Recent content by sfsy1

max \mus is always larger than \muk. i think it's proven experimentally, but why exactly is this so?

thanks, very detailed workings.

A ball is rolled down a smooth ramp, that curls upwards. Where will the ball lose contact with the surface? According to the conservation of energy law, the ball is able to reach its original height, which means the ball should stop at A. However, after the ball passes point B, won't the...

i think u should use an illustration to show how are the tanks connected

shouldn't they be drained at the same rate?

The change in GPE is (sin45)Lgm, not 0.5Lgm.

Why do they have to sag? I thought there's tension?

The weight of the object doesn;t affect upthrust, they are 2 different forces. And no upthrust will not be the same because the density of the fluid changed. As said in the previous post, it's the volume of the object (i.e. the amount of fluid displaced) and the density that matters.

thanks for your help!

but anyway, i think i understand it now, thanks!

sorry the diagram is unclear, but the X is different for the first case, and the second case, N is the same.

[PLAIN]http://img444.imageshack.us/img444/8218/diagram.gif to calculate the torque (N*x) which one is correct? the one on top, or below.

The gravitational constant, G, as its name implies, is always constant. However in reality, there are many other factors that influences the net pull on an object, such as the non-uniform density of the Earth, imperfect spherical shape of the Earth and even the gravitational pull from other...

Some stars move at speeds that should rip the galaxy apart; there is not enough measured mass to supply the gravity needed to hold the galaxy together. These high rotational speeds suggest that the galaxy contains more mass than was calculated. Scientists theorize that, if the galaxy was...

thanks