Jawab:
AT
= t2—
t1 =30°C-20°C= 10°C
A =1,5m2
h =7,5x10-1kal/sm2°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
(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.
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
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.
Setelah selesai klik JOIN.
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