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FISIKA
(pembahasan soal mid semester ganjil)

Mr. Lulut & XI IPA KHUSUS

SMAN 1 Bandar Sribhawono
Lampung - Timur
Tp. 2011 – 2012
Menu Utama
XI IPA Khusus

Soal &
Pembahasan

Tim Penyusun
Pembahasan soal Mis semester ganjil tp.
2011 - 2012
XI IPA Khusus
SMAN 1 Bandar Sribhawono
Lampung - Timur
Merupakan kelas khusus angkatan
keempat dengan jurusan IPA.
Siswanya terdiri dari 26 orang siswa.
BACK TO MENU
Pembahasan soal Mis semester ganjil tp.
2011 - 2012
SOAL & PEMBAHASAN

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
1.

• Pembahasan :

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
2.

Sebuah pertikel bergerak pada bidang XY dengan persamaan r =
4t2 i + (t2+4t) j meter, maka besar kecepatan partikel pada
saat t=1s adalah…..m/s
Pembahasan :
R = 4t2 i + (t2+4t) j
= 8t i + (2t+4) j
=8i+6j
2

6

2

V

8

V

100

V

10 M / S
Pembahasan soal Mis semester ganjil tp.
2011 - 2012
3.

Sebuah partikel bergerak dengan lintasan berupa
garis denga persamaan gerak
, maka kecepatan partikel saat t = 4s adalah .... m/s

Pembahasan :

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
4.

sebuah benda bergerak dengan persamaan kecepatan
v=2 + 4t. Maka percepatan rata- rata benda antara
t=1s sampai t=3s adalah ........m/

Pembahasan :

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
5.

Sebuah partikel
bergerak pada
bidang XY dengan
perssamaan
v=3t2+6t-5 dalam
m/s. maka
perpindahan partikel
setelah bergerak
selama 2s adalah…

Pembahasan : V=3t2+6t-5
S=……(t=2 dt)
S=∫02 Vdt
=∫20(3t2+6t-5)dt→ t3+t2-st∫2
→ t3+3t2-5t∫2
→ 8+12-10
→ 10 m

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
6.

Sebuah partikel bergerak melingkar dengan posisi sudut = 2t – 4t² + 2t³.
Kecepatan sudut rata-rata selang waktu t = 1 s sampai t = 3 s
adalah..................rad/s
Jawab:
= 2t – 4t² + 2t³
t₁ = 1 s
t₂ = 3 s
₁ = 2t – 4t² + 2t³
= 2.1 – 4.1² + 2.1³
= 2–4+2
=0
₂ = 2t – 4t² + 2t³
= 2.3 – 4.3² + 2.3³
= 6 – 36 + 54
= 24
Pembahasan soal Mis semester ganjil tp.
2011 - 2012
7

Sebuah partikel
bergerak
melingkar
Dengan posisi
sudut Θ = 3t +
6t – 4.
Maka kecepatan
sudut awal
partikel
adalah…..

Pembahasan :
Diket
= Θ = 3t +
6t – 4
W

= dΘ
dt
= 6.0 + 6 (t=0)
= 0+6
= 6 rad/s

Pembahasan soal Mis semester ganjil tp. 2011 2012
8.

roda berputar dengan perpindahan sudut
suatu titik berada 20 cm dari pusat roda.
Memiliki besar percepatan sentripetal
setelah bergerak selama 1 s adalah …

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
Pembahasan :

= 10

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
9.

Sebuah partikel bergerak melingkar
dengan posisi sudut
.
Perceptan sudut rata-rata selang waktu
t=1 s sampai t=5 s adalah …….

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
Pembahasan :

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
10.

Sebuah benda bergerak
melingkar dengan
kecepatan sudut
w = ( 4t +10 ) rad/s. Jika
pada saat t = 0 s posisi
sudut benda 25 rad, maka
posisi sudut benda pada
saat t = 2 s adalah……..

Pembahasan:
Diket : w = 4t + 10
t=0s
sdt = 25
rad
t=2s
sdt = ??
Sdt
= s w dt
= s (4t + 10) dt
Sdt
25

Sdt

Pembahasan soal Mis semester ganjil tp.
2011 - 2012

= 2t2 + 10t + c25
= 2 x o2 + 10 x 0 + c
=c

= 2t2 + 10t + c
= 2 x 22 + 10 x 2 + 25
= 8 + 20 + 25
= 53
11.

