7 mau nīnau ʻoihana
1. E nānā i ke kiʻi ma lalo nei!
ʻO ka nui o ka hana i hana ʻia ma ka poloka he ...
A. 3 Joule
B. 8 Joule
C. 16 Joule
D. 48 Joule
Pahana
Ua ʻike ʻia:
Ikaika (F) = 12 Newtons
Ka neʻe ʻana (s) = 4 mika
Nīnau ʻia: Hoʻoikaika (W)
Pane:
Ma ke kiʻi ma luna, ua like ke kuhikuhi o ka neʻe ʻana o ka mea me ka ikaika. ʻO ke ʻano hana no kēia hihia:
W = Fs = (12 Newton)(4 mika) = 48 Newton mika = 48 Joules
ʻO D ka pane pololei.
2. Ua paʻi ʻia kahi poloka lāʻau me ka ikaika o 200 N i neʻe ai i kahi mamao o 2 m, ʻo ka hana i hana ʻia e ka poloka lāʻau he...
A. 20 J
B. 100 J
C. 200 J
D. 400 J
Pahana
Ua ʻike ʻia:
Ikaika (F) = 200 Newtons
Ka neʻe ʻana (s) = 2 mika
Nīnau ʻia: Hoʻoikaika (W)
Pane:
ʻOihana:
W = Fs
W = (200 Newton) (2 mika)
W = 400 mika Newton
W = 400 Joule
ʻO D ka pane pololei.
3. E nānā i ke kiʻi!
Makemake kekahi mea hoʻokele kaʻa sedan e hoʻokū i kāna kaʻa ma kahi o 0,5 m ma mua o kahi kalaka i kū mua ma kahi o 10 m mai ke kaʻa sedan. Pehea ka nui o ka ikaika e pono ai no ke kaʻa sedan?
A. 525 J
B. 500 J
C. 495 J
D. 475 J
Pahana
Ua ʻike ʻia:
Ka neʻe ʻana (s) = 10 mika – 0,5 mika = 9,5 mika
Ikaika (F) = 50 Newtons
Nīnau ʻia: Hoʻoikaika (W)
Pane:
ʻAno hana pāʻoihana:
W = Fs
W = (50 Newton) (9,5 mika)
W = 475 mika Newton
W = 475 Joule
ʻO D ka pane pololei.
4. E nānā i ke kiʻi!
ʻO ka nui o ka hoʻoikaika a Andi lāua ʻo Toni e hoʻoneʻe i ke kaʻa i 4 mika inā he 50 N a me 70 N nā ikaika o nā keiki ʻelua...
A. 80 joules
B. 200 joules
C. 280 joules
D. 480 joules
Pahana
Ua ʻike ʻia:
Ka neʻe ʻana (s) = 4 mika
Ka ikaika hopena (F) = 50 Newtons + 70 Newtons = 120 Newtons
Nīnau ʻia: Hoʻoikaika (W)
Pane:
ʻOihana:
W = Fs = (120 Newton)(4 mika) = 480 Newton mika = 480 Joules
ʻO D ka pane pololei.
5. Huki kekahi mea hoʻokele i kahi kaʻa kū e like me ka mea i hōʻike ʻia ma ke kiʻi, i neʻe ai ke kaʻa i kahi mamao o 1.000 cm. ʻO ka nui o ka hana i hana ʻia…..
A. 250 Joule
B. 1.000 Joule
C. 2.500 Joule
D. 250.000 Joule
Pahana
Ua ʻike ʻia:
E hōʻike i nā ʻāpana āpau o ka ʻōnaehana honua
Ikaika (F) = 250 Newtons
Ka neʻe ʻana (s) = 1000 kenimika = 1000/100 mika = 10 mika
Nīnau: Ka nui o ka hoʻoikaika (W)
Pane:
ʻAno hana pāʻoihana:
W = Fs = (250 Newton)(10 mika) = 2500 Newton mika = 2500 Joules
ʻO C ka pane pololei.
6. E nānā i ke kiʻi ma lalo nei o ka neʻe ʻana o nā mea!
Inā he 375 Joules ka hana i hana ʻia e kēia mau ikaika ma luna o kahi mea, hiki i ka mea ke neʻe i kahi mamao ...
A. 7,5 mika
B. 15 mika
C. 22,5 mika
D. 25 mika
Pahana
Ua ʻike ʻia:
Hana (W) = 375 Joules
Ka ikaika hopena ( ΣF) = 40 N + 10 N – 25 N = 25 Newtons (ma ka ʻākau)
Nīnau ʻia: Ka hoʻoneʻe ʻana
Pane:
ʻAno hana pāʻoihana:
W = Fs
Ka hoʻoneʻe ʻana:
s = W / F = 375 Joules / 25 Newtons
s = 15 mika
ʻO ka pane pololei ʻo B.
7. ʻO nā hana a kekahi o nā keiki ma lalo nei ʻaʻole e pili ana i ka hana ʻoihana ʻo ia hoʻi...
A. e paʻi ana i ke kaʻa ʻiʻo pōpō he 10 mika
B. e paʻi ana i kahi kaʻa kū a hiki i ka neʻe ʻana
C. e paʻi ana i kahi pā paʻa a hiki i kou hou ʻana
D. Holo paikikala mai ka home a i ke kula
Pahana
ʻAno hana pāʻoihana:
W = ΣF s
ʻIke: W = ka hoʻoikaika a i ʻole ka hana, F = ka ikaika, s = ka neʻe ʻana
Ma muli o ke ʻano ma luna, aia ka hana inā aia ka ikaika a aia ka neʻe ʻana (aia ka neʻe ʻana).
ʻO C ka pane pololei.
Puna nīnau:
Nā Nīnau Hoʻokolohua ʻEpekema Lahui no ke Kula Kiʻekiʻe Haʻahaʻa/Kula Kiʻekiʻe ʻIslama
