You are pushing a 20-kg box along a horizontal floor. friction acts on the box. when you apply a horizontal force of magnitude 48 n, the box moves at a constant velocity. if you increase your horizontal pushing force to 100 n, what is the acceleration of the box?

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?