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Sabtu, 23 Maret 2013

Soal dan Pembahasan Perpindahan Kalor (Konduksi, Konveksi, Radiasi)

1. Suhu udara dalam sebuah ruangan sebesar 20°C, sedangkan suhu permukaan jendela padaruangan tersebut 30°C. Berapa laju kalor yang diterima oleh jendelakaca seluas 1,5 m2, jika koefisien konveksi udara saat itu 7,5 X 10J1 kal/s m2 °C?
Text Box:  Jawab:

AT = t2— t1 =30°C-20°C= 10°C
A =1,5m2 
h =7,5x10-1kal/sm2°C

H =h.A.ΔT 
(7,5 x 10-1kal/sm2°C) (1,5m2) (10°C) = 11,25kal
Jadi, laju kalor yang diterima oleh jendela kaca 11,25 kal

2.Sebuah benda memiliki permukaan hitam sempurna bersuhu 127°C. Luas permukaan 300 cm2 memancarkan energi ke lingkungan yang bersuhu 27°C. Tentukan energi per satuan waktu yang dipancarkan benda tersebut.



3. Pada Suhu 2.000 K, Sebuah benda memancarkan energi SebeSar 480 J/s. Berapa energi yang dipancarkan benda tersebut pada Suhu 3.000 K?
Jawab:
W1 : W2 = (T1 : T2)4 
480 : W2 = (2000 : 3000)4
480 : W2 = (2000 : 3000)4 
480 : W2 = 16 : 81
W2 = 2430 J/s

4. Teh panas bersuhu 87°C dituangkan ke dalam dua buah teko yang satu teko keramik warna hitam (e = 0,8) dan satunya lagi teko mengkilat (e = 0,3). Jika Suhu ruang 27°C, berapa kecepatan hilangnya kalor dari setiap teko ke lingkungan jika luas permukaan teko adalah 2 x 102 m2?


5. Pengaduk terbuat dari aluminium dengan luas penampang 5 mm2 dan panjang 10cm. Jika suhu air dalam bejana 60°C, suhu di ujung pengaduk 62°C, dan konduktivitas termal = 200 W/m°C, tentukan: 
a.   kecepatan aliran kalor pada aliran kalor pada pengaduk, 
b.   kalor yang mengalir melalui pengaduk Selama 1jam.


6. Kopi panas bersuhu 77°C dituangkan ke dalam cangkir keramik warna cokelat (e = 0,5). Jika suhu ruang 27°C, tentukan kecepatan hilangnya kalor dari cangkir ke lingkungan. (luas cangkir 20cm2)



Bagi yang menginginkan jawaban soal dan pembahasan secara lengkap silahkan klik link berikut: 

SOAL & PEMBAHASAN PERPINDAHAN KALOR 

lalu input nama dan email yang aktif secara benar. Selanjutnya klik JOIN NOW dan isi form pendaftaran dengan data jujur dan sebenarnya 

(nama dan email harus sama dengan input pertama).

Setelah selesai klik JOIN.



 
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