Traffic Light 2: Three widely separated traffic lights on U.S. Route 1 operate independently of each other. The probability that you will be stopped at any one of the lights is 40%. a. Show how to calculate the probability of being stopped at exactly two of the three lights. b. Which is more probable, being stopped at more than one light or being stopped at one or fewer lights? Show results that support your answer. c. Suppose that you make the trip four times, encountering a total of 12 lights. Make a scatter plot of the probability distribution. Sketch the result.

Exam 3 Study Guide Momentum, Rotational Motion, Torque Momentum moves in the same direction as velocity and is given by the equation: p=mv The initial momentum is always the same as the final momentum. In the problems that ask for recoil motion use the following formula often times in momentum problems they are paired with translational kinematic equations: m1v 1m v2 2 An open systems is a system that gains or loses mass. This is the formula to us for the rocket or a similar system: ∆ M F thrust ∆t ) The angular position is given in polar coordinates and is f