Question

Name: 5. Mackenzie, your favorite contestant on a popular last-chance your favorite contestant on a popular weight loss TV show, is in a assists ber image below) at 90 degrees of elbow flexion. Her trainer s hand to support the weight until Mackenzie is ready to hold it all ht while being on the show, you can ignore the mass of her arm workout with her trainer. She is in her right hand (see attempting to hold a 15kg dumbbell Mackenzie's getting into position and exerts a force directly upward underneath herself. Ass so much weight and hand. (10 pts) ume that her biceps is the only active muscle. Because she has lost a. If Mackenzie's bicep can exert a maximum force of 1500N, can she hold the 15kg dumbbell by herself? Explain why or why not Ans: U b. If she can hold the dumbbell by herself use the free body diagram below to compute the biceps muscle force and the magnitude (FJRF) and directio n of the joint reaction force at the elbow that is required to maintain the foream in this static position. Ans: If she cannot hold the dumbbell by herself: calculate how much upward force the trainer must exert on the dumbbell to assist Mackenzie, who is already using all of the available 1500N muscle force. Draw the upward force on the FBD and computer the magnitude (FJRF) and direction of the joint reaction force at the elbow for this static position. Ans:

Answer 1