A box fan might be a safer alternative. It'd give you the ability to move it around but not the high rpm of a angle grinder.
Or maybe some safer things too - place it on a record on a turntable and film the face of the DJ doing some mixing?
Seems like strapping an iPhone to an angle grinder is getting close to answering the stated question...
Take a blender, remove the blades, put iPhones on the spindle where the blades were. Now fire up the blender and throw in some fruits. Will iPhones spinning at $whatever RPMs be able to turn your fruits and wheat grass into a delicious smoothie?
The original is actually "Will It Be Blended [by this blender]". I want to know "Will It Make a Suitable Replacement for a Blender".