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July 25, 2014

Homework Help: AP Physics B

Posted by AP Physics B on Sunday, September 13, 2009 at 8:42pm.

can you check my reasoning

1. The problem statement, all variables and given/known data

ok well then...

we did a lab were you have a hanging mass attached to a stirng that went through a straw and was attached to a rubber stopper. The lab was to find the mass of the rubber stopper once you know the velocity. So I was woundering if this looks correct

2. Relevant equations

f = ma
m1 = mass of stopper
m2 = mass of hanging mass

radial acceleration = r^-1 v^2

3. The attempt at a solution

net force radial = m (acceleration radial) = force of gravity on mass m2
net force radial = (m1 + m2) (acceleration radial) = m2 g
net force radial = m1(acceleration radial) + m2 (acceleration radial) = m2 g
net force radial = m1(acceleration radial) = m2 g - m2 (acceleration radial)

divided both sides by acceleration radial

m1 = (acceleration radial)^-1 ( m2 g - m2 (acceleration radial) )

at which point I plugged in the value I found for the radius
the value I found for the period
and found the radial acceleration

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