A sphérical báll of salt is dissolving in water in such a manner that the ráte of décrease of the volume at any iñstant is propôrtional to the surface. Prove that the radius is decréasing at a coñstant rate.
Answers
Answered by
1
Answer:
Here
P=
20,000
Rs.,
n=
3
years,
R=
8
Amount (A)=
P
(1+
100
R
)
n
=
20000
(1+
100
8
)
3
=
20000
(
25
27
)
3
=
25×25×25
20000×(27)
3
=
25
32×(27)
3
=
25,194.24
Rs.
Compound interest
(C.I)=
A−
P=
25,194.24−
20,000=
5,194.24
Hence, the compound interest is Rs. 5,
Answered by
3
Answer:
According to the question
d t
d V
= K×(surface area)
V=
3
4
πr
3
,SA= 4πr
2
dt
d (
3
4
πr
3
)
= K× 4πr
2
3
4π
dt
dr
3
= 4πKr
2
3
4π
× 3r
2
×
dt
dr
= 4πKr
2
dt
dr
= K
Hence true.
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