An atom is an example of a system, or a group of objects that interact with each other. Scientists often use a model to represent a system that is hard to see. Models can also be used to show a complicated system in a simpler way. Because atoms are so hard to see, people use atomic models to represent the way protons, neutrons, and electrons are arranged in an atom. The diagram below is an example of an atomic model. In this model, a positive electrical charge is shown with the plus symbol (+) and a negative electrical charge is shown with the minus symbol (–). Use the words below to label each part of the model. a)electron b)proton c)atoms d)neutron

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Adiagram show how a converging lens can produce a real image and virtual image

4.at 0 ºc, some amount of energy is required to change 1 kg of water from a solid into a liquid. if you had a 2 kg piece of ice, what effect would this have on the amount of thermal energy required to change the water from a solid to a liquid? it would require more energy to change solid water into liquid water because there are more molecules in this larger piece of ice. it would still require the same amount of energy to change solid water into liquid water because the entire piece of ice would still gain the same amount of energy in each case. it would require energy to be removed from the 2 kg piece of ice. the larger piece of ice already has more total energy than the smaller piece of ice, so energy must be removed for the ice to become liquid. it would require less energy to change solid water into liquid water because the energy would spread through the ice more quickly and the ice already has a larger total amount of energy because it is larger than a 1 kg piece of ice.