Final answer:
To find the angle between the hand and forearm, the difference between the angle of the upper arm (125° from the positive horizontal axis) and the lower arm (30° above horizontal) is calculated as 95°. However, since this answer is not among the provided options, the response is 'Cannot be determined.'
Step-by-step explanation:
The question involves determining the angle between a person's hand and forearm when holding a cable, given the angles of the upper arm and lower arm in relation to a horizontal plane.
To find the angle between the hand and forearm, we consider that the upper arm is 55° below horizontal and the lower arm is 30° above horizontal. Visually, if you imagine the horizontal line being at 0 degrees, then the upper arm makes a 125-degree angle with respect to the positive horizontal axis (180 - 55), and the lower arm makes a 30-degree angle above the horizontal. The angle between the hand and forearm is thus the difference between those two angles.
Therefore, the angle between the hand and forearm is 125° - 30° = 95°. However, none of the provided answer options (45°, 55°, 30°) match this calculation, which means that the correct response based on the given options would be Cannot be determined (option 4).