P2 Tutorial 1 Solutions

Howfardidherowupstream solution

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Unformatted text preview: mowing
speed
of
the
second
machine
is
A/20,
so
 that
of
the
first
one
is
2*A/20=A/10.
 Let
the
total
time
working
together
be
T.

 Then
(A/20)T+(A/10)T=A
 This
implies
that
the
required
time
is
A/(A/20+A/10)
=
6.7
minutes.
 
 Physics
2
Tutorial
1
 9/28/2011
 Fall
2011
 
 
 4. Store
bought
gold
contains
gold
and
other
materials
(such
as
copper).
The
purity
 of
gold
is
referred
to
as
carat
purity
and
it
is
defined
as
carat
purity
=24
(mass
of
 actual
gold)/(total
mass
of
store
bought
gold).
If
a
38.5
gram
gold
ring
is
18.0
 karat,
then
what
is
the
mass
of
material
other
than...
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