Jeff Beck is a master of manipulating the whammy bar to create expressive, slide and vocal like phrases. This lick may take a bit of practice to get right, but it will be worth it. Start slowly, study the tab and make sure all the fine detail is included. It helps to think of how a slide works in terms of the changes in pitch during a phrase. You can then use this information to emulate the changes in pitch and the vibrato style with the whammy bar instead.