Need with science questions!
which best describes how the law of conservation of energy is obeyed in this closed physical system?
a.
the final mechanical energy of the system is the difference between the original mechanical energy of the system and the change in mechanical energy of the system (δe). when the piston does work (w), only the mechanical energy added to the system (q) is transferred to kinetic energy.
b.
the final thermal energy of the system is the sum of the original internal energy of the system and the change in energy of the system (δe). when the piston does work (w), all the thermal energy is transferred to kinetic energy.
c.
the final mechanical energy of the system is the sum of the original internal energy of the system and the change in energy of the system (δe). when the piston does work (w), all the mechanical energy is transferred to kinetic energy.
d.
the final thermal energy of the system is the difference between the original internal energy of the system and the change in energy of the system (δe). when the piston does work (w), only the thermal energy added to the system (q) is transferred to kinetic energy.

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

Fill in the blanks with the numbers is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.