Kua pātai koe, He aha ngā mea totoka e mānu ai i runga i te mata o te wai? Ka maka e koe te kōka ki roto i te wai, ā, ka mānu te kōka. I tētahi atu taha, ki te maka e koe he ngira tuitui, he kōhatu rānei ki roto i te wai, ka totohu te ngira tuitui, te kōhatu rānei, ahakoa he iti ake te rahi o te ngira, o te kōhatu rānei i te kōka. He aha ngā āhuatanga e mānu ai te mea totoka i runga i te mata o te wai?
Ka pā te kaha ā-papa o te whenua ki ngā mea katoa i runga i te mata o te whenua, nō reira, he kaha ā-papa tō ia mea he papatipu tōna. Mēnā he iti ake te kaha taumaha (w) o tētahi mea totoka i te kaha pōrewarewa (F A ) o te wai, kāti, ina rumakina te mea totoka ki roto i te wai, ka neke ake te mea ka mānu i runga i te mata o te wai.
Ka neke ake ngā mea, ka mānu i runga i te mata o te wai nā te mea he kaha katoa, he kaha hua rānei e anga whakarunga ana ki runga e pā ana ki te mea, ko te rahi o te kaha katoa = te kaha pōrewarewa – te kaha ā-papatipu.
Whakaahuatanga: ρ = kiato papatipu, g = whakaterenga ā-papatipu, Vahanoa = te rōrahi o tētahi mea e rumakina ana ki te wai (ka rumakina ngā wāhanga katoa o te mea ki te wai), P = te pēhanga, A = te horahanga o te mata, m = te papatipu o te mea.
I runga i tēnei whārite, ka taea te whakatau ko te ahunga o te nekehanga o tētahi mea e rumakina ana ki te wai ka pāngia anake e te mātotoru o te mea me te mātotoru o te wai. Mena he nui ake te mātotoru o te wai i te mātotoru o te mea, ka neke ake te mea i muri i te rumakina ki te wai (ka mānu te mea).
Ina mānu te mea i runga i te mata o te wai, me rite te kaha o te pōtae ki te kaha o te taumaha o te mea, kia kore ai te kaha e puta mai, ā, kia noho taurite tonu te mea (kei te okioki te mea).
Whakaahuatanga: ρ = kiato, v 1 = rōrahi o te mea e rumakina ana ki te wai, v 2 = rōrahi katoa o te mea
Ina mānu te mea i runga i te mata o te wai, ka whakatauhia te rōrahi o te mea kua rukuhia ki te wai e te rōrahi o te mea me te ōwehenga o te mātotoru o te wai ki te mātotoru o te mea. Mena ka mānu te mea i runga i te mata o tētahi wai ehara i te wai, ka whakakapia te mātotoru o te wai e te mātotoru o te wai.
