I need tips! Please help me figure these out!

17. A fun ride at the fair is the roundup. In this ride, you stand against a wall and the cylinder shaped ride spins. The cylinder then tilts and you "stick" to the inside part of the wall as shown below. If the radius of the ride is 5 m and you feel twice as heavy as normal when on the ride, (ac = 19.6 m/s2), what is your tangential velocity? 18. In the diagram below, a person swings a rock at the end of a string. The mass of the rock is 0.5 kg and the radius of rotation is 1.5 m. If the velocity of rotation is 7.5 m/s, what is the tension in the string? Label Fo, ac, and vt vectors to the picture. 19. When the cup of water on the platform was swung in a circle, what force is the centripetal force