When a cell uses energy to move substances across the membrane it is called:

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?