Based on the given right ascensions and declinations, which of the following stars lies closest to the south celestial pole on the celestial sphere?
A) Sirius: RA = 6hr 45m, dec = -16°42'
B) Canopus: RA = 6hr 24m, dec = -52°41'
C) Alpha Centauri: RA = 14hr 40m, dec = -60°50'
D) Arcturus: RA = 14hr 16m, dec = +19°11'
E) Vega: RA = 18hr 37m, dec = +38°47'
C) Alpha Centauri: RA = 14hr 40m, dec = -60°50'
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Suppose there are 2 moles of a gas in a container of fixed size and the average spacing of molecules in the container is 4.0 nm. If an additional 14 moles of the gas are added to the container and thermal equilibrium is established, what is the new average spacing of the molecules?
a. 2.0 nm c. 1.4 nm b. 0.50 nm d. 2.8 nm
Some people may be genetically predisposed to seek out difficult relationships. These difficult relationships may contribute to their experience of depression. This is an example of the _________ model.
Fill in the blank(s) with the appropriate word(s).
When can Sirius, a favorite star of the Northern Hemisphere, be observed?
a. during summer b. during spring c. all year long d. during winter e. during fall
The period of a satellite circling planet Nutron is observed to be 84 s when it is in a circular orbit with a radius of 8.0 × 10^6 m. What is the mass of planet Nutron?
a. 6.2 × 10^28 kg b. 5.0 × 10^28 kg c. 5.5 × 10^28 kg d. 4.3 × 10^28 kg e. 3.7 × 10^28 kg