A uniform drawbridge 9m long is attached to the roadway by a frictionless hinge at one end and can be
raised by a cable at the other end. The bridge is at rest suspended 30 degrees above the horizontal when
the cable breaks. (a) Find the angular acceleration of the drawbridge just as the cable breaks. (b) What is
the angular speed of the drawbridge when it becomes horizontal?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?