1) For this problem i got the answer .01 but it was wrong. Can someone help me?
ID: 1393525 • Letter: 1
Question
1) For this problem i got the answer .01 but it was wrong. Can someone help me?
2) I need help to solve for part A for this problem Thanks!
Problem 10.21 Part A The elastic energy stored in your tendons can contribute up to 350mm W%) of your energy needs when running. Sports scientists have studied the change in length of the knee extensor tendon in sprinters and nonathletes. They find (on average) that the sprinter' tendons stretch 41 mm, while nonathletes' stretch only 32mm The spring constant for the tendon is the same for both groups, 31N/mm. What is the difference in maximum stored energy between the sprinters and the nonathletes? Express your answer using two significant figures. AE=Explanation / Answer
1)
spring constant, k = 31 N/mm = 31000 N/m
delta E = 0.5*k*(x2^2-x1^2)
= 0.5*31000*(0.041^2 - 0.032^2)
= 10.18 J
2)
A) workdone on partcile from x = 0 to x = 2 m
Workdone = 0.5*10*2(area uder F-x curve)
= 10 J
now Apply Work-energy theorm
W = 0.5*m*(v2^2-v1^2)
v2 = sqrt(v1^2 + 2*W/m)
= sqrt(3.4^2 + 2*10/1.7)
= 4.83 m/s
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