El satélite que orbita alrededor de la Tierra se halla sometido a una fuerza centrípeta, que es la fuerza de atracción gravitatoria. Es decir, la fuerza que mantiene en órbita al satélite ligado a la Tierra es la fuerza gravitatoria. Para que exista una fuerza según los postulados de Newton debe existir una aceleración en el cuerpo, si sabemos que el periodo de la Luna alrededor de la tierra es de 29,53 días, el período de la órbita de la Tierra es 2,9X107s y el radio de su órbita es 1,5x1011m. Si el período de Neptuno es 5,2X109s, ¿cuál es el radio promedio de su órbita? Asumiendo que son trayectorias circulares (25%) Gracias por adelantado

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.

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."