1. A meter stick of negligible mass is placed on a fulcrum (a pivot point) at the 0.60 m mark, with a 2.0 kg mass hung at the 0 m mark and a 1.0 kg mass hung at the 1.0 m mark. The meter stick is released from rest in a horizontal position. Immediately after release, what is the magnitude of the net torque on the meter stick about the fulcrum?

5. A meter stick is supported at each side by a spring scale. A heavy mass is then hung on the meterstick so that the spring scale on the left hand side reads four times the value of the spring scale on the right hand side. If the mass of the meterstick is negligible compared to the hanging mass, how far from the right hand side is the large mass hanging?

(A) 25 cm (B) 67 cm (C) 75 cm (D) 80 cm

7. A massless rigid rod of length 3dis pivoted at a fixed pointW, and two forces each of magnitudeFare applied vertically upward as shown. A third vertical force of magnitudeFmay be applied, either upward or downward, at one of the labeled points. With the proper choice of direction at each point, the rod can be in equilibrium if the third force of magnitudeFis applied at point

(A)Yonly (B)VorXonly (C)VorYonly (D)V, W,orX

30 450\f