Recent content by pucr

Homework Statement A turntable for playing records has a moment of inertia of 5.2 kgm^2 and is rotating with an angular velocity of 36 rpm. A record, initially at rest is dropped straight down onto the rotating turntable. The record and turntable rotate together at 33 rpm. Find the moment of...

I believe Al Gore's An Inconvenient Truth addresses some of these issues. Although, he does make the issue seem a little larger than it actually is. The Intergovernmental Panel on Climate Change(IPCC) is a group of scientists focusing on the issue. You might take a look at their website...

I have worked at MIT in a department that researches just this. It is a correlative effort between essentially all Ivy League Universities in the US and governments around the world. However, I am open to your argument if you can provide any evidence. If you want to teach your grandkids "true"...

You seem to be misinformed. There is no global warming "hoax". While plants do need CO2 to survive, the issue arises when there are not enough plants to use the CO2 we produce. The balance between animals and plants was lovely until humans began producing CO2 from fossil fuels, which otherwise...

Homework Statement A solid sphere has a mass of 1.0 kg. It is rolling at a translational speed of 10 m/s. What is the total energy of the rolling sphere? I think I got the problem but I'm not sure I went about it the right way. Homework Equations I = (2/5)mr^2 KE_rot = (1/2)Iw^2 KE =...

ooh thanks. It should be 3.487 rad/sec making the answer .0806 meters

Homework Statement A small coin is placed on a record that is rotating at 33.3 rpm. If the coefficient of static friction between the coin and the record is 0.1, how far from the center of the record can the coin be placed without having it slipped off? Homework Equations w = 33.3 rpm =...