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How do you correct a teacher politely?

The post "Pulley Problem" was put up by member

The answer to this is 27 N. I asked him to clarify with his teacher. He sent a PM to me, part of which I’m putting up here with his permission.

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I did ask my teacher just yesterday, and she told me that she discussed the question with the physics department head, and he said that the answer is

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The teacher discussed this with the Head and both decided on an incorrect concept? I’m slightly shocked and dismayed. But my concerns are for future students. Does anybody have any idea how to put across the correct solution to the teacher and the dept head?

The post "Pulley Problem" was put up by member

**temaire**in: https://www.physicsforums.com/showthread.php?t=209450The answer to this is 27 N. I asked him to clarify with his teacher. He sent a PM to me, part of which I’m putting up here with his permission.

__Msg from member__**temaire**----------------------------------------------------------------------------

I did ask my teacher just yesterday, and she told me that she discussed the question with the physics department head, and he said that the answer is

**30 N**. I asked her if she could show me how the answer was 30 N, but all she said was "in the end, the Newton meter is still being weighed down by two masses that add up to 3.0 kg." …----------------------------------------------------------------------------

The teacher discussed this with the Head and both decided on an incorrect concept? I’m slightly shocked and dismayed. But my concerns are for future students. Does anybody have any idea how to put across the correct solution to the teacher and the dept head?

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