Aman stands at the center of a platform that rotates without friction with an angular speed of 3.95 rev/s. his arms are outstretched, and he holds a heavy weight in each hand. the moment of inertia of the man, the extended weights, and the platform is 12.5 kg*m^2. when the man pulls the weights inward toward his body, the moment of inertia decreases to 2.5 kg*m^2. what is the resulting angular speed of the platform?

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

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

Which planet do you think would be easiest for humans to colonize some day?