Latihan Pemuaian (hal 41).docx

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LATIHAN PEMUAIAN JAWABAN SOAL LATIHAN HALAMAN 41 1. Pilihan Ganda 1) B 2) D 3) D 4) C 5) C 2. Uraian 1) Diketahui : T1 = 30 oC T2 = 60 oC Lo = 100 m α = 0,000011 /oC Ditanyakan : ∆L = ….? Peny : ∆l = Lo . α . ∆T = 100 . 0,000011 (60 – 30) = 0,0011 x 30 = 0,033 m = 3,3 cm 2) Diketahui : T1 = 25 oC Lo = 8 m, T2 = 3 x 25 oC = 75 oC Ditanyakan : L2 ? Peny : ∆L = Lo . α . ∆T = 8 (14 x 10-2) (75 - 25) = 112 x 10-2 . 50 = 5.600 x 10-2 = 0,0056 m L = Lo + ∆L = 8 + 0,0056 = 8, 0056 m 3) Diketahui : T1 = 30 oC Lo = 100 cm L1 = 100,1 cm ΔL = 0,1 cm. Ditanyakan : T2 = ….? Peny : ΔL= Lo α ΔT 0,1 = 100 (10-5) ΔT 0,1 = 10-3 ΔT ΔT = 100 oC Maka suhu saat panjangnya 100,1 cm adalah : ΔT = T2 – T1 100 = T2 – 30 T2 = 100 + 30 T2 = 130 oC

4) Diketahui : Vo = 2 dm3, To = 0°C T1 = 100°C α = 00000171°C Peny : V = V0 {1 + γ . ΔT} = 2 (1 + (3 x 0,000017) (100 - 0)} = 2 {1 + (0,000051 x 100)} = 2 (1 + 0,0051) = 20.102 dm3 Jadi, volum kubus adalah 20.102 dm3 Diketahui : T1 = 27 oC = 27 + 273 = 300 Kelvin T2 = 87 oC = Vo = 200 liter P1 = 6 atm Ditanyakan : a. V2 = ...? (jika tekanan tetap) b. P2 = ...? (jika volume tetap ) c. P2 = ...? (jika V2 = 150 liter) Peny: a. Tekanan tetap V2 x T1 = V1 x T2 V2 x 300 = 200 x 360 72.000

V2 = 300 V2 = 240 Jadi Volume setelah dipanaskan adalah 240 liter. b. Volume tetap P2 x T1 = P1 x T2 P2 x 300 = 6 x 360 P2 =

2.160 300

P2 = 7,2 Jadi tekanan setelah dipanaskan adalah 7,2 atm c. Besar tekanan saat volumenya menjadi 150 liter P2 = P2 =

P1 x V1 x T2 V2 x T1 6 x 200 x 360 150 x 300

P2 = 9,6 atm Jadi tekanannya adalah 9,6 atm

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