Use the following scenario 1-4-
A weightlifter is performing dumbbell biceps curls (see Picture 2) holding a 105 N weight in their hand. The distance from the weight to their elbow is 0.35 m.
A= the relative angle of the elbow = 155-degrees.
B=the relative angle of the elbow = 90-degrees.
C=the relative angle of the elbow = 30-degrees
1. The angle between the line of pull of the biceps and the forearm is 135-degrees when the relative angle of the elbow is 155-degrees(A). What is the torque created by the weight about the elbow?
2. The angle between the line of pull of the biceps and the forearm is 90-degrees when the relative angle of the elbow is 90-degrees(B). What is the torque created by the weight about the elbow?
3. The angle between the line of pull of the biceps and the forearm is 30-degrees when the relative angle of the elbow is 60-degrees(C). What is the torque created by the weight about the elbow?
4. At which relative angle of the elbow will the weightlifter need to more force to hold the weight at that angle?
a. the relative angle of the elbow of 155-degrees
b. the relative angle of the elbow of 90-degrees
c. the relative angle of the elbow of 30-degrees
Use the following scenario for questions 5-7. A discus thrower exerts a torque of 6 Nm on a 2.25 kg discus at an angular velocity of 6.3 rad/sec. The discus has a radius of gyration of 0.10 m. Assume that no other torque or force is acting on the discus than what is provided in this scenario.
5. Calculate the moment of inertia.
6. Calculate the angular acceleration.
7. Calculate the angular momentum.