please help

1. A 2kg ball travels in a circular path with 10N unbalanced force acting on It. If the radius of the path is doubled, but the speed remains the same, what force must be acting on the ball? 2. A student swings a 0.5 kg mass in a circular horizontal path around their head. If the radius of the rope is 0.6m and the period (time) is 0.2 seconds, what is the force of tension in the rope? 3. A 1000 kg car travels through a roundabout on an icy winter day. The roundabout has a radius of 10 m. Because of the ice, the maximum friction force from the road is 2800 N. What is the fastest the car can travel without sliding? Draw an FBD for the car in the position that is shown in the diagram, ignoring any forces that go into or out of the plane of the paper. The car is traveling counterclockwise as viewed from above