Why would an observer out in space see the moon orbiting the earth rather than the earth orbiting the moon? A. The earth's gravity pulls on the moon, rather than the moon's gravity pulling on the earth.

B. The same side of the moon always faces the earth.

C. The moon has much less mass than the earth.

D. The same force that pulls an apple to earth pulls the moon toward the earth.

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?