What is an example of centripetal acceleration? HELP ASAP!

Me with these questions if you’re it sure don’t answer

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above