Mastering Physics: HW 23 Google Chrome session.masteringphysics.com 41819344 PHY

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Mastering Physics: HW 23 Google Chrome session.masteringphysics.com 41819344 PHY 161 Cole Fall 14 Hw 23 Exercise 6.38 Exercise 6.38 What magnitude of force must you apply to hold the platform in this position? As part o your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. When you push the platform, you compress the springs. You do an amount of work of 85.0J when you compress the springs a distance of 0.230m from Submit My Answers Give Up their uncompressed length. Part B How much additional work must you do to move the platform a distance 0.230m farther? Submit My Answers Give Up Part C What maximum force must you apply to move the platform to the position in Part B? Submit My Answers Give Up dh Help Close Resources previous l 6 of 7 next Continue 38 PM ENG 10/21/2014

Explanation / Answer

a)
Work = 0.5kx^2
spring constant K = 2W/x^2 = 2*85/(0.23)^2 = 3213.6 N/m
Magnitude of force =kx = 3213.6*0.23 = 739 N

b)

W =0.5*3213.6*(0.46)^2 = 340 J
Theadditional work required is = 340 - 85 = 255 J

c)

Force , F = 3213.6*0.46 = 1478.3 N

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