我也贴道题

[蓝离阵列]

A 90-kg "bungee-jumper" leaps from a bridge above a river . The bungee cord has an unstreched length of 20 meters and it is streched additional 32 meters begore the jumper rebonds, modle the cord as a linear spring, the damped constant is 4 N-s/m, what are the period and frequency of vertical oscillation?, express the general solution:smokin:

 

[1784]

sofa sofa sofa

 

[1784]

a-hahahahahaha, I got the sofa hehehe

 

[文 武]

use the formulas for simple harmonic motion~

 

[大漠张三]

you have to use integration....

lol wtf, i don't get the question

 

[文 武]

T = 2pi sqrt(m/k)

f = 1/T

 

[文 武]

why integration, it's a simple physics problem involving SHM~

 

[蓝离阵列]

最初由 文 武 发布
T = 2pi sqrt(m/k)

f = 1/T

sorry wrong answer, it's damped system

 

[文 武]

actually, the additional 12 m is the amplitude~

 

[蓝离阵列]

hint: general solution should be look like : x=(e^-dt)*(A*sinwt+Bcoswt) ****w presents wd which is damping frequency

 

[文 武]

其是我们都没在attempt solving this problem :blowzy:

 

[蓝离阵列]

最初由 文 武 发布
T = 2pi sqrt(m/k)

f = 1/T

for undamped system w=sqrt(m/k) and T=2pi/sqrt(m/k)

 

[夜色]

最初由 蓝离阵列 发布
hint: general solution should be look like : x=(e^-dt)*(A*sinwt+Bcoswt) ****w presents wd which is damping frequency

rofl pwnt

 

[蓝离阵列]

hint2: determine K value 1st

 

[蓝离阵列]

最初由 夜色 发布


rofl pwnt

lol, me and justin got bored