R The mass is m, small top radius r and large bottom radius R and height is h. Find: a. The moment of inertia about the horizontal axis through the top base with radius r. b. The moment of inertia about the horizontal axis through the bottom base with radius R. c. The moment of inertia about the horizontal axis through the center of mass. h(R² + 2Rr +3r²) 4(R² +rR+ p²) Note that the center of mass is given by:
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The moment of inertia of a conical section with mass m be defined as,
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- z [meters] mc 6 kg MB 11 kg -5 10 x [meters] 100 kg MA -5- Calculate the moment of inertia about the z-axis for a group of point masses (see Figure). Mass A = 100 kg, mass B = 11 kg, massC = 6 kg and mass D = 8.8 kg. (PUHQ0239) %3D %3D a) 03.88 x 10 kg m2 3 b) O-9.18 x 10 2 kg m2 c) 04.08 x 10 kg m² 3 2 d) 03.65 x 10 3 kg m?1. Find the expression for the moment of inertia of a uniform, solid disk of mass M and radius R, rotated about an axis that goes through its center as shown in the diagram below. Hint: the moment of inertia of a thin ring is given by MR2. Divide the disk into a series of rings of radius r, mass dm, and thickness dr, then integrate over the rings. Your expression should only depend on the variables M and R. 99+Two barbells are sitting on the floor at the RWC. Both consist of a 10 kg bar with length 1.5 m, and two 25 kg plates. On the first barbell, both plates are located at the same end of the bar, while on the second barbell they are located at opposite ends. Which barbell has a larger moment of inertia? A The barbell with both weights at the same end B The barbell with the two weights located at opposite ends C Both have the same moment of inertia D Neither bar bell has a moment of inertia, since they aren't rotating E There isn't enough information to tell, since the moment of inertia depends on the choice of rotational axis
- A bicycle wheel of mass M (all at the edges) and radius r is fixed about an axis through its center and is initially at rest. You wrap the wheel with a cord and attach a hanging weight of mass m to the cord. You release the weight and allow it to fall a distance d. The weight falls smoothly, and the cord does not slip over the wheel as it unwinds. a. (Write an expression for the angular acceleration α of the wheel in terms of the tension T of the cord.b. Write an expression for the linear acceleration a of the weight in terms of the tension T of the cord.c. (Using parts (a) and (b) find the linear acceleration in terms of M, m, and g.d. Write an expression for the linear speed v of the weight after it falls a distance d.e. For M = 7.5 kg, r = 33 cm, m = 250 g, and d = 1.5 m, what is the rotational kinetic energy of the wheel afterthe weight has fallen?A reasonable estimate of the moment of inertia of an ice skater spinning with her arms at her sides can be made by modeling most of her body as a uniform cylinder. Suppose the skater has a mass of 64 kg. One-eighth of that mass is in her arms, which are 60 cm long and 20 cm from the vertical axis about which she rotates. The rest of her mass is approximately in the form of a 20-cm-radius cylinder. a. Estimate the skater’s moment of inertia to two significant figures.b. If she were to hold her arms outward, rather than at her sides, would her moment of inertia increase, decrease, or remain unchanged? Explain.The radius of a park merry-go-round is 2.5 m. To start it rotating, you wrap a rope around it and pull with a force of 260 N for 20 s. During this time, the merry-go-round makes one complete rotation. (a) Find the angular acceleration of the merry-go-round. rad/s2 (b) What is the magnitude of the torque exerted by the rope on the merry-go-round? N-m (c) What is the moment of inertia of the merry-go-round? kg-m2 eBook
- A wheel (radius = 0.25 m) is mounted on a frictionless, horizontal axis. The moment of inertia of the wheel about the axis is 0.040 kg x m². A light cord wrapped around the wheel supports a 0.50-kg object as shown in the figure. The object is released from rest. What is the magnitude of the acceleration of the 0.50-kg object? 3.0 m/s² 3.4 m/s² 4.3 m/s² 3.8 m/s² 2.7 m/s²The member shown below is fixed at O and its dimensions are h1 = 1.10 m, h2= 0.20 m, and w = 0.50 m A force F of magnitude F=40 N is applied at point A. Determine the magnitude of the moment of the force about point O.Let's calculate the moment of inertia for a rotating rod. The general definition for the moment of inertia is I = fr²dm Let's suppose we have a uniform rod of length R with mass M, then our line density is M where we have ignored the thickness of the rod to simplify the problem. Density is an intrinsic variable, meaning that it is a constant and doesn't change for varying lengths; thus we can rephrase this equation in terms of the measured infinitesimals as dm = A dr %3D As a reminder, the r in our moment of inertia definition is the distance from the rotating axis to the mass, so rotating about the edge of rod will yield a different result than if we rotated about the middle of the rod. Let's do the latter example here and save the former as an exercise for you to do. If we rotate the rod through the center, then our integration limits become -R/2 to R/2, +R/2 |+R/2 1 dr = 1 AR3 12 Irod R/2 -R/2
- The axis of rotation of a thin plate is located at the left side, as shown in the figure. Calculate the moment of inertia I if the plate has a length L of 9.00 cm, a width w of 7.00 cm, and a uniform mass density of 2.50 g/cm². I = kg.m² W LA thin hoop of radius 2.00 cm and mass 0.0300 kg rolls down a frictionless ramp of length 4.00 m that makes an angle of 10.0° with the horizontal. The hoop starts from rest from the top of the ramp.a. Find the angular speed of the hoop at the bottom of the ramp.b. After the hoop rolls off the ramp, it is traveling along a horizontal surface with friction that causes a frictional torque of magnitude 0.400 N·m on the hoop. How much time will it take for the hoop to come to rest?12. A person of mass 82.0 kg is riding a ferris wheel of radius 13.5 m. The wheel is spinning at a constant angular speed of 1.80 rpm. Determine the force exerted on the rider by the seat at the top of the ferris wheel. N