Question

A 60kg, 185cm male is holding a cable at 45�� pulling 100n, in his right hand. He is holding the cable in a position where his upper arm is 55�� below horizontal and his lower arm 30�� above horizontal. What is the angle between his hand and forearm?

1) 45��
2) 55��
3) 30��
4) Cannot be determined

Answer 1

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).