Report

READING QUIZ The center of gravity is a point locating the resultant weight of a system of particles. A) True B) False READING QUIZ ~ The integral x dA for a 2-D body in the x-y plane is called the ______ . A) first moment of area about x-axis B) first moment of area about y-axis C) second moment of area about x-axis D) second moment of area about y-axis CONCEPT QUIZ The centroid and center of mass of a thin plate always coincide. A) True B) False CONCEPT QUIZ To find the location of the centroid of the shaded area, it is best to choose a ___ . y y = x A) horizontal rectangular element 2 B) vertical rectangular element C) square element D) triangular (polar) element 4 x ATTENTION QUIZ To locate the center of mass of the homogeneous solid volume shown, a disk element is used for integration. The differential volume of the disk is ______ . 3/2 y = x y A) dv = x3 dx B) dv = y3 dx ½ C) dv = x6 dx x D) dv = (/4)x6 dx dv ATTENTION QUIZ A uniform semicircular rod of mass M and radius R is supported by a hinge at its upper end and is free to swing in the vertical plane. Which of the following is true about the force reaction components, Ox and Oy , at O? A) Ox = M g B) Oy = M R C) Oy = 0 D) Ox = 0 O • • C