A solid ball of radius 0.4 meters, made from a material of density 1.7 kG/cubic meter, rolls along a rough horizontal plane with a speed of 11.1 meters/sec. What is its angular momentum (in Joule.secs)?(adsbygoogle = window.adsbygoogle || []).push({});

density = mass/volume and volume of a sphere = (4/3)(pi)(r)^3

so the mass is 0.4557kg

I=(2/5)MR^2 ---> (2/5)*0.4557*(0.4)^2 = 0.02917

w=v/r ---> 11.1/0.4 = 27.75

L=Iw ---> 0.02917*27.75 = 0.809

Student response 0.809

Correct answer 2.83

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: HELP:moment of inertia/angular momentum

**Physics Forums | Science Articles, Homework Help, Discussion**