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

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

two teams pulling a rope in opposite directions, both with a force of 3670 n

an 80-n rope holding up a 920-n weight with a tension of 1000 n.

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

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

Explanation:

An object is said to be in equilibrium when the net force acting on it is zero.

Let's analyze each option:

- A glass table able to withstand a normal force of 450 N when a 500 N object is placed on it.  --> NON-EQUILIBRIUM. In fact, the downward force (the weight of the object, 500 N) is more than the maximum upward normal force (450 N), so the net force is non-zero.

- Two teams pulling a rope in opposite directions, both with a force of 3670 N  --> EQUILIBRIUM. Both forces are equal in magnitude and opposite in direction, so the net force is zero.

- An 80-N rope holding up a 920-N weight with a tension of 1000 N.  --> EQUILIBRIUM. The total force pulling on one side is 80 N + 920 N = 1000 N, which is equal to the force on the other side.

- A 500-newton sign hanging from two chains of insignificant weight, each with a tension of 250 N --> EQUILIBRIUM. The total force pushing on one side is 250 N*2 = 500 N, which is equal to the force on the other side.

a and c

explanation:

both a and c are correct answers to my knowledge, it's been a bit since i've done anything related to magnetic fields, but it should be right.