An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 68.7 cm long and has a mass of 4.69 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?

Answer 1

Looking at the ball and his arm, and assuming the mass of the arm is at the center of the arm...

torque=massball*length + massarm*length/2

Answer 2

Should the lenght be in centimetres or metres and the mass of the ball in kilograms?

Answer 3

Normally, it does not matter if you place units on your answer. Standard form is n-meters.

Answer 4

What is the magnitude of the torque about his shoulder if he holds his arm straight, but 46.6° below horizontal?

Answer 5

gOOD QUESTION
i would think it would be,
torque=massball*length*sin46.6 + massarm*length/2cos*46.6