The north pole of one bar magnet is near the south pole of another bar magnet. What happens to the magnets?
A. They twist away from each other.
B. They repel each other
C. They attract each other.
D. They neither attract nor repel each other.

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According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Estimate the schwarzschild radius (in kilometers) for a mini-black hole formed when a superadvanced civilization decides to punish you (unfairly) by squeezing you until you become so small that you disappear inside your own event horizon. (assume that the your weight is 50 kg)