Recent content by Becky6

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    Second moment of area of a hollow triangle

    Greetings! Can someone please help me figure out how to calculate the second moment of area for a hollow isosceles triangle? Is there an equation available somewhere? Or can I simply subtract a smaller triangle from a larger one, using the equation I=bh3/36? (so I= b1h13/36 -b2h23/36) Also, is...
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    Undergrad Spring to propel object at specific velocity

    Thank you both so much! That makes sense. With your help I was able to figure out what I need.
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    Undergrad Spring to propel object at specific velocity

    I want to make a small spring piston to propel a 3 mm stainless steel ball to hit a target at a velocity of 15 m/s from just a few inches away. How can I calculate/determine the right spring to use?
    • Becky6
    • Thread
    • Specific Spring Velocity
    • Replies: 4
    • Forum: Mechanics