The correct answer is A. The strands are different. Hope this helps! :)
It took 50 joules to push a crate 2.5 meters. With what force was the crate pushed?
<span>Isotopes of argon. Argon (Ar) has 24 known isotopes, from 30Ar to 53Ar and 1 isomer (32mAr), three of which are stable, 36Ar, 38Ar, and 40Ar. On the Earth, 40Ar makes up 99.6% of natural argon.</span>
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