This is an incomplete scientific model of the hand-crank system in claim one. To make it complete, you need to show how energy flows through the system, and label the different forms the energy takes as it transfers through the system components. Which answer choice below correctly shows what you need to add to complete the model of this system? a
Kinetic Energy- Electrical Energy- Light and Heat Energy

b
Kinetic Energy- Potential Energy- Electrical Energy

c
Potential Energy- Kinetic Energy- Electrical Energy

d
Light Energy- Potential Energy- Electrical Energy

The authors of the paper "fudging the numbers: distributing chocolate influences student evaluations of an undergraduate course"† carried out a study to see if events unrelated to an undergraduate course could affect student evaluations. students enrolled in statistics courses taught by the same instructor participated in the study. all students attended the same lectures and one of six discussion sections that met once a week. at the end of the course, the researchers chose three of the discussion sections to be the "chocolate group." students in these three sections were offered chocolate prior to having them fill out course evaluations. students in the other three sections were not offered chocolate. the researchers concluded that "overall, students offered chocolate gave more positive evaluations than students not offered chocolate." indicate whether the study is an observational study or an experiment. give a brief explanation for your choice.