Why is the core the only layer of the Sun where energy is produced?

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions