The answer is A. Hope this helps. :)
It would be a high pitched sound. Hope this helps.
Answer:
Stephen hawking if his family were scientists
The weight is 45 N, because the three chains hold the sign, and each contributes 15 N.
Notice that the mass would be the weight/acceleration of gravity, m = 45/9.8 kg. But they ask the weight (force, so Newtons)
