What is the importance of centripetal force

If you touch a hot light bulb and get burned, that is an example of a. radiation b. convection c. conduction

Which atomic model was proposed as a result of j. j. thomson’s work?

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?