Which of the following objects is NOT in a state of equilibrium?

Two teams pulling a rope in opposite directions, both with a force of 3670 N

A glass table able to withstand a normal force of 450 N when a 500 N object is placed on it.

A 500-newton sign hanging from two chains of insignificant weight, each with a tension of 250 N

An 80-N rope holding up a 920-N weight with a tension of 1000 N.

Question

Which of the following objects is NOT in a state of equilibrium?
 	
	Two teams pulling a rope in opposite directions, both with a force of 3670 N

	A glass table able to withstand a normal force of 450 N when a 500 N object is placed on it.

	A 500-newton sign hanging from two chains of insignificant weight, each with a tension of 250 N

	An 80-N rope holding up a 920-N weight with a tension of 1000 N.

anonymous · Answer

B.... if a glass table can only withstand a force of 450N and you put 500N on it it would break.