Question

During the descent phase of a barbell squat, a weightlifter starts with a 100 kg barbell on her back, slowly lowers it by a distance of 0.5 m. What is the sign of the work done (if any) by 1) the lifter and 2) gravity A. lifter: positive; gravity: negative B. lifter: negative; gravity: negative C. lifter: negative; gravity: positive D. lifter: positive; gravity: no work done E. lifter: no work done; gravity: negative

          During the descent phase of a barbell squat, a weightlifter starts with a 100 kg barbell on her back, slowly lowers it by a distance of 0.5 m. What is the sign of the work done (if any) by 1) the lifter and 2) gravity
A. lifter: positive; gravity: negative
B. lifter: negative; gravity: negative
C. lifter: negative; gravity: positive
D. lifter: positive; gravity: no work done
E. lifter: no work done; gravity: negative

During the descent phase of a barbell squat, a weightlifter starts with a 100 kg barbell on her back, slowly lowers it by a distance of 0.5 m. What is the sign of the work done (if any) by 1) the lifter and 2) gravity
A. lifter: positive; gravity: negative
B. lifter: negative; gravity: negative
C. lifter: negative; gravity: positive
D. lifter: positive; gravity: no work done
E. lifter: no work done; gravity: negative

Added by Ela A.

Physics for the IB Diploma

K. A. Tsokos 5th Edition

Chapter 2

Instant Answer

Solved by Expert Zack A

03/05/2024

Step 1

Work done by a force is defined as the product of the force applied and the displacement of the object in the direction of the force. Mathematically, it is given by \(W = F \cdot d \cdot \cos(\theta)\), where \(W\) is the work done, \(F\) is the magnitude of the Show more…

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