Study this map of the world.

world map showing the continents and divided into western and eastern hemispheres. western hemisphere includes the following plates: north american, pacific, south american, african, eurasion. eastern hemisphere includes the following plates: eurasion, pacific, african, indo-australian.

which plate is found in both the western and eastern hemispheres?

pacific
south american
north american
indo-australian

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.