Which of the following statements is true?
a. fusion splits atoms.
b. uranium 235 is produced from fission.
c. the heat from stars is created by fusion.
d. enrico fermi created the first nuclear bomb.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Contains chemical energy. a. heat b. light c. natural gas

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.