4 Tusaalooyin oo ah Dhibaatooyinka Isle'egta Dheecaanka ah
1. Qayb ka mid ah tuubo waxay leedahay dhexroor dhan 20 cm qaybta kalena waxay leedahay dhexroor dhan 10 cm. Haddii heerka socodka biyuhu ee qaybta dhexroorka weyn ee tuubada uu yahay 30 cm/s, markaa heerka socodka biyuhu ee qaybta dhexroorka yar ee tuubada waa...
A. 80 cm/s
B. 100 cm/s
C. 120 cm/s
D. 130 cm/s
E. 140 cm/s
Dood:
Waa la garanayaa :
r1 = 10 cm, r2 = 5cm
v1 = 30 cm/s
La weydiiyay :
v2 ?
Jawab :
Isleegta joogtada ah ee dareeraha:
A1 v1 =A2 v2
Macluumaadka:
A1 = aagga isgoyska ee tuubada 1, v1 = heerka socodka biyaha ee tuubada 1
A2 = aagga isgoyska ee tuubada 2, v2 = heerka socodka biyaha ee tuubada 2
Bedka isgoyska tuubada:
A1 = phi r12 = (3,14)(10 cm)2 = (3,14) (100 cm)2)
A2 = phi r22 = (3,14)(5 cm)2 = (3,14) (25 cm)2)
Heerka socodka biyaha ee tuubada 2aad:
A1 v1 =A2 v2
(3,14) (100 cm)2)(30 cm/s) = (3,14)(25 cm)2)(v2)
(100)(30 cm/s) = (25)(v)2)
3000 / 25 = v2
v2 = 120 cm/s
Jawaabta saxda ah waa C.
2. Saliiddu waxay ka socotaa tuubada A ilaa tuubada B ka dibna tuubada C. Saamiga aagga isgoyska ee tuubada A iyo aagga isgoyska ee tuubada C waa 5:3. Haddii heerka socodka saliidda ee tuubada A uu la mid yahay 2v, markaa heerka socodka saliidda ee tuubada C waa...
A. (3/10)v
B. 2v
C. (10/3)v
D. 5v
E. 9kiiv
Dood:
Waa la garanayaa :
A1 = 5, A2 = 3, v1 = 2v
La weydiiyay :
v2 ?
Jawab :
A1 v1 =A2 v2
(5)(2v) = (3)(v)2)
10v = 3(v)2)
v2 = (10/3)v
Heerka socodka saliidda ee tuubada C waa (10/3) v
Jawaabta saxda ah waa C.
3. Dareere ayaa dhex mara tuubo sida ku cad sawirka soo socda. Haddii aagga isgoyska A1 = 8 cm2 , A2 = 2 cm2 iyo xawaaraha dareeraha v2 = 2 m/s markaas cabbirka v1 waa …
A. 0,5 ms-1
B. 1,0 ms-1
C. 1,5 ms-1
D. 2,0 ms-1
E. 2,5 ms-1
Dood
Waa la garanayaa :
Aagga isgoyska 1 (A)1) = 8cm2
Aagga isgoyska 2 (A)2) = 2cm2
Xawaaraha dareeraha ah ee isgoyska qaybta 2 (v)2) = 2 m/s
La weydiiyay : xawaaraha dareeraha ee isgoyska qaybta 1aad (v)1)
Jawab :
Isleegta joogtada ah ee dareeraha :
A1 v1 =A2 v2
8v1 = (2)(2)
8v1 = 4
v1 = 4 / 8 = 0,5 m/s
Jawaabta saxda ah waa A.
4. Fiiri sawirka! Haddii dhexroorka qaybta weyn ee isgoyska uu laba jibaar ka badan yahay dhexroorka qaybta yar ee isgoyska, xawaaraha socodka dareeraha ee tuubada yar waa...
A. 01 ms-1
B. 04 ms-1
C. 08 ms-1
D. 16 ms-1
E. 20 ms-1
Dood
Waa la garanayaa :
Dhexroor weyn oo isgoys ah (d)1= 2
Gacan weyn oo isgoys ah (r)1) = ½ d1 = ½ (2) = 1
Aag weyn oo isgoys ah (A1) = π r12 = π (1)2 = π (1)= π
Dhexroor yar oo isgoys ah (d)2= 1
Gacan yar oo isgoys ah (r)2) = ½ d2 = ½ (1) = ½
Aag yar oo isgoys ah (A2) = π r22 = π (1/2)2 = π (1/4)= ¼ π
Xawaaraha socodka dareeraha ee isgoys weyn (v1) = 4 m/s
La weydiiyay : xawaaraha socodka dareeraha ee isgoys yar v2)
Jawab :
Isleegta joogtada ah ee dareeraha :
A1 v1 =A2 v2
π 4 = ¼ π (v2)
4 = ¼ (v2)
v2 = 8m/s
Jawaabta saxda ah waa C.
