Recent content by rleung3

Ohh! Thank you. Yea, I am definitely rusty at this..has been a while.

Hey, I have been thinking about this problem for a while to no avail. Any input would be greatly appreciated. Thanks! Homework Statement A solid sphere of mass M and radius R rolls without slipping down a 30 degree incline (see figure attached). What is the linear acceleration, a...

Thanks so much OlderDan. So, the thing I am still confused on now is...can you look at the diagram on the left and automatically "translate" it into the diagram on the right-hand side? The book gives off the impression that you can, but I am confused as to how. Thanks again. Ryan

Hmmm, nope, there isn't any equation that describes a vector for precession.

Hi, It asks me to state whether the direction of the gyroscope precession is clockwise or counterclockwise (see attachment). I am confused as to how they determined from the top view (on the left) that the direction of angular velocity and angular momentum were pointing towards the left...

So what you're saying is that usu., we don't need to take work by tension into consideration when dealing with problems where a mass is lowered from a pulley system? I knew we could ignore work due to tension if we had a pulley with a mass on each side, since the tensions cancel each other out...

Hmmm...I see what you're trying to get at, but I am still not sure how it helps. Mainly, I am not even too sure what the target variable is (as in how to get it into an equation). One thing I forgot to mention is that we also know the acceleration (a). These are the known values: mass of...

A bucket of water of mass m1 is suspended by a rope wrapped around a windlass, that is a solid cylinder with diameter d with mass m2. The cylinder pivots on a frictionless axle through its center. The bucket is released from rest at the top of a well and falls a distance h to the water. You...

Hmm, that is definitely not what they do here. Are they just purposely ignoring it? Here is the problem: Two metal disks, one with radius R1 and mass M1 and the other with radius R2 and mass = M2 , are welded together and mounted on a frictionless axis through their common center...

Hi, When you hang a mass on a pulley and allow the mass to fall, do you normally have to take into account the work due to tension in the equation U1 + K1 - W(tension) = U2 + K2? I laways thought you did, but it doesn't take W(tension) into account in one of my problems. Thanks so much...

No, it does not...

Hi, When you compress a spring and release it (allowing object to spring some distance), to compute the work done by friction, your s term in W=Fs would have to equal the distance that the spring is compressed + the additional distance traveled by the object once it leaves the spring, right...

OOHH! Nevermind..it wanted the answer in km and I put it in m. Stupid me!

I put in 1159 m (1.33x10^6 J)/(117g). It usually leaves room for errors up to 10%.

An airplane propeller is 2.08 m in length (from tip to tip) with mass 117 kg. The propeller is rotating at 2400 rev/min about an axis through its center. Its rotational kinetic energy is 1.33x10^6 J. If it were not rotating, how far would it have to drop in free fall to acquire the same...