Express (4.3 × 106)-1/2 in scientific notation
A) 2.1 × 103 B) 2.1 × 104 C) 2.1 × 10-5 D) 4.8 × 10-4
D
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In the field, you find an unidentified mineral that is clear, exhibits conchoidal fracture, and can scratch glass. This mineral is most likely:
-gypsum. -calcite. -quartz. -hornblende. -muscovite.
Why are Cepheid variables important?
A) Cepheid variables are stars that vary in brightness because they harbor a black hole. Therefore, they provide direct evidence for black holes. B) Cepheids variables are supermassive stars that are on the verge of becoming supernovae. Therefore they allow us to choose candidates to watch if we hope to observe a supernova. C) Cepheids variables are a type of irregular galaxy, much more common in the early universe. Therefore they help to understand how galaxies formed. D) Cepheids variables are pulsating stars whose pulsation periods are directly related to their true luminosities. Therefore they can be used as distance indicators.
State the periodic law of chemistry that is used to set up the periodic table
Select all of the following descriptions that match what happens when a ferromagnetic material is placed in an external magnetic field.
a. The ferromagnetic material rapidly cools. b. The ferromagnetic material becomes negatively charged. c. The ferromagnetic material becomes positively charged. d. The external magnetic field induces magnetic poles in the ferromagnetic material. e. The ferromagnetic material becomes magnetized. f. Nothing, ferromagnetic materials do not interact with magnetic fields.