Space debris left from old satellites and their launchers is becoming a hazard to other satellites. (a) calculate the speed of a satellite in an orbit 900 km above earth’s surface. (b) suppose a loose rivet is in an orbit of the same radius that intersects the satellite’s orbit at an angle of 90º relative to earth. what is the velocity of the rivet relative to the satellite just before striking it?

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