An ostrich lays the largest bird egg. A typical diameter for an ostrich egg so its widest part is 12 cm. Suppose an egg of this size rolls down a slope
so that the centripetal acceleration of the shell at its widest part is 0.28
m/s. What is the tangential speed of that part of the shell?

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?