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huybinhs
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Homework Statement
Four point masses are arranged on the xy plane as follows.
Mass1 = 27.0 grams at x = 2.00 cm and y = 2.00 cm.
Mass2 = 31.0 grams at x = 0.00 cm and y = 4.00 cm.
Mass3 = 49.0 grams at x = -3.00 cm and y = -3.00 cm.
Mass4 = 31.0 grams at x = -1.00 cm and y = 2.00 cm.
a) What is the rotational inertia if this collection of masses is rotating about the x axis?
b) What is the rotational inertia if this collection of masses is rotating about the y axis?
c)What is the rotational inertia if this collection of masses is rotating about the z axis?
Homework Equations
I = mr2
The Attempt at a Solution
I need to change to the right units:
Mass 1 = 0.027 kg at x = 0.02 m and y = 0.02 m
Mass 2 = 0.031 kg at x = 0.00 m and y = 0.04 m
Mass 3 = 0.049 kg at x = -0.03 m and y = -0.03 m
Mass 4 = 0.031 kg at x = -0.01 m and y = 0.02 m
Now I know each mass, and converted to the right units. What should I do next? Thanks!