You are working out on a rowing machine. each time you pull the rowing bar (which simulates the "oars") toward you, it moves a distance of 1.0 m in a time of 1.7 s. the readout on the display indicates that the average power you are producing is 82 w. what is the magnitude of the force that you exert on the handle?

The center of a long frictionless rod is pivoted at the origin, and the rod is forced to rotate in a vertical plane with constant angular velocity \omega. write down the lagrangian for a bead of mass m threaded on the rod, using r as your generalized coordinate, where r, \phi are the polar coordinates of the bead. (notice that \phi is not an independent variable since it is fixed by the rotation of the rod tobe \phi = \omega * t) solve lagrange's equation for r(t). what happens if the bead is initially at rest at the origin? if it is released from any point ro > 0, show that r(t) eventually grows exponentially. explain your results in terms of the centrifugal force m* \omega ^2 *r.