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one astronaut in one rocket is climbing a ladder,

Quoteone astronaut in one rocket is climbing a ladder,How about the climbing astronaut radiates more heat?

Where did the climbing energy go?

You are forgetting that with every action, there is an equal and opposite reaction.

Jartza. You say--"there is no reaction involved climbing up a ladder." This is untrue and you can do the experiment yourself. Put a block of wood on a scale and stand on the scale next to it. Notice the weight registered. Step up onto the block and the measured weight will go up while you are pushing down on the block to raise yourself. Equal and opposite reaction. Steve

Yes, but "OUR" climber uses his leg to push the ladder with a force that is the same as the climbers "weight".

Has anyone considered that it might be a little bit difficult to climb up a ladder while being subjected to 3-6g? The original question did state that the rocket was accelerating in a gravity field. I am assuming however that this accelerating rocket is attempting to reach escape velocity of 11.2km/second. []

Yes, but a guy climbing up a ladder in an accelerating rocket is just continuously shifting his weight from a step to another step, increase of weight on one step is canceled out by decrease of weight on another step.

Climber is not stealing energy from rocket. It's more like climber is helping the rocket to accelerate, because in the endclimber's chemical energy has been turned into rocket's kinetic energy, when the climber has bumped on the ceiling, or otherwise stopped climbing.

Jartza:You are very confused. Newton is a unit of force. A ~70kg astronaut standing on a ladder in a rocket before lift off exerts 700N of force downward on the ladder. This is because his mass is being accelerated downward by the earth's 1g. If the rocket takes off and accelerates upward at 1g, thereby increasing the total acceleration downward for the rocket and its contents to 2g, the force on the ladder exerted by the astronaut increases to 1400N. If he then takes a step upward on the ladder with the acceleration of 1/7g the force he exerts on the ladder increases to 1500N while he is pushing down.Steve

Jartza:I, for one, am not going to keep chasing your changing questions. In twenty some posts several people have tried to help you understand where you are in error. However, you don't admit your errors but instead continue on your circle of questions. You stated the 700N man bit two times and have been corrected. Do you now admit that the force a man exerts on a ladder increases when he climbs?Steve

The only way the fly can change the weight of the plane is by either altering the mass of itself, the air or the plane, or by altering the strength of gravity. The fly cannot do this, therefore it cannot affect the weight.