PLEASE HELP: 11: How fast would you need to travel a) to escape the gravitational pull of the sun? b) As the sun begins to die, it wil become a red giant. This means that its mass will remain the same but its diameter will increase substantially. When the sun becomes a red giant will its escape speed be greater than, less than, or the same as, it is now?

12: How fast would the moon need to travel in order to escape the gravitational pull of the Earth, if Earth has a mass of 5.98 X 10^24 kg and the distance from Earth to the moon is 3.84 X10^8 m?

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