In the diagram below, the uniform metre rule is pivoted at X and held up at the point Y by a rope.
rope

Given that the weight of the metre rule is 4.0 N, calculate the tension in the rope that
is needed to ensure that the ruler stays horizontal.

i think if it were me i whould divide 300 dide 15

step-by-step explanation:

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )