Muenzaniso weMibvunzo yeBhizinesi

Mienzaniso 9 yeMibvunzo yeBhizinesi

1. Simba remaNewton makumi maviri rinoiswa pabhokisi kusvika bhokisi rafamba chinhambwe chemamita maviri. Basa rinoitwa nesimba F pabhokisi iri…
Kukurukurirana
Zvinozivikanwa :
Simba (F) = 20 N
Kutama (s) = mamita mana
Angle = 0 (gwara resimba rakafanana negwara rekufamba kana gwara resimba rinoenderana negwara rekufamba zvekuti kona inoumbwa nesimba nekufamba iri zero)
Akabvunzwa : Kuedza (W)
Jawab :
Catatan :
Kana kutungamira kwesimba kwakafanana nekutungamira kwekutama, verenga basa uchishandisa fomura W = F s, pasina chikonzero chekuwedzera cos tit.

2. Chinhu chakamira panzvimbo yakatsetseka pasi. Simba F = 10 N rinoiswa pachinhu chacho, zvichiita kona ye30^o padenga repasi. Kana chinhu chikafamba mita imwe, simba F rinoita basa rakawanda sei pachinhu chacho?
Kukurukurirana
Zvinozivikanwa :
Simba (F) = 10 Newtons
Simba riri munzira yekutama (F)_x) = F cos 30^o = (10)(0,5√3) = 5√3 MaNewton
Kutama (s) = mamita mana
Akabvunzwa : kuedza (W) ?
Jawab :
W = F_x s = (5√3)(1) = 5√3 Joule

3. Chinhu chine huremu hwe1 kg chinodonha zvakasununguka kubva pakukwirira kwemamita maviri. Kana kukurumidza kunokonzerwa negiravhiti kuri 10 m/s², sarudza basa rinoitwa nesimba rinokwevera zvinhu pachinhu chacho!
Kukurukurirana
Zvinozivikanwa :
Huremu hwechinhu (m) = 1 kg
Kureba (h) = mamita makumi maviri
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s²
Akabvunzwa : Basa rinoitwa nesimba rinokwevera zvinhu pasi (W)
Jawab :
Kutungamira kwesimba regiravhiti kana huremu (w) kwakadzika pasi, kutungamira kwekutama kwechinhu (s) kwakadzikawo pasi kuitira kuti simba regiravhiti rive munzira imwecheteyo nekutama kwechinhu.
W = F s = wh = mgh
W = (1)(10)(2) = 20 Joule

4. Chitubu chinorembera nehuremu hwe1 kg kuitira kuti chitubu chiwedzere kureba kwe2 cm. Kana kukurumidza kunokonzerwa nekukweva kuri 10 m/s², sarudza (a) chisipiti chinogara chiripo (b) basa rinoitwa nechisipiti pamutoro
Kukurukurirana
Zvinozivikanwa :
Huremu (m) = 1 kg
Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s²
Kuwedzera kwehurefu hwechitubu (x) = 2 cm = 0,02 metres
Akabvunzwa : chitubu chinoramba chiripo uye basa rinoitwa nemauto echitubu
Jawab :
(a) Chitubu chinogara kwenguva refu
Fomura yemutemo waHooke :
F = k x.
Chinja fomura iyi kuti uverenge chisingaperi chechirimo:
k = F / x = w / x = mg / x
k = (1)(10) / 0,02 = 10 / 0,02
k = 500 Newton/mita
(b) Basa rakaitwa nemauto echitubu
W = – ½ kx²
W = – ½ (500)(0,02)²
W = – (250)(0,0004)
W = -0,1 Joule
Basa rinoitwa nesimba rechitubu pamutoro harina kunaka nekuti divi resimba rechitubu rakapesana nedivi rekubviswa kwemutoro.

5. Bhokisi richiri pamusoro pevhu rinokurumidziswa nesimba re10 N kuitira kuti bhokisi rifambe chinhambwe chemamita maviri. Kana simba rekusunda riri munzira imwecheteyo nekufamba kwebhokisi uye bhokisi richishandiswa nesimba rekukweshana kwekinetic remaNewton maviri, saka basa rese rinoitwa pabhokisi...
Kukurukurirana
Zvinozivikanwa :
Simba (F) = 10 Newtons
Kinetic friction force (F)_k) = 2 Newton
Kutama (s) = mamita mana
Akabvunzwa : Kushanda nesimba kwakazara (W)_chizere)
Jawab :
Basa rinoitwa nechisimba (F):
W₁ = F s cos 0 = (10)(2)(1) = 20 Joules
Basa rinoitwa ne kinetic friction force (F)_k):
W₂ =F_k s = (2)(2)(cos 180) = (2)(2)(-1) = -4 Joules
Kuedza kwakazara ndekwekuti:
W_chizere =W₁ - W₂
W_chizere = 20 - 4
W_chizere = 16 Joule

6. Chinhu chine huremu hwe5 kg chiri pamusoro penyika nemamita gumi. Kumhanya kunokonzerwa negiravhiti 10 m/s ^-2 . Huwandu hwebasa rinodiwa kuti chinhu chifambiswe kusvika pakakwirira nemamita gumi nemashanu pamusoro penyika...

