Suppose you drop your pencil on the floor while working at a desk on your problem set. roughly estimate the change in entropy of the universe well after the pencil comes to rest. note: an approximate, order-of-magnitude numerical estimate is what we are looking for here. but briefly specify and justify any major approximations or assumptions you make.

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?