8. Determinar la fuerza F necesaria para mover el sistema de la figura, si la aceleración adquirida por el sistema es de 5 m/s2
F
5 kg
12 kg
15 kg
I
I

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.