A 50 kg person stands at the outer edge of a merry-go-round, which can be approximated as a uniform horizontal cylinder with mass 30 kg and radius 2 m. The merry-go-round and person initially rotate together at a rate of 1 rotation per second about a frictionless axle through the center. How fast must the person begin walking around the outer edge in order to bring the merry-go-round to rest

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

If we relied solely on the nonrenewable resources found in the u. s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal

The ozone hole appears in antarctica during