Three point masses ma, mB and mc are located in the x-y plane at points A, B and C as shown in Figure They are connected together by massless rods. Find the kinetic energy of the system if it rotates with an angular speed of 4.0 rad/s about the z-axis passing through point A. Fig# y mg = 0.10 kg 0.30 m 0.40 m A m, = 0.30 kg mc = 0.20 kg A) 0.46 J В) 0.69 J C) 0.21 J D) 1.2 J E) 2.5 J

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Angular speed, acceleration and displacement

Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.

Angular Position

Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.