Which statements correctly describe theories? Check all that apply.

A theory cannot help predict what may happen in the future.
A theory is based on a single hypothesis.
A theory results from several repeated experiments.
A theory is a proven fact.
A theory explains observations and hypotheses.
A theory may be revised over time.

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. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

Consider the following position function. find (a) the velocity and the speed of the object and (b) the acceleration of the object. bold r left parenthesis t right parenthesisr(t)equals=left angle 6 t superscript 4 baseline comma 2 t cubed right angle6t4,2t3 for tgreater than or equals≥0

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot