rachelmaddie
Full Member
- Joined
- Aug 30, 2019
- Messages
- 851
Hi. I need my work checked please.

Torque is defined as T = r + F where r is the position vector of the point where the force is applied with respect to the point of rotation and F is the force vector.
Tamara’s forearm is 0.366 meters long so the force is being applied at a distance of 0.366 m from the point of rotation (her elbow). Her elbow is bent at an angle of 15° below the horizontal.
Another way to write it is the product of the radius and force magnitude * sine of the angle between vectors.
T = rF sin theta
where r = 0.366 meters and F = 155 Newtons. F is in the +y direction and r is below the +x axis, so the angle between vectors is 90° - 15° = 75°.
T = (0.366 m) (155 N) (sin 75°)
T = 54.8 N•m
54.8 N•m in the direction of the negative y-axis

Torque is defined as T = r + F where r is the position vector of the point where the force is applied with respect to the point of rotation and F is the force vector.
Tamara’s forearm is 0.366 meters long so the force is being applied at a distance of 0.366 m from the point of rotation (her elbow). Her elbow is bent at an angle of 15° below the horizontal.
Another way to write it is the product of the radius and force magnitude * sine of the angle between vectors.
T = rF sin theta
where r = 0.366 meters and F = 155 Newtons. F is in the +y direction and r is below the +x axis, so the angle between vectors is 90° - 15° = 75°.
T = (0.366 m) (155 N) (sin 75°)
T = 54.8 N•m
54.8 N•m in the direction of the negative y-axis