1. How do I list all the users in a specific group?

2. I am checking the size of ram but is only getting the first modul, not the second one.
Using this script:
$objMemory = $objwinmgmts.InstancesOf("Win32_PhysicalMemory")
$count = 0
For each $module in $objMemory
$count = $count + 1
"The memory size of module " + $count + " is " + (Val($module.Capacity)/1048576) + " Megabytes." ?
"There are " + $count + " memory modules installed." ?