which two ratios represent quantites that are proportioanl 45/18 and 35/14 or 3/4 and 5/12 or 32/20/ and 22/10 or 7/5 and 14/9

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

What causes the development of most clouds and precipitation in the atmosphere?

If frequency goes up, what happens to wavelength? does it get shorter or longer?