An office door is given a sharp push and swings open against a pneumatic device that slows the door down and then reverses its motion.

(a) At the moment the door is open the widest, does the doorknob have a centripetal acceleration?

-Yes
-No

(b) At the moment the door is open the widest, does it have a tangential acceleration?

-Yes
-No

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

Could someone me find the answer to this problem.

Which levels of government establish and implement educational requirements for minors