Recent content by Chuck St. Lou

I have uploaded a diagram of two closed systems in which no work can or heat can be leave the system (See attached file). One is a free expansion of a gas into a vacuum and the other is a piston with the same gas on one side and a vacuum on the other side. After the piston is released and is...

If I understand this correctly then, in free expansion into a vacuum the molecules pass through the diaphragm and don't run into other molecules which would slow it down. No collisions, no loss of kinetic energy I.E. no change in temperature. Do I have this much right?

Yes it's true the same amount of energy is needed. You said weight is the same so let's say the cross section is the same. Rolling resistance the same I.E. same bike. Wind resistance the same I.E. same velocity. So yes the same energy needs to be applied at the pedals. The condition of the...

With a closed system no heat in or out, V1 with piston=V1 with diaphragm. Like wise V2 with piston = V2 with diaphragm. Because no heat goes in or out of the system the final state is the same for each system. The pressure on the redefined boundary is the same. Does it really matter how it...

The part I am having a problem with is that in this closed system i.e. no heat in or out same number of moles and ideal gas, if I move a piston in a cylinder so it can occupy V2 or I open the diaphragm so that the gas flows & is sucked in and occupies V2 in each case the net result is volume...

If the diaphragm had a small hole pricked in it would there be any temporary temperature change in a closed system such as this while the system is out of equilibrium?

So if I shoot a satellite either into deep space and out of the solar system never to return or hit another object or at the Sun in both cases the potential energy is lost. In our space time reference frame (here & now) there is a gain in energy by the one that is sent to the Sun and in the...

Hi turin If the energy came at the expense of gravitational potential energy what was spent or lost? Thanks for reply, Chuck

Gravity creates energy...Violation of the first law of thermodynamics? Two Identical metiorites traveling slowly through space happen to be on a vector that will cause them to collide with the earth. One is due to strike the Earth one week after the other. The first one comes in close to Earth...

Part of the mechanism for sandwich wraps to work is that when the plastic is pull away from the roll the static electricity, a negative charge, helps it to stick to the relatively positive containers etc.

That statement, by Walter, is absolutely false. Drop an apple on a lesser mass like the Moon and obviously the acceleration would be quite different from earth. He probably made a little slip. I like his videos.

What made me think of this was the famous question how fast does the force of gravity propagate if a mass could suddenly appear in space.

Scenario A very fine almost massless thread about 30 seconds at the speed of light long that can't stretch and can't break is strung out taut in a vacuum in space. It has a loop on one end. Suddenly Voyager 1 's as it passes by catches on the loop with it's antenna and gives it a tug. No part...

Your original Question; However, given that this explanation is correct, how would the car travel at constant speed since there's no backward friction and there is always a resultant force. With out some friction nothing will roll. Like a brick sitting on concrete, gravity is pushing...

Leroy Try this. Watch the dancer and shake your head back and forth briskly like as if to say no. Depending on how fast you oscillate back and forth the dancer will slow down, speed up, stop, and for you reverse.