A straight glass rod appears to bend when placed in a beaker of water. What is the best explanation for this phenomenon?

A. Light travels slower in water than in air.

B. Light is diffracted as it crosses the air-water interface.

C. The water is cooler than the air.

D. Light is reflected at the air-water interface.

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?