1. A uniform rod of length 4 m and of weight 5 N is supported at its extreme right end by a fulcrum as shown. A block of weight W = 10 N is sitting 1 m from the fulcrum. An upward force F is applied at the extreme left end.
What is the force F needed to keep the system in static equilibrium?
(b) 40 N
(c) 5 N
(d) 2.5 N
(e) 7.5 N
2. Now suppose that the fulcrum is moved directly under the block. Compared to your previous answer, the force needed to keep the system in static equilibrium will be
(a) greater.
(b) less.
(c) the same.
3. What is the angular velocity of the second hand of a clock?
(a) 0.105 rad/s
(b) 22.7 rad/s
(c) 360 rad/s
