus
B
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A fastener bolt for the airframe of a glider has a cross-sectional area of 1.0 square cm and a length of 4.0 cm. The part must be able withstand a tensile force of 1.0 × 104 N, and as a factor of safety this tensile force can produce a stress of no more than 50 percent of the tensile yield stress in the bolt. For damage tolerance the bolt must have at least 10 percent strain to fracture. Because weight is critical for this glider design the maximum weight possible for this bolt is 8.0 g. The bolt is not subject to high or low temperatures. Of the materials covered in this chapter what would be the best material to select? Because this is an aircraft part it not necessary to choose the cheapest material, but excessive cost should be avoided.
What will be an ideal response?
The energy gap between the valence and conduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substance?
A) 599 nm B) 639 nm C) 959 nm D) 873 nm E) 995 nm
What is the Hubble constant essentially a measure of?
a. the number of galaxies in the universe b. the expansion of the universe c. the age of the Milky Way galaxy d. the amount of dark matter in an average galaxy
The major division of chemistry that deals with what substances are present and in what quantities is called ______________chemistry
Fill in the blank(s) with correct word