OPEN RESPONSE QUESTIONS Q1. Torque and rotational kinematics: You are applying a 240N force to open a stuck door. You are applying the force at a 0.75m distance from the pivot at a 20 angle as shown below. (20 points) To Jouborg sill al trying IF 240 N Shug afte horse Top view of door - - r = 0.75 m Radial line An arrow fashions Hinge i . Find the torque produced by you, while you are trying to open the door. ii. To maximize the torque, you decided to apply the same force to the edge of the door (1m from the hinge) but now perpendicular to the radial line. Find the new torque acting on the door. iii. If the moment of inertia of the door is I = 55 kg.m, using the maximum torque you found in part b, find the angular acceleration. iv . Assuming you maintained the angular acceleration you obtained in part c constantly throughout the motion, if the door starts moving from rest, find the angular displacement(0) of the door after 0.5s. Q2) Static Equilibrium: kids are playing on a seesaw. They are in a static equilibrium in perfect balance. (20 points) m1 m2 W 1 1 . The boy has a mass of 25 kg. If r, is 3m and r2 is 2.5m from the pivot point, find the mass of the girl. ii Find the torque produced by the girl. iii. The boy's brother who is 30 kg, joins him on the left side of the seesaw. How far should the girl move now to balance the new torque (Find the new r2) iv . If the mass of the seesaw plank is 90 kg, find the net normal force Fo at the pivot when all three kids are playing on the seesaw