A massless rod supports a 1000 N block on a massless string. A scale is placed halfway between the pivot point of the rod and the string. What does the scale read? Choice 1 of 7:500 NChoice 2 of 7:1000 NChoice 3 of 7:1333 NChoice 4 of 7:1500 NChoice 5 of 7:2000 NChoice 6 of 7:3000 NChoice 7 of 7:4000 N