3. A toy car of mass 1.2 kg is driving vertical circles inside a hollow cylinder of radius 2.0m. It is moving at a constant speed of 6 m/s. a) Calculate the magnitude of the normal force acting on the car when it is on the top of the circle and when it is on the bottom of the circle, respectively. b) What is the minimum speed the car needs to go around the circle without falling off? 4. A tetherball of mass M=1.0kg is hanging from a string of length L=1.0m. The ball is moving in a horizontal circle so that the string makes an angle 0=120 with the vertical. Calculate the tension in the string and the speed of the ball. L M 5. A curve of radius R= 100m is banked at an angle 0= 150. Derive a symbolic answer and calculate a numerical value for the speed at which the car can take this curve without friction