a) What magnitude of force must u apply to hold the platform in this position?

b) How much additional work must you do to move the platform 0.200m farther, and what maximum force must you apply?

York
2020-11-01
Answered

As part of your work out, 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 u push the platform, you compress the springs. You do 80.0G of work when u compress the springs 0.200m from their uncompressed length.

a) What magnitude of force must u apply to hold the platform in this position?

b) How much additional work must you do to move the platform 0.200m farther, and what maximum force must you apply?

a) What magnitude of force must u apply to hold the platform in this position?

b) How much additional work must you do to move the platform 0.200m farther, and what maximum force must you apply?

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yagombyeR

Answered 2020-11-02
Author has **92** answers

a) The average force is $\frac{80\text{}J}{0.200\text{}m}=400\text{}N$ , and the forceneeded to hold the platform in place is twice this, or 800 N.

b) Doubling the distance quadruples the work so an extra 240 J of work must be done. The maximum force is quadrupled, 1600N

b) Doubling the distance quadruples the work so an extra 240 J of work must be done. The maximum force is quadrupled, 1600N

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