Tuesday, September 14, 2010
Ch4_2 #1
See Ch 4 Sheets 16,17,18 for the Apparent Weight of on object. You don't have to convert the "lb" into SI units. When you set up the ratio the apparent weight when the elevator accelerates over the apparent weight when the elevator is at rest the units of the weight drop out. How about the mass m ? Solve the resulting equation for the acceleration.
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7 comments:
i dont understand how to do this if the mass isnt given
for mass you have to find the differences betweenthe weight at rest and the weight when the elevator is in motion.
How do u get the mass? 170-150? or 150-120?
this course sucks
i have zero idea how to do this problem - how are you supposed to go about figuring this out? the rest were simple
To find the mass of the person in the elevator convert the weight at rest (150lbs) into Newtons. Next plug the weight into the formula w=m(g-a). The elevator is at rest so a=0.
http://www.answerbag.com/q_view/831847
I don't know how our professor is trying to explain things on the "help blog," but I found this WAY more helpful and direct.
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