A main sequence star has 3 times the mass of the Sun. Using ________ we find that the star is ________ times more luminous than the Sun.
A. the Stefan-Boltzmann law; 3
B. the inverse-square law; 9
C. the mass-luminosity relation; 3
D. Wien's law; 3
E. the mass-luminosity relation; 9
Answer: E
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If the density of the universe is at the critical density, this means that:
A) the universe is expanding at a rate equal to the escape speed of the universe. B) the universe is expanding at a rate less than the escape speed of the universe. C) the universe is expanding at a rate greater than the escape speed of the universe. D) the universe is expanding at a rate equal to the speed of light. E) the universe is expanding at a rate greater than the speed of light.
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A. 260 kJ B. 190 kJ C. 230 kJ D. 92 kJ E. 320 kJ
The density of a 57-kg (126-lb) person who can float in salt water but not in fresh water is about
1) 505 kg/m3 (32 lb/ft3) 2) 1010 kg/m3 (63 lb/ft3) 3) 2020 kg/m3 (126 lb/ft3) 4) 4040 kg/m3 (252 lb/ft3) and has a volume of about 5) 1 ft3. 6) 2 ft3. 7) 3 ft3. 8) 4 ft3. 9) need more information