You observe a defensive back on the football team backpedal…

You observe a defensive back on the football team backpedal off the line of scrimmage. They plant their right foot and explode forward and immediately fall down. When you approach them, you hear them exclaim “”someone kicked me in the back of the leg!”” You immediately suspect what injury?

While palpating the insertion point of the semitendinosus, g…

While palpating the insertion point of the semitendinosus, gracilis, and sartorius, the patient complains of significant tenderness. The patient also reports a recent increase in training, presents with pain that increases with activity, and presents with no significant weakness. What condition do you initially suspect?

Three point charges,  Q 1 = Q 2 = + 3…

Three point charges,  Q 1 = Q 2 = + 3 . 00 × 10 – 9   C  and  Q 3 , are located on a circular arc of radius R = 4 . 00   c m with center O at  ( 0 ,   0 ) c m , as shown in Fig. 1.1. (a) What is  Q 3  equal to if the electric field at O  ( 0 ,   0 ) c m  is zero? (b) What are the magnitude and direction of the total electric force exerting on a q = – 5 . 00 × 10 – 10   C point charge placed at P ( – 2 . 00 ,   0 ) c m ? (c) What would be the work done by electric force if is moved from point O to point P ( – 2 . 00 ,   0 ) c m ? Two identical spherical shells (M and N) of radius 4 . 00   c m are added in space with the center of shell M at  ( 3 . 00 ,   0 ) c m  and shell N at  ( 0 ,   – 9 . 00 ) c m , as shown in Fig. 1.2. If  + 5 . 00 × 10 – 9   C  and  – 5 . 00 × 10 – 9   C  are uniformly distributed on M and N, respectively. (d) What are the magnitude and direction of electric field at point O contributed by  Q 1 ,  Q 2 ,  Q 3 , and the charges on M and N? (e) What are the magnitude and direction of electric field at point P contributed by  Q 1 ,  Q 2 ,  Q 3 , and the charges on M and N? fig_q17_final.jpg