Periode suatu planet dalam
mengorbit matahari 8
tahun, maka jarak planet tersebut
ke matahari adalah … km

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
Pembahasan :
T12 = r13
T22 = r23
1 = (150.10⁶)3
82
r23
r23 = (15.10⁷)3 82
(15.10⁷ )3 .43
r23 = (15.10⁷.4)3
r2 = 60.10⁷
= 6. 10⁸

Pembahasan soal Mis semester ganjil tp.
2011 - 2012
Tim Penyusun
Mr. Lulut
&
XI IPA KHUSUS

Pembahasan soal Mid semester
ganjil tp. 2011 - 2012

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FISIKA MID SEMESTER

  • 1. FISIKA (pembahasan soal mid semester ganjil) Mr. Lulut & XI IPA KHUSUS SMAN 1 Bandar Sribhawono Lampung - Timur Tp. 2011 – 2012
  • 2. Menu Utama XI IPA Khusus Soal & Pembahasan Tim Penyusun Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 3. XI IPA Khusus SMAN 1 Bandar Sribhawono Lampung - Timur Merupakan kelas khusus angkatan keempat dengan jurusan IPA. Siswanya terdiri dari 26 orang siswa. BACK TO MENU Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 4. SOAL & PEMBAHASAN Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 5. 1. • Pembahasan : Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 6. 2. Sebuah pertikel bergerak pada bidang XY dengan persamaan r = 4t2 i + (t2+4t) j meter, maka besar kecepatan partikel pada saat t=1s adalah…..m/s Pembahasan : R = 4t2 i + (t2+4t) j = 8t i + (2t+4) j =8i+6j 2 6 2 V 8 V 100 V 10 M / S Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 7. 3. Sebuah partikel bergerak dengan lintasan berupa garis denga persamaan gerak , maka kecepatan partikel saat t = 4s adalah .... m/s Pembahasan : Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 8. 4. sebuah benda bergerak dengan persamaan kecepatan v=2 + 4t. Maka percepatan rata- rata benda antara t=1s sampai t=3s adalah ........m/ Pembahasan : Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 9. 5. Sebuah partikel bergerak pada bidang XY dengan perssamaan v=3t2+6t-5 dalam m/s. maka perpindahan partikel setelah bergerak selama 2s adalah… Pembahasan : V=3t2+6t-5 S=……(t=2 dt) S=∫02 Vdt =∫20(3t2+6t-5)dt→ t3+t2-st∫2 → t3+3t2-5t∫2 → 8+12-10 → 10 m Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 10. 6. Sebuah partikel bergerak melingkar dengan posisi sudut = 2t – 4t² + 2t³. Kecepatan sudut rata-rata selang waktu t = 1 s sampai t = 3 s adalah..................rad/s Jawab: = 2t – 4t² + 2t³ t₁ = 1 s t₂ = 3 s ₁ = 2t – 4t² + 2t³ = 2.1 – 4.1² + 2.1³ = 2–4+2 =0 ₂ = 2t – 4t² + 2t³ = 2.3 – 4.3² + 2.3³ = 6 – 36 + 54 = 24 Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 11. 7 Sebuah partikel bergerak melingkar Dengan posisi sudut Θ = 3t + 6t – 4. Maka kecepatan sudut awal partikel adalah….. Pembahasan : Diket = Θ = 3t + 6t – 4 W = dΘ dt = 6.0 + 6 (t=0) = 0+6 = 6 rad/s Pembahasan soal Mis semester ganjil tp. 2011 2012
  • 12. 8. roda berputar dengan perpindahan sudut suatu titik berada 20 cm dari pusat roda. Memiliki besar percepatan sentripetal setelah bergerak selama 1 s adalah … Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 13. Pembahasan : = 10 Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 14. 9. Sebuah partikel bergerak melingkar dengan posisi sudut . Perceptan sudut rata-rata selang waktu t=1 s sampai t=5 s adalah ……. Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 15. Pembahasan : Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 16. 10. Sebuah benda bergerak melingkar dengan kecepatan sudut w = ( 4t +10 ) rad/s. Jika pada saat t = 0 s posisi sudut benda 25 rad, maka posisi sudut benda pada saat t = 2 s adalah…….. Pembahasan: Diket : w = 4t + 10 t=0s sdt = 25 rad t=2s sdt = ?? Sdt = s w dt = s (4t + 10) dt Sdt 25 Sdt Pembahasan soal Mis semester ganjil tp. 2011 - 2012 = 2t2 + 10t + c25 = 2 x o2 + 10 x 0 + c =c = 2t2 + 10t + c = 2 x 22 + 10 x 2 + 25 = 8 + 20 + 25 = 53
  • 17. 11. Periode suatu planet dalam mengorbit matahari 8 tahun, maka jarak planet tersebut ke matahari adalah … km Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 18. Pembahasan : T12 = r13 T22 = r23 1 = (150.10⁶)3 82 r23 r23 = (15.10⁷)3 82 (15.10⁷ )3 .43 r23 = (15.10⁷.4)3 r2 = 60.10⁷ = 6. 10⁸ Pembahasan soal Mis semester ganjil tp. 2011 - 2012
  • 19. Tim Penyusun Mr. Lulut & XI IPA KHUSUS Pembahasan soal Mid semester ganjil tp. 2011 - 2012