Mienzaniso mishanu yemibvunzo yekuyangarara
1. Huremu hwemutoro uri mumhepo i3 N, huremu hwemutoro uri mumvura i2,8 N. Mvura inoshandisa simba rakadii pamutoro?
Kukurukurirana:
2. Simbi inorema 100 N kana ikayerwa mumhepo uye 80 N kana ikayerwa mumvura. Vhoriyamu yesimbi iyi yakaita sei?
Kukurukurirana:
Zvinozivikanwa kuti:
w = 100 N
w mhepo = 80 N
Akabvunzwa: Vhoriyamu yesimbi ?
Huwandu hwesimbi yakanyudzwa mumvura hwakaenzana nehuwandu hwemvura yakabviswa.
3. Dombo rine huremu hwe10 kg. Kana richiyerwa mumvura, huremu hwedombo hunosvika 8,2 kg. Kurema kwedombo kwacho kwakadii?
Kukurukurirana:
Zvinozivikanwa kuti:
g = 9,8 m/s2
m = 10 kg
m mvura = 8,2 kg
Akabvunzwa: Kuwanda kwedombo ( ?
Mhinduro:
4. Chivharo chehuni chine urefu hwe 2,5 m, upamhi hwe 0,5 m uye ukobvu hwe 0,4 m. Kana huni hwakanyudzwa mumvura, uye huwandu hwemvura huri 1000 kg/m3 , saka hukuru hwekumanikidzwa kwepamusoro ndewe … (g = 10 N/kg)
A. 400 N
B. 500 N
C. 4.000 N
D. 5.000 N
Kukurukurirana
Zvinozivikanwa kuti:
Vhoriyamu ye cuboid (V) = kureba x upamhi x ukobvu = 2,5 x 0,5 x 0,4 = 0,5 m 3
Kuwanda kwemvura ( ρ ) = 1000 kg/ m3
Kukurumidza kunokonzerwa negiravhiti (g) = 10 N/kg
Akabvunzwa: Hukuru hwesimba rinopfuta
Mhinduro:
Fomura yesimba rekusimudzira:
F = ρ g V
Tsananguro: F = simba rekudzika, ρ = Kuwanda, g = kukurumidza kwegiravhiti, V = vhoriyamu
Mavhoriyamu ese ezvinhu zvakanyudzwa mumvura saka simba rekufamba rinoverengwa uchishandisa fomura iri pamusoro.
F = (1000)(10)(0,5) = (1000)(5) = 5000 Newtons
Mhinduro chaiyo ndiD.
5. Huremu hwechinhu chiri mumhepo i100 N, chobva chaiswa mumvura kuitira kuti huwandu huwedzere ne1,5 m3 . Kana simba remumvura riri 10 N/m3 , saka huremu hwechinhu chiri mumvura i...
A. 1.500 N
B. 115 N
C. 85 N
D. 6,7 N
Kukurukurirana
Zvinozivikanwa kuti:
Kurema kwechinhu chiri mumhepo (w) = 100 Newtons
Kuwedzera kwehuwandu hwemvura = huwandu hwechinhu chakanyudzwa mumvura (V) = 1,5 m 3
Huremu hwakanyanya hwemvura = 10 N/m 3
Zvinodiwa: Kurema kwechinhu chiri mumvura
Mhinduro:
Fomura yehuremu hwechinhu chiri mumvura:
Kurema kwechinhu chiri mumvura = huremu hwechinhu chiri mumhepo - hukuru hwesimba rinoyerera
Kurema kwechinhu chiri mumvura = 100 Newtons - hukuru hwesimba rinoyerera
Kutanga verenga hukuru hwesimba rinoyerera kuti ugone kuverenga huremu hwechinhu chiri mumvura.
Fomura yesimba rekusimudzira:
F A = ρ g V
Information :
F A = simba rinosimudzira = simba rinoitwa nemvura pachinhu chiri mumvura
ρ = kuwanda kwemvura
g = kukurumidza nekuda kwesimba rinokwevera pasi
V = vhoriyamu yechinhu chakanyudzwa mumvura
Kukurumidza kunokonzerwa negiravhiti (g) kunozivikanwa, huwandu hwechinhu chakanyudzwa mumvura hunozivikanwa, asi huwandu hwacho hahusati hwazivikanwa. Saka, tanga waverenga huwandu hwemvura.
Simba rinokwevera zvinhu pasi chairo:
Huremu hwakanyanya hwemvura = 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
Saka huwandu hwemvura iyi i1 kg/ m3
Kukura kwesimba rekusimudzira :
F A = ρ g V = ( 1 kg/m 3 )(10 m/s 2 )(1,5 m 3 ) = 15 kg m/s 2 = 15 Newtons
Kurema kwechinhu chiri mumvura:
Kurema kwechinhu chiri mumvura = 100 Newtons – 15 Newtons
Kurema kwechinhu chiri mumvura = 85 Newtons
Mhinduro chaiyo ndiC.
Mienzaniso yemibvunzo pamusoro pemutemo waArchimedes
