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buffgilville
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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)?
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
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