You are holding a balloon which you charged by rubber against your hair. The balloon is holding Q amount of charge. There is a foam ball 3 meters away
and carrying a charge of -0.002 C. They attract each other with a force of 200
N. Find charge Q. Is it a positive or negative charge, why?

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented. b)scientists had not completely finalized their results, which took 30 years. c)cigarettes were cheaply available and media channels were very inefficient. d)cigarette manufacturers were trying hard to bring an alternative into the market

Can anybody me with this? ? (picture included.)

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?