4 mau laʻana o nā nīnau e hoʻoholo ai i nā ʻāpana wikiwiki mua o ka neʻe parabolic
1. Ua kīkē ʻia ka pōpō ma ke kihi o 60o e kūʻē i ka ʻili o ke kahua. Inā ʻo ka wikiwiki mua (vo) 10 m/s, e hoʻoholo i nā ʻāpana kū pololei a me ka pae ka wikiwiki pōpō mua!
Pahana
Ua ʻike ʻia:
Kihi (θ) = 60o
Ka wikiwiki mua (vo) = 10 m/s
Nīnau ʻia: vox a me voy
Pane:
I loko o kahi alakaʻi e like me ke keleawe, aia nā electrons e neʻe manuahi a me ka random i nā wikiwiki kiʻekiʻe akā ʻaʻole e pakele mai ka metala. ʻO nā electrons e hiki ke neʻe manuahi ua kapa ʻia ʻo free electrons. ʻOiai e neʻe manuahi ana nā electrons i nā ʻaoʻao āpau, ʻaʻohe kahe o nā electrons i kekahi ʻaoʻao. Hana ʻia kēia kūlana ke ʻaʻohe ʻokoʻa hiki ma waena o nā wēlau ʻelua o ke kaula keleawe.
Kahe maoli ka wai mai nā wahi kiʻekiʻe a i nā wahi haʻahaʻa, e like me ka wai ua, nā muliwai, a i ʻole ka wai paipa. Eia naʻe, ʻaʻole hiki i ka wai ke kahe maoli mai nā wahi haʻahaʻa a i nā wahi kiʻekiʻe. No ka laʻana, ʻaʻole hiki i ka wai luawai ke kahe mai ka luawai a i ka waihona wai ma kāna iho, e pono ai ka mana kanaka a i ʻole ka mana mīkini. ʻO ka nui o ka ʻokoʻa o ke kiʻekiʻe ma waena o ka luawai a me ka waihona wai, ʻo ka nui o ka mana e pono ai.
I ke kālaikūlohea , he wai ka wai. He mea hiki ke kahe a noho mālie ka wai . 🙂 ʻO kekahi laʻana o ka wai, ʻo ia ke koko.
Loaʻa i kahi capacitor kahi capacitance kikoʻī. Inā ʻaʻole loaʻa ka capacitance i koi ʻia, hiki ke hoʻopili ʻia ʻelua a ʻoi aku paha nā capacitors e hoʻokō i ka capacitance i koi ʻia. No ka hoʻopili pono ʻana i nā capacitors, he mea nui ka hoʻomaopopo piha ʻana i nā kaapuni capacitor.
Ma mua o ke aʻo ʻana i nā kaapuni capacitor, e hoʻomaopopo mua i nā hōʻailona. 
Eia aʻe. Hōʻike nā laina kū ʻelua i ka hōʻailona capacitor i nā alakaʻi ʻelua i loko o kahi capacitor parallel-plate. I ka hōʻailona pila, hōʻike ka laina kū lōʻihi i ka hiki ke kiʻekiʻe (+) a hōʻike ka laina kū pōkole i ka hiki ke haʻahaʻa (-). Hōʻike nā laina ākea i nā hōʻailona capacitor a me ka pila i nā uea.
Nā mea mālama ikehu uila i loko o nā capacitors
Ua haku ʻia kahi capacitor me ʻelua mau papa/ʻāpana o nā alakaʻi a ma waena o nā alakaʻi ʻelua aia kahi dielectric . I ka wā mua, ʻaʻole i hoʻopiʻi ʻia nā alakaʻi ʻelua me ka uila. I mea e hana ai ka capacitor, pono e hoʻopiʻi ʻia kēlā me kēia papa/ʻāpana o ke alakaʻi me ka uila, kahi like ka nui o ka hoʻopiʻi uila ma kēlā me kēia alakaʻi akā ʻokoʻa nā ʻano. No ka laʻana, he hoʻopiʻi ko kekahi alakaʻi o Q = +10 Coulomb a laila he hoʻopiʻi ko kekahi alakaʻi o Q = -10 Coulomb. ʻO ke alo o ka nui like akā ʻokoʻa nā ʻano o ka hoʻopiʻi uila ma nā alakaʻi ʻelua e hana i kahi kahua uila ma waena o nā papa alakaʻi ʻelua, kahi e hele ai ke kuhikuhi o ke kahua uila mai ka hoʻopiʻi maikaʻi a i ka hoʻopiʻi maikaʻi ʻole. Eia kekahi, kū mai kahi ʻokoʻa hiki ke uila ma waena o nā alakaʻi ʻelua, kahi i loaʻa ai i ke alakaʻi i hoʻopiʻi maikaʻi ʻia kahi hiki ke uila kiʻekiʻe aʻe ʻoiai he haʻahaʻa ka hiki ke uila o ke alakaʻi i hoʻopiʻi maikaʻi ʻole.
