Find the approximate kinetic energy of a circular wheel of radius r and mass M that is rotating about its center at 2 cycles/s. Assume the wheel’s mass is concentrated at the rim and the mass of the wheel’s spokes is negligible.

Explanation:

First we convert 2 cycles/s to angular velocity knowing that each circle has an angle of 2π

Then we calculate the moment of inertia of the cylindrical shell, assuming there's no mass inside the wheel (only at the rim):

So the kinetic energy of this is

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

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