What is electricity? a) the orbit of electrons around a nucleus b) the flow of positive electric charge c) the flow of negative electric charge d) the flow of electric charge

Why is metal often used for cooking pan?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?