17. A 400g block is pushed up a frictionless 30-degree inclined plane by a 2.2N applied force that is parallel to the plane. a. Draw a free body diagram for the block. (3pts) b. Apply Newton's 2nd Law to find the acceleration of the block. (3pts) c. What is the work done by the applied force as the block slides 25cm? (3pts) 18. A 155gram hockey puck is attached to a 1.4m long string and whirled in a horizontal circle on some nice frictionless ice at a constant speed of 7.5 m/s. a. Draw a free body diagram for the hockey puck. (3pts) b. What is the tension in the string? (3pts) c. If the tension in the string exceeds 13.5N then the string will break. What is the maximum speed the hockey puck can travel before the string breaks? (3pts) 19. A seesaw is made from a 4m long uniform density board that weighs 500N. The seesaw was poorly built because the fulcrum is actually 20cm to the right of the center of mass of the seesaw. Two children are sitting on the seesaw as seen in the A picture shown. The child on the right has a mass of 45kg and is sitting 10cm from the right edge. If the child on the left has a mass of 35kg and the seesaw is horizontal and balanced. d. Draw an extended free body diagram for the seesaw in the space below. (3pts) e. How far from the left edge of the seesaw is the child sitting? (4pts) 454 f. What is the force that the fulcrum exerts on the seesaw? (3pts)