what is the density

Other
Tutor: None Selected Time limit: 1 Hour

hidden
A
piece
of
rock
is
hanging
on
a
string
in
water
and
its
apparent
weight
is
 20 N .
Its
real mass
is
 3 kg .
What
is
the
density
of
the
material
the
rock
is
made
of?
Nov 19th, 2013
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Nov 19th, 2013

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Nov 19th, 2013
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Nov 19th, 2013
Dec 5th, 2016
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