A disc, a sphere and a ring with the same mass and the same radius roll down an inclined plane. A block also slides on an frictionless inclined plane of the same height. All objects start from the same height at rest. Rank the objects in terms of velocity of the center of mass at the bottom of the plane.

Plss anybody know how to do this? ? i need the answers from a through d

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.