You have a bar of vibranium and the Cap needs to use it (not used up or consumed) every day but he only needs 1/7th on the first day, 2/7th on the second day and so on for 7 days.
You have a vibranium knife that can cut through it for the Cap; however the knife is only good to make 2 cuts. You are very good and can cut perfectly.
How can you cut the vibranium bar into 3 pieces so that the Cap can get the perfect amount of vibranium for each day from 1 to 7?