A uniform, 255 N rod that is 1.90 mm long carries a 225 N weight at its right end and an unknown weight W toward the left end (Figure 1). When W is placed 60.0 cmcm from the left end of the rod, the system just balances horizontally when the fulcrum is located 75.0 cmcm from the right end. Find W. Express your answer with the appropriate units.   If W is now moved 20.0 cmcm to the right, how far must the fulcrum be moved to restore balance? Express your answer with the appropriate units.   If W is now moved 20.0 cmcm to the right, in what direction must the fulcrum be moved to restore balance?

The uniform seesaw shown below is balanced on a fulcrum located d1 = 3.5m from the left end. The bigger boy on the left end has a mass m1 =75 kg. The smaller boy on the right end has a mass of m2 = 55 kg and is a distance d2 = 4.5 m from the fulcrum. The mass of the board is mb.    Draw all forces acting on the seesaw board showing their directions and locations. Where would you draw the weight of the board? Identify and show the direction of rotations caused by the torques provided by all forces about the fulcrum. If the seesaw is in static equilibrium, write down the two conditions of static equilibrium symbolically using the forces and distances in the figure. Solve for the mass of the board. Calculate the force of fulcrum on the board.

The uniform solid block in the figure has mass 38.6 kg and edge lengths a = 0.543 m, b = 1.75 m, and c = 0.118 m. Calculate its rotational inertia about an axis through one corner and perpendicular to the large faces. Rotation axis Number i Units

A rectangular bar is hinged at point O.  The bar is 3.00 m long and 2.00 m wide.   Find the torque resulting from the following force about an axis through point O: F1 = 1 N. Use a positive for a counterclockwise torque and a negative for a clockwise torque.

The body in the figure is pivoted at O, and two forces act on it as shown. If r₁ = 2.15 m, r2 = 3.74 m, F₁ = 3.80 N, F₂ = 3.37 N, 0₁ = 65.0°, and 02 = 59.0%, what is the net torque about the pivot? Number i Units

The uniform solid block in the figure has mass 39.8 kg and edge lengths a = 0.902 m, b = 1.67 m, and c = 0.141 m. Calculate its rotational inertia about an axis through one corner and perpendicular to the large faces. Number:   Unit:

Three children are trying to balance on a seesaw.  The seesaw is 4.1 m long and pivots about a rock at its center.  Louie and Laura are already sitting on opposite ends.  If Martha weighs 33 kg, where should she sit so as to balance the seesaw?

The meterstick shown is 100 cm long. It is free to pivot around its center of gravity (CG), which is at the 50 cm mark. There is a 20.0 N block hanging from the 80 cm mark. Decide where each of the other blocks should be placed, one at a time, to balance out the 20.020.0 N block.   At what mark on the meter stick would you place a 16.0 N block to balance the 20.0 N block? At what mark on the meter stick would you place a 42.0 N block to balance the 20.0 N block?