Treat each of your eyes as a circular aperture of diameter 3.5 mm. Light of wavelength 500 nm is used to view two point sources that are 894 m distant from you
How far apart must these two point sources be if they are to be just resolved by your eye? Assume that the resolution is diffraction limited and use Rayleigh's criterion.
What will be an ideal response?
Answer: 16 cm
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A comet that has an orbit around the Sun inclined to the ecliptic plane by 65° probably originated in the Kuiper belt
Indicate whether the statement is true or false
Which kind of object is the best standard candle for measuring distances to extremely distant galaxies?
A. a white dwarf. B. a Cepheid variable star. C. a white dwarf supernova.
An object is thrown vertically upward such that it has a speed of 25 m/s when it reaches two thirds of its maximum height above the launch point. Determine this maximum height
a. 64 m b. 48 m c. 32 m d. 96 m e. 75 m
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