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3a) When a linear force is applied to the handle of a wrench, a torque is created. The length of the wrench (r) is 0.25m. A torque of 15 Nm is applied by the wrench. Calculate the force applied in a direction perpendicular to the handle of a wrench and at the end of the handle. [2 marks] wo- Figure 1 3b) Figure 1 shows a uniform disk resting on its circumferential edge on a frictionless surface. A spring is affixed to the centre of rotation of the disk such that the spring will extend as the disk rolls. The disk has a mass of 18.00kg and a radius of 0.24m, and the spring has a spring constant of 2000N/m. A torque of 90 Nm is applied to the disk. The spring is initially unstretched and the disk rolls without slipping on the horizontal surface. Therefore only the spring force and couple moment M do work. Find the net work done on the disk after it has travelled a linear distance of 0.15m. [5 marks] (ii) By finding the translational and rotational kinetic energies of the disk, and using kinematic relation, find the disk's angular velocity at a linear distance of 0.15m. [6 marks) 3c) A 50kg uniform wheel is subjected to a force of 50N applied at an angle of 300 above the horizontal. The radius of the wheel is 0.3m. The wheel starts from rest and rolls without slipping. Once the wheel has completed 10 revolutions, find © The work done on the wheel by the force [3 marks] m. The angular velocity of the wheel (by using principles of energy and work done). [4 marks]