Which of the following reactions release more energy?

fusion reactions
nuclear chain reactions
fission reactions
chemical reactions

An airplane flying parallel to the ground undergoes two consecutive displacements. the first is 76 km at 39.8◦ west of north, and the second is 156 km at 59.9◦ east of north. what is the magnitude of the plane’s total displacement? answer in units of km. 020 (part 2 of 2) 10.0

What is the speed of an object at a given moment?

Which best describes the difference between internal and thermal energy?