The impressionist painter georges seurat used a tech- nique called pointillism, in which his paintings are composed of small, closely spaced dots of pure color, each about 2.0 mm in di- ameter. the illusion of the colors blending together smoothly is pro- duced in the eyes of the viewer by diffraction effects. calculate the minimum viewing distance for this effect to work properly. use the wavelength of visible light that requires the greatest distance be- tween dots, so that you are sure the effect will work for all visible wavelengths. assume the pupil of the eye has a diameter of 3.0 mm.

Ais not a compound machine. a. bolt b. shovel c. handcart (dolly) d. see-saw (teeter totter)

What are the factors that affect the resistance of a wire?

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants