
#1
Oct1308, 10:18 PM

P: 7

1. A 75g phonograph album of 30cm diameter spins at 33.3 rpm. What is its kinetic energy?
2. 1/2mv^{2} 3. well i think that kinetic energy is 1/2mv^{2} so is it like that but instead of v you put in the 33.3 rpm. like 1/2(75)(33.3)^{2} maybe? 



#2
Oct1308, 10:22 PM

P: 328

[tex] K_e = \frac{1}{2}I\omega^2 [/tex]
You have to use omega as radians per second, mass has to be in kilograms. 


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