5 Tusaalooyin oo ku saabsan su'aalaha kor u qaadista
1. Miisaanka culayska hawada ku jira waa 3 N, miisaanka culayska biyaha ku jira waa 2,8 N. Immisa xoog oo kor u kaca ah ayay biyuhu ku sameeyaan culayska?
Dood:
2. Birtu waxay miisaankeedu yahay 100 N marka hawada lagu cabbiro iyo 80 N marka biyaha lagu cabbiro. Waa maxay mugga birta?
Dood:
Waa la ogyahay in:
w = 100 N
hawada w = 80 N
La weydiiyay: Mugga birta ?
Mugga birta biyaha lagu dhex shubay wuxuu la mid yahay mugga biyaha la barakiciyay.
3. Dhagaxu wuxuu leeyahay cufnaan dhan 10 kg. Marka lagu miisaamo biyaha, cufnaanta dhagaxu waa 8,2 kg. Waa maxay cufnaanta dhagaxa?
Dood:
Waa la ogyahay in:
g = 9,8 m/s2
m = 10 kg
biyo m = 8,2 kg
Waxaa la weydiiyay: Cufnaanta dhagaxa (?
Jawaab:
4. Baloog alwaax ah oo dhererkiisu yahay 2,5 m, ballaciisu yahay 0,5 m iyo dhumucdiisuna tahay 0,4 m. Haddii alwaaxdu ay biyo ku jirto, cufnaanta biyuhuna ay tahay 1000 kg/m3 , markaa cabbirka cadaadiska kor u kaca waa ... (g = 10 N/kg)
A. 400 N
B. 500 N
C. 4.000 N
D. 5.000 N
Dood
Waa la ogyahay in:
Mugga saddex-jibbaaran (V) = dhererka x ballaca x dhumucdiisuna = 2,5 x 0,5 x 0,4 = 0,5 m 3
Cufnaanta biyaha ( ρ ) = 1000 kg/ m3
Dardargelinta cufisjiidadka awgeed (g) = 10 N/kg
La weydiiyay: Baaxadda xoogga ruxaya
Jawaab:
Qaacidada xoogga fuulitaanka:
F = ρ g V
Sharaxaad: F = xoog kor u kaca, ρ = Cufnaanta, g = dardargelinta cufisjiidadka, V = mugga
Dhammaan mugga walxaha biyaha hoostooda ku jira si xoogga kor u kaca loo xisaabiyo iyadoo la adeegsanayo qaacidada kore.
F = (1000)(10)(0,5) = (1000)(5) = 5000 Newtons
Jawaabta saxda ah waa D.
5. Miisaanka shayga hawada ku jira waa 100 N, ka dibna waxaa la dhigayaa dareere si mugga uu u kordho 1,5 m3 . Haddii cuf-isjiidadka gaarka ah ee dareere uu yahay 10 N/m3 , markaa miisaanka shayga ku jira dareeraha waa...
A. 1.500 N
B. 115 N
C. 85 N
D. 6,7 N
Dood
Waa la ogyahay in:
Miisaanka shayga hawada ku jira (w) = 100 Newtons
Kordhinta mugga dareeraha = mugga walaxda dareeraha ku dhex milmay (V) = 1,5 m 3
Cuf-isjiidadka gaarka ah ee dareeraha = 10 N/m 3
La Doonayo: Miisaanka shay ku jira dareere
Jawaab:
Qaacidada miisaanka shay ku jira dareere:
Miisaanka walaxda dareeraha ah = miisaanka walaxda hawada ku jirta - baaxadda xoogga qulqulaya
Miisaanka walaxda dareeraha ah = 100 Newtons - baaxadda xoogga qulqulaya
Marka hore xisaabi baaxadda xoogga gariirka si aad u xisaabin karto miisaanka shayga ku jira dareeraha.
Qaacidada xoogga fuulitaanka:
F A = ρ g V
Macluumaadka:
F A = xoog firfircoon = xoog ay dareere ku kiciso shay ku jira dareeraha
ρ = cufnaanta dareeraha
g = dardargelinta cufisjiidadka awgeed
V = mugga walaxda dareeraha ku dhex milmay
Dardargelinta cufisjiidadka (g) waa la yaqaan, mugga shayga ku dhex milmay dareeraha waa la yaqaan, laakiin cufnaanta weli lama oga. Sidaa darteed, marka hore xisaabi cufnaanta dareeraha.
Cufis-jiidad gaar ah:
Cuf-isjiidadka gaarka ah ee dareeraha = 10 N/m 3
w / V = 10 N/m 3
mg / V = 10 N/m 3
m (10) / V = 10 N/m 3
m / V = 1 kg/m 3
ρ = 1 kg/ m3
Markaa cufnaanta dareere-qaadku waa 1 kg/ m3
Cabbirka xoogga gariirka :
F A = ρ g V = ( 1 kg/m 3 )(10 m/s 2 )(1,5 m 3 ) = 15 kg m/s 2 = 15 Newtons
Miisaanka shay ku jira dareere:
Miisaanka walaxda dareeraha ah = 100 Newtons – 15 Newtons
Miisaanka walaxda dareeraha ah = 85 Newtons
Jawaabta saxda ah waa C.
Su'aalo tusaale ah oo ku saabsan sharciga Archimedes
