Call the plants radius r and suppose

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Unformatted text preview: increases.
 
 Someone
 performing
 hard
 labor
 for
 10
 hours
 a
 day
 might
 need
 about3500
 kcal
 of
 food
 per
 day.
 
 Suppose
 the
 person
 does
 mechanical
 work
 at
 a
 steady
 rate
 of
 50W
 over
 10
 hours.
 
 We
 can
 define
the
body’s
efficienty
as
the
ratio
of
mechanical
work
done
to
excess
energy
 intake
(beyond
the
BMR
calculated
in
(b)).

Find
this
efficiency.
 
 1.4

Earth’s
temperature
 The
Sun
emits
energy
at
a
rate
of
about
 3.9
·
1026
W.

At
Earth,
this
sunshine
gives
an
 incident
energy
flux
Ie
of
about
1.4kW
m‐2.

In
this
problem,
you’ll
investigate
whether
 any
other
planets
in
our
solar
system
could
support
the
sort
of
water‐based
life
we
 find
on
Earth.


 
 Consider
a
planet
orbiting
at
a
distance
 d
from
the
Sun
(and
let
 de
be
Earth’s
 distance).
 The
 Sun’s
 energy
 flux
 at
...
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