homework1 - CE 222 ENGINEERING MECHANICS II FALL 2003 2004...

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CE 222 ENGINEERING MECHANICS II ( FALL 2003 – 2004 ) HOMEWORK I ( http://www.ce.metu.edu.tr/~ce222 ) Date of Assignment : October 7th 1. Suppose that a person unwisely drives at 120 km/hr in an 80 km/hr zone and passes a police car going at 80 km/hr in the same direction. If the police officers begin constant acceleration at the instant they are passed and increase their velocity to 130 km/hr in 4s, how long does it take them to be level with the pursued car? 2. A car is traveling at 48 km/hr when a traffic light 90m ahead turns amber. The light will remain amber for 5s before turning red. (a) What constant acceleration will cause the car to reach the light at the instant it turns red, and what will the velocity of the car be when it reaches the light? (b) If the driver decides not to try to make the light, what constant rate of acceleration will cause the car to come a stop just as it reaches the light? 3. Collar A starts from rest at t =0 and moves upward with a constant acceleration of 90 mm/s 2 . Knowing that collar B moves downward with a constant velocity of 400 mm/s,
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homework1 - CE 222 ENGINEERING MECHANICS II FALL 2003 2004...

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