The discussion revolves around the total mechanical energy of a rocket when its speed is less than the escape velocity. Participants are exploring the relationship between kinetic energy (KE) and potential energy (PE) in this context.
The discussion is ongoing, with some participants providing insights and others seeking clarification on the original question's wording. There is acknowledgment of the need for proper formatting and attempts in the initial post, which may influence the level of assistance offered.
There is a noted confusion regarding the terminology used in the question, specifically the mention of "force" instead of "energy," which has led to some misinterpretation. Additionally, the original poster's lack of adherence to forum guidelines has been highlighted by other participants.
I appreciate that it was a bit tricky with this one, but the rule on homework forums is to give hints and point out errors, not provide complete solutions.Gabriele Pinna said:I guess C because at infinity we will have PE=0 and KE> 0 or equal to zero. As the rocket has not the tendency to move to infinity we conclude that
PE+KE <0
haruspex said:I appreciate that it was a bit tricky with this one, but the rule on homework forums is to give hints and point out errors, not provide complete solutions.
Correspondingly, @GrimReaper should have used the homework template and shown some attempt before meriting any help.
I'm sorry if it was a mistake. And I'm totally new to this so I actually don't know how to use this. Thank you for the directions @haruspex.haruspex said:I appreciate that it was a bit tricky with this one, but the rule on homework forums is to give hints and point out errors, not provide complete solutions.
Correspondingly, @GrimReaper should have used the homework template and shown some attempt before meriting any help.
Please read https://www.physicsforums.com/threads/guidelines-for-students-and-helpers.686781/GrimReaper said:I'm sorry if it was a mistake. And I'm totally new to this so I actually don't know how to use this. Thank you for the directions @haruspex.
Thank you very much.haruspex said:
The reference to force in the question statement is clearly an error. It should have said energy.mjc123 said:Why is there no answer to this question? (Apart from the obvious fact that the question asks about force and gives answers in energy...)
oh sorry, actually its energy. I mistakenly typed force.haruspex said:The reference to force in the question statement is clearly an error. It should have said energy.
The answer is given in post #2.