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Category > Physics Posted 08 Jul 2017 My Price 6.00

Pre-Lab Questions

Pre-Lab Questions
1. In this lab, you will be rotating a mass on one side of
a string that is balanced by a second mass on the other
end of the string (Figure 6). A free-body diagram will
show that the centripetal force on the rotating mass m1,
is provided by the weight of the hanging mass m2. Since
those forces must be equal, we can write the equation:
m2g = m1v2/r where v is the velocity of m1, and r is the
radius of its circular path. Since the magnitude of the
velocity is the average distance divided by the average
time, we can write the velocity = the circumference /
the period, or v = 2Ï€r/T where the period T is the time
to complete one revolution. Assume m2 = 4m1. Write an
expression for the period in terms of r and g. You
should find the mass terms will drop out. 2. The around the world yo-yo trick is completed by
twirling a yo-yo in a vertical circle. If the yo-yo was in uniform circular motion,
compare the force of tension at the top of the circle to the force of tension at the
bottom of the circle.
Hint: Drawing a free body diagram will be helpful. © 2014 eScience Labs, LLC.
All Rights Reserved

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SuperTutor
(15)
Status NEW Posted 08 Jul 2017 12:07 AM My Price 6.00

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