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Physics
Physics
Problem
The mass density of a spherical body is given by
ρ
(
r
)
=
k
r
\rho(r) = \frac{k}{r}
ρ
(
r
)
=
r
k
(for
r
≤
R
r \leq R
r
≤
R
) and
ρ
(
r
)
=
0
\rho(r) = 0
ρ
(
r
)
=
0
(for
r
>
R
r > R
r
>
R
), where
r
r
r
is the distance from the centre. The correct graph that describes qualitatively the acceleration,
a
a
a
, of a test particle as a function of
r
r
r
is :
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