A Styrofoam ball with a charge of -1.00 x 10-6 C experiences an upward force of 0.0200 N in an electric field. What is that electric field

Gunpowder residue is most likely to show up where on a shooters hands

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?