1in the computation of percentage error the reference is a s

1-in the computation of percentage error the reference is a standard value in the computation of the percentage difference is -----------.

2-the conditions for mechanical equilibrium are-------------and-----------.

3-the physical quantities required for systematic study of mechanics can be expressed in terms of---------------.

Solution

1)Percentage error is the ratio of difference of standard to aproximate value to standard value

2)SUM OF ALL THE FORCES ARE EQUAL TO ZERO AND SUM OF ALL THE MOMENTS ARE ALSO EQUAL TO ZERO.

3)VECTORS and scalors