這是聯合班的半期考試題節選（今天下午新鮮出爐的！），相信有耐心看在下的小說的各位會覺得簡單了一點。權當是練洋文吧。1. A meter
stick is
held
vertically
with one
end on the
floor and
is then
allowed to
fall。 Find
the speed
of the
other end
when it
hits the
floor，
assuming
that the
end on the
floor does
not slip。
2. The
gravitation
field
associated
with the
earth is
zero at
both
infinity
and at the
center of
the earth。
Is the
gravitational
potential
also zero
at each
place？ Is
it indeed
the same
at each
place？
3. Do the
center of
mass and
the center
of gravity
coincide
for a
building？
For a
lake？
Under what
conditions
does the
difference
between
the center
of mass
and the
center of
gravity of
a body
become
significant？
…
5. A book
rests on a
table。 the
table
pushes up
on the
book with
a force
just equal
to the
weight of
the book。
Speaking
loosely，
just how
does the
table