A current-carrying wire is bent into a circular loop of radius R and lies in an xy plane. A uniform external magnetic field B in the z direction exists throughout the plane of the loop. The current has the magnitude of II and it is deirected counterclockwise when observing from positive z axis. What is the magnetic force exerted by the external field on the loop? Express your answer in terms of some or all of the variables I, R, and B.

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?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?