A student with a mass of 50 kg is holding a 10 kg dumbbell her right...

 

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A student with a mass of 50 kg is holding a 10 kg dumbbell her right arm while it is hanging down vertically beside her body. Q2(a) Calculate the weight of the student and the dumbbell. Q2(b) Draw a free body diagram for the dumbbell. Explain how you decided on the length of the arrows and how you labelled the diagram. Q2(c) Draw a free body diagram for the student. Explain how you decided on the length of the arrows and how you labelled the diagram. The student then moves the dumbbell at constant speed until her arm is horizontal. The length of her arm is 60 cm, and it takes 0.86 s to do this. Q2(d) Calculate the speed of the dumbbell during this motion. Q2(e) Calculate the angular acceleration of the dumbbell during this motion. In this position, her deltoid muscle exerts a force of 400 N at an angle of 15.0° above the horizontal on the humerus, as shown in the figure. 15.0⁰ Deltoid muscle Humerus Q2(f) Calculate the x-component of this force. Q2(g) What is the magnitude and direction of the force exerted by the humerus on the deltoid muscle? Explain. A student with a mass of 50 kg is holding a 10 kg dumbbell her right arm while it is hanging down vertically beside her body. Q2(a) Calculate the weight of the student and the dumbbell. Q2(b) Draw a free body diagram for the dumbbell. Explain how you decided on the length of the arrows and how you labelled the diagram. Q2(c) Draw a free body diagram for the student. Explain how you decided on the length of the arrows and how you labelled the diagram. The student then moves the dumbbell at constant speed until her arm is horizontal. The length of her arm is 60 cm, and it takes 0.86 s to do this. Q2(d) Calculate the speed of the dumbbell during this motion. Q2(e) Calculate the angular acceleration of the dumbbell during this motion. In this position, her deltoid muscle exerts a force of 400 N at an angle of 15.0° above the horizontal on the humerus, as shown in the figure. 15.0⁰ Deltoid muscle Humerus Q2(f) Calculate the x-component of this force. Q2(g) What is the magnitude and direction of the force exerted by the humerus on the deltoid muscle? Explain.

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