0 Members and 2 Guests are viewing this topic.
In regards to Earth’s interaction with something else, just concentrating on the electromagnetic energy received and we have already quantified this value relative to the rotational Kinect energy, we know this energy input contravenes the conditions required for the laws of conservation of momentum We can observe these chains of events of various energy transfers that the Suns energy induces, for example the variations in pressure/temperature generating velocity and number of collisions of the molecules of the atmosphere fluctuations. The friction of the millions of metric tons of water dropped down to the surface at velocity’s not in accordance with conservation of momentum, the dynamics of the waves of the oceans.The wind passing across earth’s surface with varying degrees of friction, depending on the type of surface, all start chains of events that can and does impact on the sum total of earth’s Momentum through transfer of earth’s rotational energy to other forms , that are not compatible with conservation of momentum.
So the question at this point should be why you believe momentum is protected from these transfers of energy.
My phone is sat on the table in front of me.It is neither an isolated, nor a closed system.And yet, it will not suddenly start spinning.What you need to have, to get it spinning, is a torque.
As stated by the laws of conservation of energy with no mention of an outside torque force required, just the transfer of energy is sufficient.
Hi all so in regards to conflating the criteria, let’s start with the first couple of paragraphs of the laws of conservation of momentum https://en.m.wikipedia.org/wiki/Conservation_of_momentum It states the momentum of an isolated system remains constant.
In nonrelativistic classical mechanics, a closed system is a physical system that doesn't exchange any matter with its surroundings, and isn't subject to any net force whose source is external to the system.[1][2] A closed system in classical mechanics would be equivalent to an isolated system in thermodynamics. )
Therefore as stated by the previous posts Regarding the solar energy received, Earth does not meet the criteria in regards to conservation of momentum.
There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.
Quote from: Halc on 18/08/2020 20:42:47 There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.(Unless its kinetic energy)
And Halc states the energy laws are irrelevant to the momentum laws
Quote from: Petrochemicals on 18/08/2020 21:51:49Quote from: Halc on 18/08/2020 20:42:47 There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.(Unless its kinetic energy)I can impart kinetic energy to a system without any external application of force from outside the system, so this is wrong.
Quote from: Halc on 19/08/2020 00:25:41Quote from: Petrochemicals on 18/08/2020 21:51:49Quote from: Halc on 18/08/2020 20:42:47 There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.(Unless its kinetic energy)I can impart kinetic energy to a system without any external application of force from outside the system, so this is wrong.Nuh huh. I can impart kinetic energy{ via acceleration from outside the system ?} to a system without any external application of force from outside the system https://en.m.wikipedia.org/wiki/Kinetic_energy
The rate of change of angular momentum is the torque divided by the moment of inertia.If the torque is zero then the change in angular momentum is also zero.
Thanks petrochemicals, I made that point in my first post in this thread #38BC every time you see trees bending in the wind. think about what age you were when you learnt about momentum.
I'm still waiting for someone to explain how there's a change in angular momentum without a torque .How do you get round this ?Quote from: Bored chemist on 18/08/2020 18:12:27The rate of change of angular momentum is the torque divided by the moment of inertia.If the torque is zero then the change in angular momentum is also zero.