3. [-/1 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A horizontal beam of length 6 m and mass 7.0 kg has a mass of 4.0 kg and width 0.8 m sitting at the end of the beam (see the following figure). What is the torque due to gravity (in N . m) on the beam-block system about the support at the wall? (Enter the magnitude.) Wall support 0.8 m, 4.0 kg 6 m, 7.0 kg N . m +4. [0/1 Points] DETAILS PREVIOUS ANSWERS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Four particles, one at each of the four corners of a square with 3.0-m-long edges, are connected by massless rods. The masses of the particles are m, = m; = 2.0 kg and my = m = 5.0 kg. Find the moment of inertia of the system about the z axis. x kg . m2 1712 1713 Submit Answer6. [0/6 Points] DETAILS PREVIOUS ANSWERS MY NOTES ASK YOUR TEACHER A uniform cylinder of mass m, and radius R is pivoted on frictionless bearings. A massless string wrapped around the cylinder is connected to a block of mass m, that is on a frictionless incline of angle 0 as shown below. The system is released from rest when the block is at a vertical distance / above the bottom of the incline. (Use any variable or symbol stated above along with the following as necessary: g.) (a) What is the acceleration of the block? a X (b) What is the tension in the string? T = (c) What is the speed of the block as it reaches the bottom of the incline? V = (d) Evaluate your answers for the special case where 0 = 90 and m, = 0. Are your answers what you would expect for this special case? m/s2 T = m/s Explain. (Do this on paper. Your instructor may ask you to turn in this work.) Draw an extended free-body diagram of each object showing the forces acting on the mass and the cylinder. By applying Newton's second law to the cylinder and the block you can obtain simultaneous equations in a, T, and a from which you can express a and T.7. [-/3 Points] DETAILS MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER In the system shown below, there is a block of mass M = 4.2 kg resting on a horizontal ledge. The coefficient of kinetic friction between the ledge and the block is 0.25. The block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging block of mass m = 2.3 kg. The pulley is a uniform disk of radius 8.4 cm and mass 0.55 kg. Find the acceleration of each block and the tensions in the segments of string between each block and the pulley. acceleration m / s 2 tension horizontal vertical IN M TO m