That would be the atom I believe.
Answer:
an idealized cycle of processes undergone by rocks in the earth's crust
It’s cause by the fact that the earth is tilted 23.5 degrees
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)
