Q1. A space station, in the form of a wheel 184 m in diameter, rotates to provide an "artificial gravity" of 7.40 m/s2 for persons who walk around on the outer rim. Find the rotational frequency of wheel (in revolutions per minute) that will produce this effect.
Q2. Two small insulating spheres with radius 8.50×10^-2 are separated by a large center-to-center distance of 0.480. One sphere is negatively charged, with net charge -2.20 mu C, and the other sphere is positively charged, with net charge 3.20 mu C. The charge is uniformly distributed within volume of each sphere. What is the magnitude E of electric field midway between the spheres?