If rod cd is rotating with an angular velocity cd = 4 rad/s, determine the angular velocities of rods ab and bc at the instant  = 70, bc is horizontal, and cd is vertical. [you are advised to use instantaneous center (ic) of zero velocity approach for link bc]

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.