The card will probably work with a D7000. Class 10 indicates read/write speed. It won't hurt the camera so try it and see. If you haven't bought a card yet this page shows which cards Nikon has tested and know works with the D7000, but other cards work too, they just haven't tested them.
support.nikonusa.com/app/answers/detail/a_id/17061/~/approved-memory-cards---d7000
27.3 oz./774g/1.70625 pounds with battery, strap rings and card (according to Ken Rockwell)
Yes it is. I use this card with a D300 myself.
Yes
The 4100 takes an SD card. We suggest a high speed card.
There are Wi-Fi memory cards for sale that are compatible with the Nikon Coolpix L 22. These memory cards can be purchased preformatted to ensure compatibility.
YEs
SD
SD
What you need to be compatible with a new graphics card depends on the card and the computer and operating system.
Battery and memory card installed?
it depends, all mobos should be compatible with ur graphics card but definitely if the grafix card is integrated in to the mobo lol
a sound card