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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Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.4 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 6.8 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is required to raise the temperature of 1.90 kg of this substance from -4°C to 106°C at a pressure of one atmosphere?
A. 260 kJ B. 190 kJ C. 230 kJ D. 92 kJ E. 320 kJ
What of the following most directly determines how much fuel a star has?
A. its density B. its temperature C. its speed of rotation D. its luminosity E. its mass
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.
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