1 1/2 x 3 1/2
1 3/8" x 3 5/8"
1.5" x 7.5"
2x4
a normal 2X4 weights between 8 to 10 pounds
A 2X4 would be a stud, not a board. Weight depends on the length and species, if it is pressure treated or not. 8ft. hem-fir 2X4 is about 8 pounds or so.
no
1 1/2 would be about maximum, making sure it is centered and you use metal protectors on the edges of the stud to keep nails from penetrating.
You will need at least 13-9' 2x4's, on 16" centers, and 2-16' 2x4's for plates. (Deduct plate thickness from stud length)
The color identifies them as "stud grade" pine.
1 and a half inches by 3 and a half inches. Note that an "8 foot 2x4" is 8x12" = 96" long, but a "2x4 stud" is 92 5/8" long to allow for bottom and top plates to make wall framing go quicker.
A 2x4 is still 2x4- UNTIL it is run thru a planning machine. The planer removes about a quarter inch from each face, giving a DRESSED dimension of 1.5 x 3.5. However, undressed (means rough cut, unplaned) lumber is still 2x4.
That dimension will change with the size of the window and the header height.
Install in the most convenient "hole" (knockout) to the wires that are being run.
Type your answer here... so the end result is a 8' (eight foot) ceiling height, taking consideration for flooring and ceiling material.
What gauge metal is most used in interior applications