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Question 2 The figure on the left shows the overhead view of a small coin ( can be considered as a point ) on top
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The figure on the left shows the overhead view of a small coin can be considered as a point on top of a
circular table of radius meter. The coin is at a distance of meter from the center of the
circular table. The table rotates with an angular acceleration of Initially at time
the table had an angular speed of clockwise and had an initial angular position of with respect
to a reference line. Interpret clockwise speed as negative and anticlockwise speed as positive. The figure
on the right shows a small puck of mass grams rotating on a frictionless table. It is connected to
an ideal rope that passes through a hole and is connected to a cylinder of mass Here is
meter.
a Calculate the angular speed and angular position of the coin with respect to the reference line as a
function of time and hence at time second.
b Does the coin change it's direction or rotation at some time? If yes, when? Calculate the number of
complete rotations that the coin complete up to that time.
c Calculate the angular speed of the puck for which the cylinder does not fall downwards. Hint: The
tension force will provide necessary centripetal acceleration here.
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