Prečo je omnoho ľahšie udržať sa na hladine vody v mori ako v rieke

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k