Why are doorknobs placed at the edge of a door rather than in the center

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

One number is said to be an "order of magnitude" larger than another number if choose one: a. it is 10 times larger. b. it is 5 times larger. c. it is 3 times larger. d. it is 100 times larger. e. it is 2 times larger.

If a star is moving toward earth, it is