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Astronomy | Astrophysics
Why are satellite TV dishes in the Northern Hemisphere pointed South and in the Southern Hemisphere pointed North?
Astronomy | Astrophysics
A source of light P placed at a distance x in front of a plane mirror of width D hangs vertically on a wall. A man walks in front of the mirror at a distance 2x from it. What is the greatest distance over which he can see the image of P in the mirror?
Astronomy | Astrophysics
the speed of a certain water wave is 12 m/sec and it’s wavelength is 3 meters. What is it’s frequency?
Astronomy | Astrophysics
Calculate the escape velocity from a red giant's atmosphere. Assume that the stars mass is 1 M and its radius is 100 R. How does this compare with the speed at which a planetary nebula shell is ejected?
I already calculate the escape velocity and got 1.34 x 10^-12 I dont know how to go about the second portion of this question.
Thanks for taking the time to help me!
I already calculate the escape velocity and got 1.34 x 10^-12 I dont know how to go about the second portion of this question.
Thanks for taking the time to help me!
Astronomy | Astrophysics
The apparent magnitude of star at distance of 100 parsec is 7. what is its absolute magnitude?
Astronomy | Astrophysics
A force acts upon a satellite in a circular path around the earth.How much work is done by the force of the satellite?
Astronomy | Astrophysics
if the mass of moon were twice of its present value , but the orbit would have been same,then would its period of revolution around the earth have been changed?
Astronomy | Astrophysics
the period of rotation of mercury is 59 earth days. how many earth hours will this be?
Astronomy | Astrophysics
Briefly describe the long-term (i.e., tens to hundreds of thousands of years) consequences
of the combined precession of the Earth’s axis, the change in the Earth’s obliquity, and the change
in the eccentricity of the Earth’s orbit about the Sun.
of the combined precession of the Earth’s axis, the change in the Earth’s obliquity, and the change
in the eccentricity of the Earth’s orbit about the Sun.
Astronomy | Astrophysics
This year (2012), a newly discovered comet passes perihelion. The elements of its orbit
on the in-bound trajectory were: a = 275 AU, e = 0.998, and i = 89°.
A) What year did this comet last pass perihelion?
B) What famous structure was completed within a few years of the comet’s previous
perihelion passage?
C) How close did the comet get to the Sun?
on the in-bound trajectory were: a = 275 AU, e = 0.998, and i = 89°.
A) What year did this comet last pass perihelion?
B) What famous structure was completed within a few years of the comet’s previous
perihelion passage?
C) How close did the comet get to the Sun?
