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phy131studiof16:lectures:chapter12 [2016/07/29 12:20] mdawber [14.P.025] |
phy131studiof16:lectures:chapter12 [2016/10/25 10:20] (current) mdawber [Conditions for stable equilibrium] |
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| $\frac{F_{hx}}{\cos\phi}=\frac{(mg+\frac{1}{2}m_{a}{g})\cos\theta}{\sin(\phi+\theta)}$ | $\frac{F_{hx}}{\cos\phi}=\frac{(mg+\frac{1}{2}m_{a}{g})\cos\theta}{\sin(\phi+\theta)}$ | ||
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| - | ===== 14.P.030 ===== | ||
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| This [[http://www.youtube.com/watch?v=K5QGoP6bXaY|circus trick]] looks pretty difficult. | This [[http://www.youtube.com/watch?v=K5QGoP6bXaY|circus trick]] looks pretty difficult. | ||
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| - | {{youtube>K5QGoP6bXaY?large}} | ||
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| But actually it isn't! | But actually it isn't! | ||
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| - | {{youtube>FKMTRsOSKQU?large}} | ||
| An object whose center of gravity is below it's point of support will be in stable equilibrium so [[http://www.youtube.com/watch?v=FKMTRsOSKQU&feature=player_embedded|riding a unicycle on a high wire]] is easy if there is weight suspended from it like the one at [[http://www.cosi.org/|COSI]]. | An object whose center of gravity is below it's point of support will be in stable equilibrium so [[http://www.youtube.com/watch?v=FKMTRsOSKQU&feature=player_embedded|riding a unicycle on a high wire]] is easy if there is weight suspended from it like the one at [[http://www.cosi.org/|COSI]]. | ||
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| $B$ is the [[wp>Bulk_modulus|bulk modulus]]. | $B$ is the [[wp>Bulk_modulus|bulk modulus]]. | ||
| - | ===== 14.P.042 ===== | ||
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| - | ===== 14.P.051 ===== | ||
| ===== Strength of materials ===== | ===== Strength of materials ===== | ||
