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Home Q & A Board Science-Related Homework Help Physics
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rizza mae rizza mae
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11 years ago
A basketball of mass 125g is rolling without slipping along the horizontal surface of a table with a speed of 4.5 m/s when it rolls off the edge and it falls towards the floor,1.1 m below. What is the rotational kinetic energy of the ball just before it hits the floor?
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#1
11 years ago
I assume this is a homework problem, so I'm not going to just answer. How is regular/linear kinetic energy measured? What are the variables? What are the units of energy? The units are the same for rotational and linear (for any energy, for that matter). So how would you relate linear to rotational energy? What variables would you use for a rotational problem?
Hope that helps in a Socratic method sort of way!
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#2
11 years ago
I would be 2/5MR^2 for a sphere. Taking R=.15m
i=2/5*.125*.0225=.001125kgm^2

4.5 m/s=4.5/.15=30 rad/s=w
Rotational energy is
.5*Iw^2=.5*.001125*900=.506J
Duphis39
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