Question

Four objects—a hoop, a solid cylinder, a solid sphere, and a thin, spherical shell—each have a...

Four objects—a hoop, a solid cylinder, a solid sphere, and a thin, spherical shell—each have a mass of 4.06 kg and a radius of 0.253 m.

(a) Find the moment of inertia for each object as it rotates about the axes shown in this table.

hoop     ___ kg · m2
solid cylinder     ___ kg · m2
solid sphere     ___ kg · m2
thin, spherical shell     ___ kg · m2


(b) Suppose each object is rolled down a ramp. Rank the translational speed of each object from highest to lowest.

a) solid cylinder > thin spherical shell > solid sphere > hoop

b) solid sphere > solid cylinder > thin spherical shell > hoop     

c) hoop > solid cylinder > solid sphere > thin spherical shell

d) thin spherical shell > solid sphere > solid cylinder > hoop


(c) Rank the objects' rotational kinetic energies from highest to lowest as the objects roll down the ramp.

a) solid cylinder > thin spherical shell > solid sphere > hoop

b) hoop > thin spherical shell > solid cylinder > solid sphere    

c) hoop > solid cylinder > solid sphere > thin spherical shell

d) thin spherical shell > solid sphere > solid cylinder > hoop

Homework Answers

Answer #1

a) moment of inertia of hoop = M R2 = 4.06 * 0.2532= 0.259 kg.m2

moment of inertia of solid cylinder = 1/2 M R2 = 1/2 * 4.06 * 0.2532= 0.129 kg.m2

moment of inertia of solid sphere = 2/5 M R2 = 2/5 * 4.06 * 0.2532= 0.104 kg.m2

moment of inertia of thin spherical shell = 2/3 M R2 = 2/3 * 4.06 * 0.2532= 0.173 kg.m2

b) b) solid sphere > solid cylinder > thin spherical shell > hoop

c) b) hoop > thin spherical shell > solid cylinder > solid sphere   

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