Which statement describes the pattern in the density of gases in the atmosphere?

A. They are least dense in the atmosphere near sea level

B. They are less dense near the top of the atmosphere

C. They are densest near the middle of the

atmosphere

D. They are every dense thoughout the attesohere

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 an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?