Darby has a very high-energy dog named Lily. Lily's parents were both very energetic dogs. Darby trains Lily to chase a tennis ball when she throws it and to bring it back. Lily can play fetch for hours and is always ready for a game. How has Lily's behavior been influenced by her heredity?

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

Most short-period comets do not have randomly oriented orbits because

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?