Nā Pūnaewele Gurumuda
Nā kuʻi - nā pilikia a me nā hoʻonā
1. Neʻe ka mea A (3 kg) ma ka wikiwiki o 8 m/s a neʻe ka mea B (5 kg) ma ka wikiwiki o 4 m/s. Inā he elastic kūpono ke kuʻi ʻana ma waena o nā mea A a me B, he aha ka wikiwiki o nā mea A a me B ma hope o ke kuʻi ʻana?
ʻIke ʻia:
Ka nuipa o ka mea A (m1 ) = 3 kg
Ka nuipa o ka mea B (m2 ) = 5 kg
ʻO ka wikiwiki o ka mea A (v 1 ) = 8 ms –1
ʻO ka wikiwiki o ka mea B (v 2 ) = 4 ms –1
Nā vectors unit - nā pilikia a me nā hoʻonā
1. Neʻe kekahi mea ma ka wikiwiki o v = (2i − 1.5j) m/s. He aha ka neʻe ʻana o ka mea ma hope o 4 kekona?
ʻIke ʻia:
ʻO ka ʻāpana pae o ka wikiwiki (v x ) = 2 m/s
ʻO ka ʻāpana kū pololei o ka wikiwiki (v y ) = 1.5 m/s
Ka manawa (t) = 4 kekona
Makemake ʻia: Hoʻoneʻe ʻana
Ka neʻe ʻana o Vector - nā pilikia a me nā hoʻonā
1. Hele kekahi kanaka mai kahi A a i kahi B, 600 mika ma ka ʻākau; a laila i kahi C, 400 mika ma ke komohana; a laila i kahi D, 200 mika ma ka hema; a laila hoʻopau ma kahi E, 700 mika ma ka hikina. He aha ka nui o ka neʻe ʻana?
Lōlā:
ʻIke ʻia:
AF = AB – BF = AB – CD = 600 – 200 = 400 m
EF = DE – DF = DE – BC = 700 – 400 = 300 m
Hoʻohui i nā vectors me ka hoʻohana ʻana i nā ʻāpana - nā pilikia a me nā hoʻonā
1. ʻEkolu mau vectors e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei.
V1 = 30
V 2 = 30
V 3 = 40
He aha nā vectors hopena?
ʻIke ʻia:
V 1 = 30, kihi ma waena o V 1 a me ke axis x = 30 o
Nā kiʻi o ka neʻe linear - nā pilikia a me nā hoʻonā
1. Ka mamao o ke kiʻi (kū) e kūʻē i ka manawa (moemoeā) e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei. He mea e hoʻomaha ana i hōʻike ʻia e ka helu…
Lōlā:
Helu 3, i hōʻike ʻia e kahi laina pololei.
ʻO ka wikiwiki awelika - nā pilikia a me nā hoʻonā
1. Hoʻopuni kekahi i kahi huinahā me ka lōʻihi o 400 m a me ka laulā o 100 m, 12 mau manawa i loko o 1 hola. He aha ka wikiwiki awelika a me ka wikiwiki awelika?
ʻIke ʻia:
Ka lōʻihi o ka huinahā = 400 mika
Ka laulā o ka huinahā = 100 mika
Ka pōʻai o ka huinahā = (2 x 400 mika) + (2 x 100 mika) = 800 mika + 200 mika = 1000 mika
Ka mamao = 12 x 1000 mika = 12,000 mika = 12 kilomita
27 Ka neʻe ʻana o ka pōkā - nā pilikia a me nā hoʻonā 1. Ua pana ʻia kahi pōkā ma kahi kihi θ = 60o me ka wikiwiki o 20 m/s. ʻO ka wikiwiki ma muli o ke koʻikoʻi he 10 m/s2. He aha ka manawa e hiki ai i ke kiʻekiʻe loa? ʻIke ʻia: ʻO ka wikiwiki mua o ka pōkā (vo) = 20 m/s Angle (θ) = 60oC … E heluhelu hou aku
Kumumanaʻo ʻeleʻele - nā pilikia a me nā hoʻonā
1. 200-gram wai ma 30°C i hui pū ʻia me 100-gram wai ma 90°C. ʻO ka wela kikoʻī o ka wai = 1 cal.gram −1 °C −1 . E hoʻoholo i ka mahana hope loa o ka hui ʻana!
ʻIke ʻia:
Ka nui o ka wai 2 (m1 ) = 200 grams
Mahana o ka wai 1 (T 1 ) = 30 o C
Ka nui o ka wai 2 (m 2 ) = 100 grams
10 Dynamics Object i hoʻopili ʻia e ke kaula ma luna o ka pulley Atwood machine - Nā pilikia a me nā hoʻonā
1. ʻO ka poloka A me ke kaumaha o 5 kg, i kau ʻia ma luna o kahi mokulele pālahalaha laumania. ʻO ka poloka B me ke kaumaha o 3 kg e kau ana ma kekahi wēlau o ke kaula i hoʻopili ʻia me ka poloka A ma luna o kahi pulley. ʻO ka wikiwiki ma muli o ke koʻikoʻi he 10 m/s 2. He aha ka wikiwiki o nā poloka ʻelua?
ʻIke ʻia:
Ka nuipa o ka poloka A (mA) = 5 kg
Ka nuipa o ka poloka B (m B ) = 3 kg
Ka wikiwiki ma muli o ke koʻikoʻi (g) = 10 m/s 2
Neʻe pōʻai - nā pilikia a me nā hoʻonā
1. Neʻe kahi mea he 10-kg i loko o kahi pōʻai ma ka wikiwiki mau o 4 m/s. Inā he 0.5 mika ka radius o ka pōʻai, a laila:
1) ʻO ke alapine (frequency) o nā pōʻai he 4/π Hz
2) ʻO ka wikiwiki centripetal he 32 ms -2
3) ʻO ka ikaika centripetal he 320 N
4) ʻO ka wā he 4π s.
ʻO wai nā ʻōlelo ʻoiaʻiʻo?