Problem 8.47 MasteringPhysics Problem 8.47 MasteringPhysics Problem 8.47 Masteri

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Problem 8.47 MasteringPhysics Problem 8.47 MasteringPhysics Problem 8.47 MasteringPhysics Problem 8.47 MasteringPhysics 16 of 18 Problem 8.47 Problem 8.47 Tap image to zoom Tap image to zoom Part A What is the tension in the erector muscle? Hint:Align your x-axis with the axis of the spine. Express your answer to two significant figures and include the appropriate units. T = SubmitGive Up Part B A force from the pelvic girdle acts on the base of the spine. What is the component of this force in the direction of the spine? (This large force is the cause of many back injuries). Express your answer to two significant figures and include the appropriate units. Fp.g. = SubmitGive Up Part A What is the tension in the erector muscle? Hint:Align your x-axis with the axis of the spine. Express your answer to two significant figures and include the appropriate units. T = SubmitGive Up Part A What is the tension in the erector muscle? Hint:Align your x-axis with the axis of the spine. Express your answer to two significant figures and include the appropriate units. T = SubmitGive Up T = T = SubmitGive Up Part B A force from the pelvic girdle acts on the base of the spine. What is the component of this force in the direction of the spine? (This large force is the cause of many back injuries). Express your answer to two significant figures and include the appropriate units. Fp.g. = SubmitGive Up Part B A force from the pelvic girdle acts on the base of the spine. What is the component of this force in the direction of the spine? (This large force is the cause of many back injuries). Express your answer to two significant figures and include the appropriate units. Fp.g. = SubmitGive Up Fp.g. = Fp.g. = SubmitGive Up Continue T = 16 of 18 Problem 8.47 When you bend over, a series of large muscles, the erector spinae, pull on your spine to hold you up. Tap image to zoom shows a simplified model of the spine as a rod of length L that pivots at its lower end. In this model, the center of gravity of the 350N weight of the upper torso is at the center of the spine. The 160N weight of the head and arms acts at the top of the spine. The erector spinae muscles are modeled as a single muscle that acts at an 12? angle to the spine. Suppose the person in Tap image to zoom bends over to an angle of 30? from the horizontal. Part A What is the tension in the erector muscle? Hint:Align your x-axis with the axis of the spine. Express your answer to two significant figures and include the appropriate units. T = SubmitGive Up Part B A force from the pelvic girdle acts on the base of the spine. What is the component of this force in the direction of the spine? (This large force is the cause of many back injuries). Express your answer to two significant figures and include the appropriate units. Fp.g. = SubmitGive Up

Explanation / Answer

Torque summation around pivot:

160*L*cos30

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