Suppose you walk to your friend’s house in 15 min, then to the store which takes 45 min, and then to school which takes 25 min. If the distances are A = 435 m, B = 960 m, and C = 685 m what was the magnitude of your average velocity in kilometers per hour?

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?

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?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.