Q1. Assume you are 75 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 4.3 mm?
Q2. A child bounces a 59 g superball on the sidewalk. The velocity change of the superball is from 21 m/s downward to 18 m/s upward. If the contact time with the sidewalk is 1800s, what is the magnitude of an average force exerted on the superball by the sidewalk?
Give answer in units of N.