The diagram shows an aluminium sheet of constant thickness. Four significant points on the aluminium sheet are labelled P, Q, R and S.
How can the centre of mass be found?
by finding where a line from P to R crosses a line from S to Q
by suspending the sheet and a plumb-line from Q and finding where the plumb-line crosses a line from P to R
by suspending the sheet and a plumb-line from P and then from S and finding where the plumb-lines cross
by suspending the sheet and a plumb-line from P and finding where the plumb-line crosses a line from S to Q
