Much of the material making up Saturn’s rings is in the form of tiny dust grains having radii on the order of 10-6m. These grains are located in a region containing a dilute ionized gas, andthey pick up excess electrons. As an approximation, suppose each grain is spherical, with radius R = 1.0 × 10-6m. How many electrons would one grain have to pick up to have a potential of -400 V on its surface (taking V = 0 at infinity)?

How do we measure or think of speed in the united states?

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

How many atoms of nitrogen are in the chemical formula ni(w on