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WAEC Physics 2011 Paper
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© africaexams.com
Question : 21
Total: 49
A metal of mass 200g at a temperature of 100
o
C is placed in 100g of water at 25
o
C in a container of negligible heat capacity. If the final steady temperature is 30
o
C, calculate the specific heat capacity of the metal. [specific heat capacity of the water is 4200 Jkg
-1
K
-1
]
150 Jkg
-1
K
-1
300 Jkg
-1
K
-1
320 Jkg
-1
K
-1
1960 Jkg
-1
K
-1
Validate
Solution:
MC
θ
metal
= MC
θ
w
a
t
e
r
0.2 x C x 70 = 0.1 x 4200 x 5
C = 150
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