As part of your daily workout, you lie on your back and push with your feet agai
ID: 2140118 • Letter: A
Question
As part of 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 65.0 J of work when you compress the springs 0.400 m from their uncompressed length.
As part of 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 65.0 J of work when you compress the springs 0.400 m from their uncompressed length. What magnitude of force must you apply to hold the platform in this position? How much additional work must you do to move the platform 0.400 m farther, and what maximum force must you apply?Explanation / Answer
Force applied = K x
energy stored = 0.5 K x^2
force = 325 N
extra energy = 0.5 K (4x^2 - x^2) = 195 J
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