# Search:

Type: Posts; User: Jilan

Page 1 of 20 1

1. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### Funny as it is this is a physics forum. Does...

Funny as it is this is a physics forum. Does anyone still think there is merit in this 3:1 rule? I am worried that some people may still take it seriously! :eek:
2. ## Thread: To prove Special Relativity is wrong

by Jilan
Replies
8
Views
1,664

### Hi there, the time of the clock is only relevant...

Hi there, the time of the clock is only relevant to its inertial frame. I could have a different clock that initially was synchronised but later after a trip showed a different time. Which clock...
3. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### You pedal a bike but you peddle a myth. I got top...

You pedal a bike but you peddle a myth. I got top grades in English. :cool:
4. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### No, i was born in England of English parents,...

No, i was born in England of English parents, grandparents, great grandparents etc. What spelling mistake do you have an issue with!? i can correct it.
5. ## Thread: 2D projectile motion help

by Jilan
Replies
14
Views
975

### x0x is going to help you on this one. He's...

x0x is going to help you on this one. He's great on differential equations.
.:)
6. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### Sorry to remove one of your poison arrows for the...

Sorry to remove one of your poison arrows for the wounding of the vulnerable. I live in England.
7. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### What mis-spelling are you referring to? I will...

What mis-spelling are you referring to? I will correct it.
8. ## Thread: 2D projectile motion help

by Jilan
Replies
14
Views
975

### X0X, i'll gift this one to you, even though I...

X0X, i'll gift this one to you, even though I love these type of questions. (Reminds me my applied maths students in Hong Kong -bless you all whatever you are doing now!):)
9. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### X0X, however fast you back peddle this is not...

X0X, however fast you back peddle this is not going to turn out well. The OP had nothing to do with the maths you offered, under any circumstances.

(As a side issue I did get interested though...
10. ## Thread: 2D projectile motion help

by Jilan
Replies
14
Views
975

### Hi, Hani, welcome to the forum! Mayflow,...

Hi, Hani, welcome to the forum!

Mayflow, where is the 2D thing coming from?
I would supose that theta is the angle from the horizontal.

Hani, how far have you got on this problem, we cannot...
11. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### The impulse is generally the change in momentum.

The impulse is generally the change in momentum.
12. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### My concern is for the young minds on the forum...

My concern is for the young minds on the forum who might actually be swallowing the **** that X0X is coming up with.
13. ## Thread: Rollercoaster problem

by Jilan
Replies
37
Views
1,919

### Lexus, there seems to be many different types of...

Lexus, there seems to be many different types of accumulators and compressors. If you know what you need you could try contacting a company that make them? Most people are happy to help because one...
14. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### Yes, but I never came across anything in those...

Yes, but I never came across anything in those text books that failed to conserve energy. :eek:
For your equations to have validity the person being motivated would need to be responsible for...
15. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### So are you are really believing that is takes 3...

So are you are really believing that is takes 3 times the energy to recover momentum than to sustain it? :D
Or were you just playing?
16. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### I cannot follow your comments. I would not regard...

I cannot follow your comments. I would not regard the principle of the conservation of energy as a platitude.:rolleyes:
17. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### It's just the conservation of energy. How can the...

It's just the conservation of energy. How can the method of putting in the energy affect the energy required? However the energy is added, the energy put in must equal the energy dissipated. So...
18. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### There, I amended my post by one letter.... Does...

There, I amended my post by one letter.... Does it make sense now?
19. ## Thread: "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!

by Jilan
Replies
62
Views
2,646

### I have given this some thought and the 3X stuff...

I have given this some thought and the 3X stuff is nonesense (sorry X0X). The energy you have to put into a system to maintain the velocity is equal to the energy dissipated. If the energy dissipated...
20. ## Thread: Explaining simple harmonic motion

by Jilan
Replies
16
Views
1,007

### Might be worth a try when you get old and less...

Might be worth a try when you get old and less cute?
21. ## Thread: Spring Problem

by Jilan
Replies
8
Views
1,050

### Where I live (UK) the saying is "the wood from...

Where I live (UK) the saying is "the wood from the trees" but I think it has the same meaning. It doesn't have to do with mindsets. It's just about removing the noise and getting to the crux of the...
22. ## Thread: Explaining simple harmonic motion

by Jilan
Replies
16
Views
1,007

### Mayflow, you are thinking of speed. Speed is just...

Mayflow, you are thinking of speed. Speed is just speed. It is just a value. Velocity is different. It is a speed in a certain direction.
23. ## Thread: Explaining simple harmonic motion

by Jilan
Replies
16
Views
1,007

### If you are moving away from me we might say that...

If you are moving away from me we might say that the velocity is positive, but is you are moving towards me then that would be negative. Velocity is aways relative to an origin and has a direction....
24. ## Thread: Spring Problem

by Jilan
Replies
8
Views
1,050

### You don't have to. Just think of it as being an...

You don't have to. Just think of it as being an idealised spring. Perfectly springlike but weighing nothing. It can never be realised, but you can get close. These idealisations are important so we...
25. ## Thread: Explaining simple harmonic motion

by Jilan
Replies
16
Views
1,007

### Speeds are always positive! Velocities are...

Speeds are always positive! Velocities are different - there is a direction involved, it is a vector(like an arrow) and has a direction rather than just a value so depending on what angle you take...
Results 1 to 25 of 500
Page 1 of 20 1