Answer
Ana sarrafa nauyin $P$ ta magudanar ruwa ta $P = k \ lokuta (H_{kyauta} - H_{aiki})$. Duk wani bambanci a cikin tsayin kyauta ($H_{free}$) ko tsayin aikin injina ($H_{aiki}$) yana haifar da canjin layi kai tsaye cikin kaya. A cikin majalisu madaidaici kamar hatimin injina, juriyar juriyar juriya na gidaje, ɓangaren mating, da kuma bazara da kanta dole ne a bincika. Idan haƙurin ya yi sako-sako da yawa, zazzagewar farko na iya saukewa ƙasa da iyakar da ake buƙata don kiyaye hatimi; idan ya yi tsayi sosai, ana iya matse ruwan bazara a kusa da tsayayyen tsayinsa, inda ƙimar bazara $k$ ya zama marar mizani kuma yana da girma sosai saboda tuntuɓar igiyar ruwa zuwa igiyar ruwa. Yawancin injiniyoyi suna amfani da ƙayyadaddun bayanai na 'Load-at- Height' maimakon 'tsawo kyauta' don tabbatar da aiki.
