An athlete with mass 70 kg trains by performing press-ups with a load on his back. The diagram shows the perpendicular distances involved.
The centre of mass of the athlete is CM and the centre of mass of the load he is carrying is CL.
The mass of the load is 6.0 kg.
What is the upward force exerted by his two arms?
A. 54N
B. 76N
C. 540N
D. 760N
SOLUTION:
- Identify pivot as foot
- At equilibrium, Anticlockwise Moment = Clockwise Moment
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