Scientific ideas about the solar system have changed over time. Which of them following statements best compares older models of the solar system with the
currently accepted model?
A. In older models, Earth's distance from the sun changed, while in the current
model, Earth's distance from the sun is constant.
B. Older models showed planets moving in circular orbits, while in the current
model, planets move in elliptical orbits.
C. In older models, Venus was closest to the sun, while in the current model,
Mercury is closest to the sun.
D. Older models included ten planets, while the current model includes
eight planets

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina.with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)

What is the relationship between ozone and smog?