In 1991 four english teenagers built an eletric car that could attain a speed of 30.0m/s. suppose it takes 8.0s for this car to accelerate from 18.0m/s to 30.0m/s. what is the magnitude of the car's acceleration?

Which transition by an electron will release the greatest amount of energy? oa ob oc od

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

The radius of an atom is closest in size to a