Can Energy Double?

http://en.wikipedia.org/wiki/Homework

Can energy double? If an iron ball weighting 10kg is placed on the edge of a table and let it drop pulling a toy car of the same weight from the top of the table, the frictional resistance of the car is 2kg. When the ball is about to reach the ground, the ball and the car both have the kinetic energy (10kg×10m－20)（20 by friction consumption), thus 100( potential energy) = 160(kinetic energy). During the whole process, the ball travels vertically from the table top to the ground, while the car travels horizontally from one end of the table top to the other. If the car is attached to a generator set on the edge of the table, the colliding force will makes it work. And the same is true with the ball.

Cobblers.

Maybe if your units were correct and you checked your maths you might find enlightenment.

G2

Is there an echo in the room? This sounds familiar...oh, just a repetition of the OP.

1. Check the formulae for Kinetic energy and potential energies.

2. Calculate the parameters of the formulae.

3. Assume frictionless surface (do not complicate the issue)

Come back with answer where you made the mistake.

http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion

Not really, the kinetic energy may double, but the potential energy is reduced to pay for it and for all the losses to wind resistance, friction and noise, etc..

Pick answer "C".

Any #1 student should know that if they are not going to do their homework then their best chance is to pick answer "C".

It really shouldn't be a surprise that Conservation of Energy is the principle applied to analyse systems like this.

Education these days. Bah!

"Education these days. Bah!"

And this guy's a self-proclaimed No1student at that. Imagine what the last student in the cohort must be like. For all you know the last student in the whole cohort is the only one who knows that the total sum of energy remains the same i.e. kinetic energy may appear to have doubled, but the loss of energy from friction etc added to the kinetic energy would equal the potential energy at the start of the experiment.

If bankers and financiers receive the kind of education that our OP here is, then that would certainly explain Bernie Madoff & the Lehman Brothers.

Experiment： Set a generator and an iron ball weighing 1kg at one edge of a table. Connect the ball with a toy car weighing 1kg placed at the opposite end of the table top. The distance between the ball and the car is 10m. Drop the ball. Pulled by the ball, the car travels from one end of the table top to the other, colliding with the generator to produce electricity. At the same time, the colliding force of the iron ball makes another generator set on the ground produce electricity, with approximately a half potion of which the ball would be lifted and the car pulled back. Thus the device would circulate on end. Friction=0.2kg, g=10 m/s2。 The accelerating speed of the iron ball and the car is: F=ma, F=G-f=1×10-2＝8N, a=F/m=8/1=8(m/s2) The end speed of the iron ball and the car is: Vt2=2as＝2×8×10＝160, Vt =40（m/s） The kinetic energy of the iron ball and the car is: Ek=1/2mvt2 ＝1/2×1×160＝80(J) The energy consumed to set the iron ball back in place. The energy consumed to set the car back in place is negligible.（At most， E=fs=2×10＝20J） Ep=GH＝10×10＝100（J） The energy gained: E=80×2－100＝60（J）。 To see the picture, please visit:http://zyaling.blogspot.com/

Do you have a Carriage Return on your keyboard? If you used it more often, it would make your points easier to read.

As it is, I can't be bothered to read in detail...oh hang on...this looks like perpetual motion bollox.

Bye.

Baloney. That doesn't work, either.

Just do it, then you'll know it's true.

I do not believe that, either. If it did work, then something was described incorrectly.

For example, what sort of "generator" works on a one-shot impact from some other object?

In a group of only one student, no doubt you would be "No. 1."

For example: you modify a generator and connect it to the rear wheel of a bike, when the ball hits the pedal of the bike, the generator works.

You can dig yourself into as deep of a pit as you like, I suppose.

If only some knowledgeable Chinese engineers/technologists would weigh in to these embarrassing threads....

http://www.lhup.edu/~dsimanek/museum/unwork.htm

You'll regret ten days later! , I swear!

Very well; we are now counting the days.

Regret what?

Ten

Nine

Eight

Seven

Six.....

Five.......

Four....

Three....

It's still cobblers.

You're too pride to win.