A body shown in figure 2 below consists of 2 parts. Part A is 0.75 the thickness of Part B. Part A has twice the density of Part B. There are 2 rectangle cut out 0.1m from the edges. (i)Find the centre of gravity? (ii)What would be the density of Part A as a % of Part B, for the CoG to be on the line y-y? Hint: Centroid of a semicircle is 4r/3T 5m 2.5m 0.5m 1m I Part A Part B I 2.5m JY Figure 2 I

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.