The anchor of the U. S.S. Constitution (Old Ironsides) was forged in the 1790s and weighs 5300 pounds. The depth in the harbor where it sits at the Boston Navy Yard averages 40 feet.
(a) How much work is required to raise the anchor from the bottom of the harbor to a point 16 feet above the water, if you neglect the weight of the chain?
(b) If the chain actually weighs 50 pounds per foot, how much work does this add to the task? (Assume the chain also ends up 16 feet above the water.)

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?