Page 158 - MUDAH DAN AKTIF BELAJAR FISIKA SMA KELAS X

038 :0;>@ 94=8A 30?0B 383458=8A8:0= A410608 10=G0:=G0 :0;>@ G0=6 38?4@ Tugas Anda 7.1
;C:0= AC0BC H0B C=BC: <4=08::0= AC7C :6 H0B B4@A41CB A414A0@ I "#&-
<4=C=9C::0= :0;>@ 94=8A 1414@0?0 H0B ?030 AC7C I 30= B4:0=0= Anda telah mengenal besaran
B4B0? 0B<>A54@ kalor jenis suatu benda. Diskusikan
dengan teman sekelas Anda jika
"#&- kalor jenis suatu zat besar, apakah
!0;>@ 4=8A 414@0?0 -0B ?030 (C7C I 30= )4:0=0= 0B< benda akan cepat panas atau
lambat panas?
"-03 +&/*4 "-03 +&/*4
!"5 "%"5 !"5 "*3
,(; ,(;
!C=8=60= ;:>7>; 4B8;
;C<8=8C< '0:A0
)4<1060 8@
4A8 0B0C 1090 4A J I
)8<07 208@ I
#0@<4@ C0? I
&4@0: 030= <0=CA80
!0GC &@>B48=
(4=6
Sumber: Physics, 1980
Mari Mencari Tahu
Ingatlah
!4B8:0 =30 14@90;0= 38 0B0A ?0A8@ 38 ?0=B08 38 10E07 B4@8: #0B070@8 =30 30?0B
<4@0A0:0= ?0A8@ :4@8=6 G0=6 B4@8=90: B4@0A0 ?0=0A !4<C380= =30 14@0;87
<4=68=90: 08@ ;0CB 8@ ;0CB @4;0B85 ;4187 38=68= 1C:0= &03070; ?0A8@ 30= 08@ ;0CB Kesetaraan kalori dan joule adalah
A0<0 A0<0 B4@:4=0 A8=0@ #0B070@8 #8A0;=G0 =30 B8=90C :6 08@ ;0CB 30= :6 1 kalori = 4,2 joule
?0A8@ ?0=B08 38 0=B0@0=G0 #4=C@CB =30 <0=0:07 G0=6 <4<8;8:8 :0;>@ 94=8A ;4187 1 joule = 0,24 kalori
1 kkal
= 1.000 kalori
B8=668 08@ 0B0C ?0A8@
3. Kapasitas Kalor
& ( ) ( ! "%' 030;07 $. !$. ! "%' . $ & '"*! $ *$)*! # $ !! $
(* * (* )* $ ( ( ' 0 (420@0 <0B4<0B8A ?4@=G0B00= B4@A41CB
38BC;8A A410608 14@8:CB

J

&030 &34".""/ < 030;07 :0?0A8B0A :0;>@ :0; I 0B0C !
)4@30?0B ?4@14300= ?4=64@B80= 0=B0@0 :0?0A8B0A :0;>@ 30= :0;>@ 94=8A
B4B0?8 A420@0 <0B4<0B8A :43C0=G0 <4<8;8:8 7C1C=60= A410608 14@8:CB
0@8 &34".""/ < 30= &34".""/ < 38?4@>;47

#
# J
!4B4@0=60=
# <0AA0 H0B :6 :0;>@ 94=8A :6I

4. Hukum Kekekalan Energi untuk Kalor
=30 B4;07 <4<?4;090@8 107E0 4=4@68 B830: 30?0B 3828?B0:0= 30=
B830: ?4@=07 <CA=07 B4B0?8 4=4@68 30?0B 14@C107 14=BC: 30@8 A0BC 14=BC:
4=4@68 :4 14=BC: 4=4@68 ;08= (410608 2>=B>7 4=4@68 <4:0=8: 30?0B
14@C107 <4=9038 4=4@68 ;8AB@8: !4<C380= 4=4@68 ;8AB@8: 30?0B 14@C107
;068 <4=9038 4=4@68 2070G0 30= A4B4@CA=G0 4<8:80= 9C60 4=4@68 30;0<
14=BC: :0;>@ 14@0A0; 30@8 14=BC: 4=4@68 ;08=

Kalor 149