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Physics
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Asked: Apr 19th, 2017
Question description
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1. Calculate the moment of inertia I for the following objects:
a. A rod of length L with density and axis of rotation in the center of
the rod. 0 is define to be at the center of the rod.
b. A solid disc of radius R with axis of rotation at its center and density
2. Find the period of a physical pendulum with the following shapes: (Hints: The moment of
inertia for two objects attached to each other can be calculated by individually calculating
their moments of inertia and adding them together. You will need to use the parallel axis
theorem in this problem.)
a. A thin rod of length L and mass m with a solid disc of radius L/4 and mass m
centered at the end. The axis of rotation is at the end of the rod opposite the solid
disc.
b. A thin rod of length L and mass m with a hoop of radius L/4 and mass m centered
at the end. The axis of rotation is at the end of the rod opposite the hoop.
c. Which shape has the larger period? Explain why your answer makes sense
conceptually.
3. Sarah is riding on the carousel. The carousel rotates clockwise when viewed from above.
The carousel is coming to a stop, so it is slowing down. Sarah is in the northwest
quadrant.
a. Draw vectors for , , and ′ when the carousel is viewed from above.
b. Use the right hand rule to determine the directions of the transverse force and the
centrifugal force.
c. Use formal vector calculations to determine the directions of the transverse force
and the centrifugal force.
d. Do your answers for (b) and (c) agree? Explain why your answers make sense
conceptually.
4. Suppose you set up the kiddy pool experiment as conducted in Veritasium and
SmarterEveryDay. You set up your kiddy pool in Commerce, which is at a latitude of 33°
N. You have a friend in Mexico City, which is at a latitude of 19° N.
a. In which city would you expect the Coriolis force to be stronger? Explain your
reasoning. (Hint: The component of the velocity which is perpendicular to
varies with latitude.)
b. Is the centrifugal force from the Earth’s rotation larger for you or your friend?
Explain your reasoning. (Hint: ′ varies with latitude.)
Tags:
velocity
moments of inertia

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