7. A horizontal beam length= 10m, mass= 25kg that is pivoted at the wall, with its far end supported by a cable that makes an angle 50° with the horizontal. If a person with a mass of 60kg stands 3.0m from the pivot, what is the tension in the cable? I need to know all of the forces acting on the beam.
8. A disk of mass M and radius R is rolling down an incline without slipping. If the disk starts from rest find a, its linear speed V when it reaches the bottom and b, its linear acceleration a while rolling down the incline?
9. A disk of mass 20kg and radius 40cm can rotate around an axis perpendicular to the disk and passing through its center. A 20-N force acts tangentially to the disk. Find the kinetic energy of the disk 10s after the force is applied. Assume that the disk is at rest initially.
Handwritten calculations show how to work out forces acting, linear acceleration and kinetic energy.