the temperature of a body falls 26°c. find the final temperature of the body of its initial temperature is 17°c.
Answers
Answered by
1
Step-by-step explanation:
Here,
Initial temperature (T
i
)=80
∘
C
Final temperature (T
f
)=50
∘
C
Temperature of the surrounding (T
0
)=20
∘
C
t=5 min
According to Newton's law of cooling,
Rate of cooling
dt
dT
=K[
2
(T
i
+T
f
)
−T
o
]
t
(T
f
−T
i
)
=K[
2
(80+50)
−20]
5
80−50
=K[65−20]
6=K×45
K=
45
6
=
15
2
In second condition,
initial temperature =T
i
=60
∘
C
Final temperature T
f
=30
∘
C
Time taken for cooling is t
According to Newton's law of cooling
t
(60−30)
=
15
2
[
2
(60+30)
−20]
t
30
=
15
2
×25
t
30
=
15
50
=
3
10
∴t=9 min
Answered by
1
Answer:
nothing don't know
Step-by-step explanation:
but i know 5 + 5
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