The sun transfers energy to the earth by radiation at a rate of approximately 1 kw per square meter of surface. if this energy could be collected and converted to electrical energy with 25% efficiency, how large an area would be required to collect 5 kw? 1.25 m2 5 m2 20 m2 25 m2

Two charged particles, q1 and q2, are located on the x-axis, with q1 at the origin and q2 initially at x1 = 12.2 mm. in this configuration, q1 exerts a repulsive force of 2.62 µn on q2. particle q2 is then moved to x2 = 18.0 mm. what is the force (magnitude and direction) that q2 exerts on q1 at this new location? (give the magnitude in µn.)