Need help with Physics. 100 points + Brainliest

1. Two point charges are 10.0 cm apart and have charges of 2.0 µC and –2.0 µC, respectively. What is the magnitude of the electric field at the midpoint between the two charges? (Use G. U.E. S.S.)

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.