Once a star ejects a planetary nebula, it becomes a white dwarf
Indicate whether the statement is true or false
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How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring the masses and spectral types of main-sequence stars in binary systems B) by using computer models of hydrogen fusion and stellar structure C) by measuring stellar radii with powerful telescopes D) by comparing stars with the same spectral type but different luminosities
A step-up transformer doubles a primary voltage 110 V (ac). What is the ratio of the number of turns in its primary coil to those in the secondary coil?
A) 1:4 B) 4:1 C) 2:1 D) 1:2 E) 1:8
A simple electrical circuit has a constant voltage power supply and a variable resistor as a circuit. As you increase the resistance the current flow _______________
Fill in the blank(s) with correct word
Neptune has a radius of 2.48 ×107 m and an escape velocity of 23,300 m/s. What is the mass of Neptune? G = 6.67 x 10-11 N•m2/kg2
A) 1.01 × 1026 kg B) 2.02 × 1026 kg C) 3.03 × 1026 kg D) 4.04 × 1026 kg E) 5.05 × 1026 kg