Acharge q= 2 c is distributed uniformly through out a bar of length l=2.5 m. the bar is placed horizontally in free space. a second charge q = 10−9c is placed along the line of the bar a distance d= 2m away in space, measured from the right end of the bar. what force is exerted on charge q by the charged bar?

If steel is more dense that lake water, why can a boat float

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.