Yg tau jwab ya,pkai caranya dan pkai rumusnya
1.brpa kalor yg diperlukan utk menaikkan suhu2kg aluminium dari 25 derajat C mjd 70 derajat C,jika kalor jenis aluminium adalah 880 J/kg derajat C ?
2.brapa bnyak kalor yg diperlukan oleh 2 kg alkohol agar suhunya bertambah 30 derajat C.Jika kalor jenis alkohol 2,3 X 10 kibik J/kg derajat C ?
3.brpa kalor yg diperlukan utk menaikkan suhu 0,5 kg tembaga dari 30 derajat C mjd 60 derajat C jika kalor jenis tembaga 390 J/kg derajat C ?
4.air 2000g suhunya 80 derajat C didinginkan shg suhunya mjd 20 derajat C.Hitunglah banyaknya kalor yg dilepaskan bila kalor jenis air 4,19 X 10 kibik J/kg derajat C ?

2
Yang tau di jawab ya :)

Ex:
(+) maria always playstennis twice a week
(-) maria does not always play tennis twice a week
(?) doesmaria alwaysplay tennis twice a week
yes,she does
no,she doesn't

*ariel usually (swim) in the pool
(+)
(-)
(?)
....
....
*lisasometis (plant) flowers on sunday
(+)
(-)
(?)
....
....
*gerda and luna (watch) a korean drama at night
(+)
(-)
(?)
....
....
*my fatheralways (read) a newspaper in the
1.a kite - in the afternoon - usually - Sandy - plays
2.email - always - Refanza - his - friends - to - sends
3.in the morning - my father - a newpaper - reads
4.meat - some - in supermarket - the - aunt - my - buys
5.often - basketball - Julia - plays - on Sundays
6.project - his - always - does - Sukma - well
7.morning - every - doll - a - play - sister - little - my - doesn't
8.always - Reno - come - does - school - to - on - time?
9.every-day - do - students - the - uniform - school - wear?

Jawabanmu

2014-03-25T14:53:21+07:00
1. Q = m.c.t
       = 2 kg. 880j/kg. (70-25)
       =2 kg. 880j/kg.45
       = 76200 J
no 3 n 4 ?
sama juga rumusnya, yg no. 4 tinggal diubah massanya jd kg.
makasih
oke
klo ini gmna?
1.brpa kalor yg diperlukan utk mengubah 5kg es bersuhu -8 derajat C mjd 5kg uap air bersuhu 100 derajat C. (kalor jenis es 2,10kibik j/kg derajat C,kalor jnis air 4,2X 10kibik j/kg derajat C,kalor lebur es 3,36X10 pangkat 5 j/kg dan kalor uap air 2,26X10 pangkat 6 j/kg)?
2014-03-25T14:56:44+07:00
1.Q=massaxkalor jenisxkenaikan suhu
     =2kg x 880 J x (70 - 25)
     =2 kg x 880 J x 45 derajat C
     =79200 kal