Exoplanets having masses between 2 and 10 Earth masses are called ________
Fill in the blank(s) with correct word
super-Earths
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When a Hooke's law spring is stretched a distance 3x, how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x
a. It is 3 times as much. c. It is 4 times as much. b. It is 8 times as much. d. It is 9 times as much.
The mass of 1H is 1.007825 u and the mass of 1n is 1.008665 u. The mass of 12C is 12.000000 u, of 13N is 13.005739 u, and of 14N is 14.003074 u. What is the binding energy of the last neutron in 14N?
A) 10.6 MeV B) 9.8 MeV C) 1.9 MeV D) 2.5 MeV E) 3.8 MeV
A helium-filled balloon has a volume of 1 m3 . As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are ?40°C and 0.1 atm?
a. 4 b. 6 c. 8 d. 10 e. 1.5
For establishing an experimental station that carries out mineral prospecting on the Moon and also houses periodic human visits for space-based explorations, a cooling (or thermal management) system is to be designed for the high-powered electronic systems that are needed to operate the controls. One of the most effective methods for large heat flux dissipation is to use phase change, or boiling, as the primary convection mechanism. For designing one such pressurized system, calculate the maximum heat flux attainable in nucleate boiling with saturated water at 200 kPa pressure. Note that the gravitational field on the Moon surface is 1.622 m/s2 , which is approximately a little less than one- sixth that on Earth.
GIVEN
FIND
? The maximum heat flux (q"max)
ASSUMPTIONS
? Steady state conditions
? Nucleate pool boiling
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water at 200 kPa
From Table 9.2, the surface tension (o) = 0.0547 N/m