Magnitude of u = 15, direction angle θ = 35° magnitude of v = 18, direction angle θ = 60° find the magnitude and direction angle for u + v. round the magnitude to the nearest tenth and the direction angle to the nearest whole degree.

Which of the following correctly describes the early view of catastrophism?

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

Select the correct answer. what does the process of natural selection involve?