Question

2 A student places an object with a mass of mon a disk at a position r from the center of the disk. The student starts rotating the disk. When the disk reaches a speed of 0.8 m/s, the object starts to slide off the disk. What is the coefficient of static friction between the object and the disk? (4 pts) let the radius be 0.1 meters and the mass will be 2.0 Kilograms 1 3. A car with mass m travels over a hill with a radius of curvature of r at a speed of 15 m/s. What is the normal force on the car when the car is at the top of the hill? (6 pts) the car has a mass of 1200 kilograms and the radius of curvature is 25 meters 4. A student with a mass of m rides a roller coaster with a loop with a radius of curvature of r. What is the minimum speed the rollercoaster can maintain and still make it all the way around the loop? (6 pts) the radius of curvature is 6.0 meters, the mass of the rider is 60 Kg

Answer 1

given data- r=o.im W m = 2xg. V = 0.8 mls. Dise Letus consider, les static friction coefficient Centrifugal force on object, muz Now, Frictional force on The fr = object = (les). mg. (les). mg - อย่าง lis V2 rg (0.8) 2 lis = 0.652 0.149,81 → les = 0.652