During the competition, the weightlifter lifted a barbell weighing 150 kg. Did the internal energy of the bar change at the same time?

The internal energy of the bar did not change, because the distance between the molecules of the rod and the speed of their movement did not change.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.