CoM reduced by total body height when bending your knee X degrees

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Homework Help Overview

The discussion revolves around a physics problem involving the calculation of the change in center of mass when a person bends their knee. The scenario includes specific measurements such as standing height, femur length, and tibia length.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss the application of trigonometry to determine the reduction in height when bending the knee. There are questions about the understanding of trigonometric rules and the necessity of showing calculations to identify errors.

Discussion Status

The discussion is ongoing, with some participants encouraging the original poster to provide a sketch or calculations to facilitate assistance. There is recognition of the need for effort in the problem-solving process, but no consensus has been reached on the approach or solution.

Contextual Notes

Participants note the importance of adhering to forum rules regarding effort in homework-like questions. There is also a light-hearted acknowledgment of the combination of mathematics and biology in the problem context.

Pushies
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Lets say that a man with a standing height of 185cm bent his knee 30 degrees, how many centimeters will be reduced from his standing height? Assume his femur length is 60cm and his tibia (shin) length is 50cm.

Can anyone give me a hint?
I've tried to use trigonometry but i don't think i fully understand the rules of trigonometry because my answer doesn't make sense and I am afraid to show my calculations here because it looks too dumb.

Thanks in advance.
 
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Hello, and :welcome: !

PF rules require you to post an effort nonetheless; or we are not allowed to assist.
Better come up with at least a clarifying sketch before a mentor removes your thread !
Good chance you'll see the light when you make the sketch !

Oh, and: good you're not asked to say anything about the center of mass -- standing height is a lot easier :wink: !
 
How can we determine what went wrong if you don't show your calculations?

As this is a homework-like question I moved the thread to our homework section.
 
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Pushies said:
im afraid to show my calculations here because it looks too dumb.
Compared with thinking we can tell you where you are going wrong without seeing your attempt?
 
Pushies said:
Lets say that a man with a standing height of 185cm bent his knee 30 degrees, how many centimeters will be reduced from his standing height? Assume his femur length is 60cm and his tibia (shin) length is 50cm.

Can anyone give me a hint?
I've tried to use trigonometry but i don't think i fully understand the rules of trigonometry because my answer doesn't make sense and I am afraid to show my calculations here because it looks too dumb.

Thanks in advance.
Is this question a combo of maths and biology?😂😂
 

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