Which does not describe the relationship between the nucleus and the electron cloud of an atom?
a. the electron cloud takes up much more space than the nucleus.
b. he masses of the nucleus and electron cloud are balanced.
c. the electrons move much faster than the particles in the nucleus.
d. the charges of the nucleus and electron cloud are balanced.

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?