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Q. At a certain location, the horizontal component of the earth's magnetic field is 4.90 10-5 T, due north. A proton moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the proton.

Q. Two cars each of mass 1300 kg are approaching each other on a head on collision course. Each speedometer read 19m/s. What is the magnitude of the total momentum of the system?

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