The maximum size of the overhead bins on the Embraer RJ145 aircraft is approximately 22 inches in width, 14 inches in height, and 9 inches in depth.
I think they are jet aircraft although they have turbofan engines. You can check more on thee link below
It is 5187 kg, but it depends on the type of 145.
About 50, depending on the airline and the exact model of aircraft.
The RJ (or ERJ) 145 is a jet built by the Brazilian company Embraer for use on regional air routes. The ERJ is operated by the following airlines: AeroMexico Connect Alitalia Express Flybe Bmi Regional LOT Polish Airlines Luxair PGA-Portugalia Air France Regional American Eagle Airlines Chautauqua Airlines ExpressJet Airlines Freedom Airlines Trans States Airlines Other smaller carriers A typical layout for the ERJ 145 (ExpressJet layout) has three rows of seats. The aircraft has three seats across its width with a walkway between the first and second row of seats. The aircraft also has a Lavatory in the back and galley space near the front. References http://en.wikipedia.org/wiki/Embraer_145 http://www.seatguru.com/airlines/ExpressJet/ExpressJet_Embraer_ERJ-145.php
As of October 2013, it is row 12. However, it looks like it is changing to row 18 in the near future (rows have been renumbered?)