Physics which form of energy does a plant store when light is transformed during photosynthesis?

42.The change of matter from one phase to another is a(n)                 change.

43.Which force is responsible for holding the nucleus of an atom together?

44.A bar that is free to pivot about a fixed point is a                .

45.Which law of thermodynamics states that when heat is added to a system, it increases the internal energy of the system, and that the heat that escapes does work on the system?

46.What does the atomic number tell about an atom?

47.When a car burns fuel, which of the following best describes what happens to the energy of the system?

48.Which property of a solid measures how resistant the material is to deformation?

49.When solar energy is converted to heat, it is measured by                .