Three of your friends are all sitting g on one end of a seesaw. the combined weight is 275 n. the length from the fulcrum to your friends is 2.5 m. the rest of the seesaw (from the fulcrum to you) is 4.5 m. what is the ma? what effort force is needed to lift your friends?

Which of the following would not be taken into consideration when describing the quality of a sound

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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.