John’s mass is 95.6 kg, and barbara’s is 55.3 kg. he is standing on the x axis at xj = +10.9 m, while she is standing on the x axis at xb = +2.50 m. they switch positions. how far and in which direction does their center of mass move as a result of the switch? distance moved by center of mass =

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward