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## Homework Statement

A child weighing 38 N climbs onto the right

end of a see-saw, little knowing that it is tied

down with a rope at its left end. The see-saw

is 2.6 m long, weighs 12 N and is tilted at an

angle of 17◦ from the horizontal. The center

of mass of the see-saw is half way along its

length, and lies right above the pivot.

1. What torque does the weight of the child

exert about the pivot point? Take counter-

clockwise to be positive. Answer in units of

Nm.

2. What torque does the weight of the see-saw

exert about the pivot point? Take counter-

clockwise to be positive. Answer in units of

Nm.

3. What torque does the rope exert about the

pivot point? Take counter-clockwise to be

positive. Answer in units of Nm.

4. What force does the rope exert downwards on

the see-saw? Give a positive answer. Answer

in units of N.

5. What is the total positive force exerted up-

wards by the pivot? Answer in units of N.