1a. The above seesaw has a length of 4.00 m.  It is in equilibrium with the people in places as shown.  The clockwise torque is: A. 200 N m B. 600 N m C. 1000 N m D. 1200 N m    1b. The above seesaw has a length of 4.00 m.  It is in equilibrium with the people in places as shown.  The value of x is A. 0.50 m B. 1.00 m C. 1.50 m D. 2.00 m

2. Calculate the moment of inertia of a rectangular plate that is 24.0 cm long and 12.0 cm wide, with a mass of 1.25 kg, a. for an axis of that is perpendicular to the plate passing through its center. b. for an axis along its long edge. c. for an axis along its short edge.

3. A rod with a mass of 10kg and a total length of 2 meters that can spin about an axis through its center ( I = ML2 ) receives a constant force of 5 N on one of its ends. As the rod spins, the 12 force will maintain the same strength and orientation i.e., angled at 60 degrees with respect to the rod. The rod is initially at rest. Total Length Axis 60 deg F, a. How many radians does the rod sweep through after a period of 10 seconds? b. What is the speed of a point on the end of the rod at that same moment?

3. Three forces are applied to a wheel of radius 0.350 m, as shown in the figure. One force is perpendicular to the rim, one is tangent to it and the other one makes a 40° angle with the radius. What is the net torque on the wheel due to three forces for an axis perpendicular to the wheel and pass through its center? Tnet = -0.31 N.m 11.9 N 0.350 m 40.0° 14.6 N 8.50 N

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3. Consider two thin-walled beams of the same wall thickness with cross- sections as shown in Figure 2. Applied torque is the same for both beams. Beams are twisted such that twisting angles are equal to each other. Find the relation between R2 and R₁ for the case = π/3. What will be this relation if we double the center angle o? R₁ R₁ R₂ FIGURE 2. Cross-sections of two thin-walled beams.