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Q. Orange light (λvacuum = 614 nm) shines on a soap film (n = 1.29) that has air on either side of it. The light strikes the film perpendicularly. What is the minimum thickness of the film for which constructive interference causes it to look bright in reflected light?

Q. An automobile club plans to race a 740 kg car at the local racetrack. The car needs to be able to travel around several 145 m radius curves at 83 km/h. What should the banking angle of the curves be so that the force of the pavement on the tires of the car is in the normal direction?

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