From a set of graphed data the slope of the best fit line is found to be 1.35 m/s and the slope of the worst fit line is 1.29m/s. determine the uncertainty for the slope of the line.

Solution:

Let the slope of the best fit line be represented by ''

and the slope of the worst fit line be represented by ''

Given that:

= 1.35 m/s

= 1.29 m/s

Then the uncertainity in the slope of the line is given by the formula:

              (1)

Substituting values in eqn (1), we get

= 0.03 m/s

answer: 0.20

explanation: this can only be the answew because all the other measuremnets are not close

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.