A. a person walking on a tight-rope
B. ball on a smooth horizontal table
C. ball resting on an inverted hemisphere bowl
D. ball in the middle of a hemispherical bowl

Correct Answer: Option D

D. ball in the middle of a hemispherical bowl

SEE ALSO  The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.

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