The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36.0 km/s. the second star, beta, has an orbital speed of 12.0km/s. the orbital period is 137 d.
(a)what is the mass of the star alpha?
(b)what is the mass of the star beta?
(c)one of the best candidates for a black hole is found in the binary system called a0620-0090. the two objects in the binary system are an orange star, v616 monocerotis, and a compact object believed to be a black hole. the orbital period of a0620-0090 is 7.75hours, the mass of v616 monocerotis is estimated to be 0.67 times the mass of the sun, and the mass of the black hole is estimated to be 3.8 times the mass of the sun. assuming that the orbits are circular, find the radius of the orbit of the orange star.
(d)find the radius of the orbit of the black hole.
(e)find the orbital speed of the orange star.
(f)find the orbital speed of the black hole.

thermal energy is the answer

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.