A truck at the top of the hill has higher gravitational potential energy then when it is at the bottom of the hill. Why does it roll downhill? 1. To increase its kinetic energy
2. To lower its potential energy
3. To increase the entropy of the universe
4. To decrease the entropy of the universe

An exothermic reaction is conducted in an insulated calorimeter filled with water. the calorimeter is then sealed so that there is no heat exchanged between the contents of the container and the surrounding air. which of the following statements is true about the reaction?

Table sugar completely dissolved in water is an example of a?

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.