Additional Problem (Chapter 6) : Answer
Additional Problem (Chapter 6) : Answer
Additional Problem (Chapter 6) : Answer
A man is sitting in a chair that dangles from a massless rope, which runs over a massless,
frictionless pulley and back down to the man's hand. The combined mass of man and chair is 70.0
kg. Assume the gravitational acceleration as 10 m/s 2.
a) Draw free-body diagrams and discuss the forces on each object, man
and chair.
b) With what force magnitude must the man pull on the rope if he is to
rise with a constant velocity?
Answer
a) The free diagrams for each object are
, where m, M is the mass of the man and the chair, T is the force the man pulls the rope, and N is
the normal force on the man, respectively.
1
T = ( + ) = 350
2
Therefore, man should pull the rope with the force of 350 N.