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

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SUMMARY

The discussion centers on calculating the reduction in standing height when a man with a height of 185 cm bends his knee at a 30-degree angle. The relevant anatomical measurements include a femur length of 60 cm and a tibia length of 50 cm. Participants emphasize the importance of showing calculations to identify errors and suggest using trigonometry to solve the problem. The conversation also touches on the intersection of mathematics and biology in understanding body mechanics.

PREREQUISITES
  • Basic understanding of trigonometry
  • Knowledge of human anatomy, specifically femur and tibia lengths
  • Familiarity with the concept of center of mass
  • Ability to create and interpret geometric sketches
NEXT STEPS
  • Study trigonometric functions and their applications in real-world scenarios
  • Learn about the biomechanics of human movement
  • Explore the concept of center of mass in relation to body posture
  • Practice creating sketches to visualize anatomical problems
USEFUL FOR

This discussion is beneficial for students studying biomechanics, anatomy enthusiasts, and anyone interested in the mathematical principles applied to human movement and posture.

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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