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Lma12684

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## Homework Statement

A uniform solid sphere, with diameter 28 cm and mass 2.5 kg, rolls without slipping on a horizontal surface, at constant speed of 2.0 m/s.

1) What is the rotational kinetic energy?

2) What is its total kinetic energy?

3) What is its angular momentum?

## Homework Equations

1) KE=1/2 Iw^2

2) KE=1/2 Mv(cm) + 1/2*I(cm)*w^2

3) L=Iw

## The Attempt at a Solution

1) KE=1/2(2/5MR^2)(v/r)

=1/2(19.6)(.14)

=1.372

2) KE=1/2 (2.5)(2.0)+ 1/2 (19.6)*(.14^2)

=2.69

3) L=(19.6)(.14)

=2.744

Does this solution look good? Thanks.