Allahsays: You acquired the sources of sustenance from the Earth We created. After you have acquired it you do not distribute it according Our measure; you do not spread it according to Our instructions; but you distribute it according to your own laws and systems and, as a consequence, you bring death and destruction.
Later He said -be!- and everything became." Using this saying, mufassir comments that hands clearly means "with his power, without any esbaab (causation) interviening." Moreover, there are other ayah in Qur'an, that mentions hand (s) of Allah (c.c). Such as this one; وَالسَّمَاءَ بَنَيْنَاهَا بِأَيْدٍ
Arock Allah cannot lift is a rock that is based on gravity, mass and weight and ultimately laws of the universe and matter but because Allah is matter-less and shapeless He can just pick it up because these laws cannot apply to Him and if they did Allah would just change the laws. Further more we know the universe in not infinite or isPnXQN.