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Q. Two indentical spheres each has mass m and carries a charge q, are suspended from the ceiling. The electrostatic repulsion keeps the two spheres apart. What is the angle?

Q. The velocity of a particle moving in the xy plane is given by = (5.5t - 4.5t2)i + 8.3j , with in meters per second and t (> 0) in seconds. At t = 1.8 s and in unit-vector notation what positive time does the speed equal 10 m/s?

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