Hiki i kahi capacitor ke hana inā ʻaʻole e pā nā papa ʻelua/pepa alakaʻi kekahi i kekahi i ʻole e neʻe ka uku uila mai kekahi alakaʻi a i kekahi. Pēlā nō, i ʻole e neʻe ka uku uila mai ke alakaʻi a i ka lewa, pono ka hakahaka ma waena o nā alakaʻi ʻelua i kahi vacuum. Ma ka ʻatikala e pili ana i nā capacitors papa like, ua kūkākūkā ʻia ka capacitance o kahi capacitor papa like , kahi i hoʻokaʻawale ʻia ai nā papa ʻelua e kahi vacuum. He mau palena ko ka capacitance o kahi capacitor i loko o kahi vacuum, no laila e hoʻonui i ka capacitance, ua kau ʻia kahi dielectric ma waena o nā papa ʻelua/pepa alakaʻi.
ʻO ka capacitor pā like he capacitor i haku ʻia me ʻelua mau pā like a i ʻole nā papa alakaʻi, ʻo kēlā me kēia pā he ʻāpana like (A) a me nā papa ʻelua i hoʻokaʻawale ʻia e kahi mamao (d), e like me ke kiʻi ma ka hema. Ma kēia ʻatikala, e manaʻo ua hoʻokaʻawale ʻia nā papa alakaʻi ʻelua e kahi vacuum. Ma ke kiʻi, ua hoʻopiʻi maikaʻi ʻia kekahi o nā papa alakaʻi (+Q) ʻoiai ua hoʻopiʻi maikaʻi ʻole ʻia kekahi papa alakaʻi (-Q), kahi like ka nui o ka hoʻopiʻi uila ma kēlā me kēia pā.
Hiki i ke aniani liʻiliʻi ke paʻa i kahi wai liʻiliʻi, ʻoiai hiki i ke aniani nui ke paʻa i nā mea hou aku. ʻO ka nui o ke aniani, ʻo ka nui o ka wai e hiki ai ke paʻa. No laila, loaʻa i kēlā me kēia aniani kahi mana, a i ʻole ke ana o kona mana paʻa wai. E like me nā aniani, loaʻa i nā capacitors ka hiki ke mālama i ka uku uila a me ka ikehu hiki ke uila. ʻO ka mana o kahi capacitor, a i ʻole ke ana o kona hiki ke mālama i ka uku uila a me ka ikehu hiki ke uila, ua kapa ʻia ʻo capacitance.
ʻO ka capacitor kahi mea hana e mālama ai i ka hoʻouku uila a me ka ikehu hiki . ʻO ka capacitor maʻalahi he ʻelua mau papa alakaʻi a i ʻole nā pepa i kau ʻia kokoke akā ʻaʻole e pili ana, i hoʻokaʻawale ʻia e kahi insulator a vacuum paha. ʻO ka conductor kahi mea hiki ke alakaʻi i ke au uila, e like me ka metala, ʻoiai ʻo ka insulator kahi mea hiki ʻole ke alakaʻi i ke au uila, e like me ka plastic.
Ua wehewehe ʻia ka hiki ke uila ʻo ia ka ikehu hiki no kēlā me kēia anakahi o ka uku uila . No ka laʻana, i ka wā ma kahi a, loaʻa i ka uku q ka ikehu hiki o EP a , a laila ua hoʻonohonoho ʻia ka hiki ma kahi a penei:
Wehewehena: V = ka hiki ke uila, EP = ikehu hiki ke uila, q = hoʻouku uila.
ʻAʻole wale ʻo V ma ke kiko a akā ma nā kiko āpau o ke kahua uila . Hoʻohana ʻia ke kiko a ma ke ʻano he laʻana. E like me ka mea e wehewehe ʻia ma hope, ʻaʻole hilinaʻi kona waiwai i ka uku q.