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Question: A positive charge q is placed at the center of a circular ring of radius R. The ring carries a uniformly distributed negative charge of total magnitude -Qo.
Part A: If its mass is m, what is its period?
I need help to solve the above question and express your answer in terms of the variables Qo, q, R, and appropriate constants.
An astronaut travels at a speed of 0.98c from the Earth to a distant star that is 6.4*1017 m away. If the astronaut is 26 years old when she begins her trip, how old is she when she arrives at the star?
What is a vertical velocity of the ball
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