A 30 N net force on a skater produces an acceleration of 0.6 m/s2 . What is the mass of the skater?

Phase changes are chemical changes. true or false

When an object is heated it contracts. a. true b. false

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?