Google Nexus 7 cable & Apple iPhone plug?

Will the two work together to power a Nexus 7 as they are both USB?

Possibly. You should check the voltage & current requirements for the Nexus 7 though.

Apple chargers provide 5W, 10W or 12W of power at 5 volts depending on which model it is. It will tell you on the underside which model you have.

The Nexus 7 may need a higher power rating for charging. If it does you'll find it charges really slow with this plug.