bem
Oct21-04, 11:35 PM
my pre-test has a question: "A man is standing on a balance scale which reads 80kg. Suddenly, he quats with a n acceleration a (downward). What weight does the scale read while the man is squatting?
(A)the same (B) more than 80kg (c) less than 80kg
I chosed (b)
because before we have N=mg
then after the man squatting N=m(g+a)
so the scale has to read more than 80kg. But then one of my friend said that N=m(g-a). I'm just confused. Can smbd help me ? I have a bet with him ( 10 bucks, hehe).
(A)the same (B) more than 80kg (c) less than 80kg
I chosed (b)
because before we have N=mg
then after the man squatting N=m(g+a)
so the scale has to read more than 80kg. But then one of my friend said that N=m(g-a). I'm just confused. Can smbd help me ? I have a bet with him ( 10 bucks, hehe).