A collapsing cloud fragment that will form a star of one solar mass (like our Sun) has a mass of about:
A) 2 solar masses.
B) 10 solar masses.
C) 200 solar masses.
D) 1020 solar masses.
E) 1040 solar masses.
A
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Higher mass protostars enter the main sequence:
A) faster and at a higher luminosity and temperature. B) faster and at a lower luminosity and temperature. C) slower and at a higher luminosity and temperature. D) slower and at a lower luminosity and temperature. E) at the same rate, but at a higher luminosity and temperature.
Approximately how many times does an average human heart beat in a lifetime?
A) 3 × 1011 B) 3 × 1010 C) 3 × 109 D) 3 × 108 E) 4 × 107
How many molecules are in (a) 1.0 cm3 of air at STP and (b) 1.0 cm3 of helium at STP? (R = 8.31 J/mol ? K, NA = 6.022 × 1023 molecules/mol)
What will be an ideal response?
What kind of telescopes are refracting, reflecting, and catadiaoptic telescopes?
What will be an ideal response?