Which statement is correct about a flashlight battery? a. light energy and heat energy are created by it. b. the total energy of the system decreases. c. its chemical energy is transformed into light energy. d. chemical energy is destroyed when the flashlight stops working.

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

What kind of simple machine is a catapult?

Each line (unit) on the horizontal axis represents: 5 years 10 years 20 years all of the above