Answer to Question #271290 in Physics for grey tyrant

Question

A weightlifter holds a 100kg barbell stationary in the air. While they are

holding up the barbell, what is the value of the work they are exerting?

A. Positive C. Zero / No value

B. Negative D. Can’t be determined

Answer 1

By definition, the mechanical work of some work on some body is the scalar product of this force and displacement of this body. Since in this problem the neither wightlifter, nor barbell move, the displacement is zero and, thus, the work is zero as well.

Answer. C. Zero / No value.