星期五的時候有發一張小張的題目
其中的第7題與第70題(最後一題)
有些不清與缺漏
完整的題目如下
7.
In Fig 8-33 a smail block of 
mass m =0.032 kg can slide 
along the frictuonless loop-
the-loop,with loop radius R
=12 cm.The block is released
from rest at point P,at height
h=5.0R abovethe bottom of the 
loop.How much work does the
gravitational force do on the
block as the block travels from
point P to (a) point Q and (b)
the top of the loop ? If the
gravitational potential energy
of the block-Earth system is
taken to be zero at the bottom 
of the loop,what is(c)at point
P,(d)at point Q,and(e)at the top 
of the loop ?(f) If,instand of
merely being released,the block
is given some initial speed 
down-ward along the track, do the 
answer to (a)throgh (e)increase
,decrease,or remain the same ?

70.
....................以上省略
(e)Knowing that the crate is
motionless before and after
its displacement,ues the
answers to (b),(c),and (d) to
find the work of your force
not equal to the product of
your force F does on the crate.
(f) Why is the work of your force
not equal to the product of the
horizontal displacement and the
answer to (a) ? 







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