Radical 力
7 strokes
slave 奴 (762a) + power 力 (14) = exert oneself 努
努力 (14) nǔlì make great efforts; try hard

They used slave power to build the pyramids — the foremen made sure that the slaves exerted themselves to the full. / Nowadays it’s just a ruin and Teddy sits on it eating his noodles.