Two cars approach a street corner at right angles to each
other (see the figure(Figure 1)). Car 1 travels at a speed
relative to Earth V1E = 35 km/h, and car 2 at V2E = 59
km/h

What is the velocity directions of car2 relative to Car1 with angle south of east

the angle is given by

Tan theta = 35/59 = 0.59

so theta = Tan ^-1 ( 0.59 )

theta = 30.54 deg.

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.

1/0.14nm = 10^10/1.4 a lot