- #1
eosphorus
- 78
- 0
please help on this thought experiment in which kinetic energy seems to be created
first i would like to set two things straight: first this is a question of something that seems very strange to me not an affirmation, second my intention is not to challenge but to try to help trying to improve this sad world where kids starve for energy problems among other things, after this introduction here is my thought experiment and the impossible conclusion i reach, that's why i would apreciatte very much someone pointing the mistake on my experiment, here it goes:
imagine two counterotatory tetherballs unwrapping around the earth,
they have a mass of 1000 kg each, a initial radius of 1000 km, a final radius of a million km and the initial speed, the same than the final speed, of 1000 m/s. someone may say that because of conservation of angular momentum the speed in the end will be 1000 times smaller than the initial one because the radius has increased a thousand times, but then consider that if it goes from a radius of 1 million km to a radius of 1000 km then the speed of the tetherballs would increase 1000 times without having apported any energy to the system
so once the tetherballs have a radius of 1 million km you send one away to meet the universe cutting the cable and to the cable of the other tetherball you add a component that transforms the cable into rigidness, now being the cable rigid, the speed of 1000m/s and the distance of 1 million km the linear speed of the ball will be transferred to Earth as rotation
you have started with a given linear kinetic energy and you end with rotational kinetic energy 1000 times bigger than the initial one because the speed is the same but the radius 1000 times bigger so the momentum transferred to Earth seems 1000 times bigger than the initial one
please forgive me if i have made an obvious mistake but that's why i post it here
first i would like to set two things straight: first this is a question of something that seems very strange to me not an affirmation, second my intention is not to challenge but to try to help trying to improve this sad world where kids starve for energy problems among other things, after this introduction here is my thought experiment and the impossible conclusion i reach, that's why i would apreciatte very much someone pointing the mistake on my experiment, here it goes:
imagine two counterotatory tetherballs unwrapping around the earth,
they have a mass of 1000 kg each, a initial radius of 1000 km, a final radius of a million km and the initial speed, the same than the final speed, of 1000 m/s. someone may say that because of conservation of angular momentum the speed in the end will be 1000 times smaller than the initial one because the radius has increased a thousand times, but then consider that if it goes from a radius of 1 million km to a radius of 1000 km then the speed of the tetherballs would increase 1000 times without having apported any energy to the system
so once the tetherballs have a radius of 1 million km you send one away to meet the universe cutting the cable and to the cable of the other tetherball you add a component that transforms the cable into rigidness, now being the cable rigid, the speed of 1000m/s and the distance of 1 million km the linear speed of the ball will be transferred to Earth as rotation
you have started with a given linear kinetic energy and you end with rotational kinetic energy 1000 times bigger than the initial one because the speed is the same but the radius 1000 times bigger so the momentum transferred to Earth seems 1000 times bigger than the initial one
please forgive me if i have made an obvious mistake but that's why i post it here