00:01
This problem, we were given the young modulus of bone as 18 times 10 to the 9 pascal.
00:10
And this just tells us how much pressure can the bone withstand.
00:15
And we're told that bone can withstand a stress, which i'll just call alpha, of 160 times 10 to the 6 pascal's before it breaks.
00:29
And we're given the length i'll call l not of the bone as 0 .5 meters and we want to calculate how much this bone can be compressed which is delta l before it begins to break so to do this problem you need to know a certain equation that tells us the amount of stress that the bone can handle which is given as force per area and this is the variable alpha that i have.
01:02
So the amount of stress that the bone can withstand will equal its jung's modulus times the amount of strain, which i'll call beta, it can take.
01:15
In other words, the amount of compression before it begins to break.
01:19
And here we know that beta, the strain, is delta l.
01:24
The amount will be compressed divided by l -0.
01:27
So the length of the bone before the compression starts.
01:32
So we can replace that really quick...