Which type of nebula is produced when a star, hotter than 25,000 K, excites the gas near it to produce an emission spectrum producing a distinctive pink color?
a. emission nebulae
b. H I
c. reflection nebulae
d. dark nebulae
e. spectral type B6
a
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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'
When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the
A) ball. B) floor. C) need more information
A 2-kg ball is moving with a constant speed of 5 m/s in a horizontal circle whose radius is 50 cm. What is the acceleration of the ball?
A) 0 m/s2 B) 10 m/s2 C) 20 m/s2 D) 50 m/s2 E) 500 m/s2
The person who first explained the photoelectric effect was __________
Fill in the blank(s) with correct word