How is stratospheric ozone created? A. Radiant energy from the sun breaks apart oxygen molecules freeing single oxygen atoms that recombine into ozone
B. When ultraviolet radiation passes through a depleted ozone layer it acts on oxygen at ground levels creating ozone
C. Ozone is formed in when sulfur and nitrogen oxides combine with water in the atmosphere
D. Ozone created from NOx and VOC gases rise from low altitudes into the stratosphere and form the ozone layer

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?