A. . 75 Joule

B. . 250 Joule

C. . 500 Joule

D. . 750 Joule

E. 1.250 Joules

Kukurukurirana

Zvinozivikanwa kuti:

Huremu hwechinhu (m) = 5 kg

Kureba (h) = mamita makumi maviri

Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s ²

Mubvunzo: Kuedza kufambisa chinhu kusvika pakakwirira mamita gumi nemashanu

Mhinduro:

Kuedza kufambisa chinhu kwakaenzana nesimba rinokwevera zvinhu pasi rinoita basa racho.

Fomura yebasa rakaitwa nesimba regiravhiti:

W = wh = mgh

Tsananguro: W = kushanda nesimba, w = simba rinokwevera pasi, h = kureba, m ​​= uremu, g = kukurumidza kwesimba rinokwevera pasi

Fomura yebasa raitwa ndeiyi:

W = wh = mgh = (5 kg)(10 m/s ² )(10 m) = 500 kg m ² /s ² = 500 Joules

Mhinduro chaiyo ndiC.

7. Chinhu chine huremu hwe2 kg chinofamba panzvimbo yakatsetseka nekumhanya kwe2 m/s ^-1 . Nguva diki diki gare gare, chinhu chinofamba nekumhanya kwe5 m/s ^-1 . Basa rinoitwa pachinhu ichi munguva iyi…

A. 4 Joule

B. 9 Joule

C. 15 Joule

D. 21 Joule

E. 25 Joules

Kukurukurirana

Zvinozivikanwa kuti:

Huremu hwechinhu (m) = 2 kg

Kumhanya kwekutanga (v _o ) = 2 ms ^–1

Kumhanya kwekupedzisira (v _t ) = 5 ms ^–1

Mubvunzo: Basa rakaitwa pachinhu panguva yekuchinjana kwenguva

Mhinduro:

Dzidziso yesimba rekushanda-kinetic inoti basa rose rinoitwa pachinhu rakaenzana nekuchinja kwesimba rekinetic rechinhu.

W = ΔEK = EK ₂ – EK ₁ = 1/2 mv _t ² – 1/2 mv _o ² = 1/2 m (v _t ² – v _o ² ) = 1/2 (2) (5 ² -2 ² ) = (1)(25-4) = 21 Joules

8. Tafura ine huremu hwe10 kg inotanga yakamira pasi rakatsetseka, inosundidzirwa kwemasekonzi matatu uye inofamba yakatwasuka nekukurumidzisa kwe2 ms ⁻² . Huwandu hwebasa rinoitwa…

A. 20 Joule

B. 30 Joule

C. 60 Joule

D. 180 Joule

E. 360 Joules

Kukurukurirana

Zvinozivikanwa kuti :

Huremu (m) = 10 kg

Kumhanya kwekutanga (vo _o ) = 0 (pakutanga tafura yacho haichinji)

Nguva yepakati (t) = masekondi maviri

Kukurumidzisa (a) = 2 m/s ²

Akabvunzwa : kuedza (W)?

Mhinduro :

Kutanga, verenga daro rakafambwa uchishandisa fomura yeGLBB:

s = vot ₊ ½ pa ² = (0)(3) + ½ (2)(3) ²

s = 0 + (1)(9) = 9

Basa rakaitwa patafura:

W = F s = (ma)(s) = (10)(2)(9) = 180 Joules

Mhinduro chaiyo ndiD.

9. Bhokisi rine huremu hwe 1,5 kg rinosundirwa kumusoro nesimba risingaperi F = 15 N padenderedzwa rakanamira sezvakaratidzwa mumufananidzo. Fungidzira kuti kukurumidza kunokonzerwa negiravhiti (g) i10 ms ^-2 uye kukweshana pakati pebhokisi nedenderedzwa rakanamira i zero. Basa rose rinoitwa pabhokisi i…

A. 15 J

B. 30 J

C. 35 J

D. 45 J

E. 50 J

Kukurukurirana

Zvinozivikanwa kuti :

Huremu hwebhuroko (m) = 1,5 kg

Kukurumidza kunokonzerwa negiravhiti (g) = 10 m/s ²

Kurema kwebhuroko (w) = mg = (1,5)(10) = 15 Newton

Simba rekusundira (F) = 15 Newton

Mubvunzo : basa rose rakaitwa pabhuroko (W)?

Mhinduro :

Kune masimba maviri ari kushanda pabhuroko; simba rakafanana nekufamba kwebhuroko, kureva simba rekusundidzira (F) uye huremu hwebhuroko hwakafanana nepamusoro penzvimbo yakatsamira (w _x ).

Basa rinoitwa neboka rinosundidzira nderekuti:

W ₁ = F s = (15 N)(2 m) = 30 N m = 30 Joules

Basa rakaitwa negravity wx:

W ₂ = w _x s = (w sin 30 ^o )(2 m) = (15 N)(1/2)(2 m) = 15 N m = 15 Joules

Basa rose rakaitwa pabhuroko:

W _yose = W ₁ – W ₂ = 30 J – 15 J = 15 Joules

Mhinduro chaiyo ndiA.