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Question 2 The 3 kg uniform slender rod rotates about point B and has an angular velocity of 4 rad/s CW at the horizontal position shown. (16 points) a) What type of energy does the bar have when in the horizontal position? What type of energy does the bar have when it has rotated 90°? (HINT: Specify a datum first.) (2 points) b) What is the potential energy of the rod in the initial position? When it has rotated 90°? When it has rotated 180°? (6 points) c) What is the kinetic energy of the rod in the initial position? When it has rotated 90°? When it has rotated 180°? (HINT: If values are unknown, leave as variables) (4 points) d) What is the angular velocity of the rod after it has rotated 90°? 180°? (4 points) e) BONUS: Name two conservative forces. (1 point) A - 750 mm Spring unstretched length: So = 120 mm k = 400 N/m B D 150 mm C 360 mm