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Type: Posts; User: mathman

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by mathman
Replies
33
Views
3,164

### The statement is confusing. Firing a bullet will...

The statement is confusing. Firing a bullet will add momentum to the machinegun + satellite in the opposite direction from the bullet.
2. ## Thread: capacitors in series and parallel

by mathman
Replies
2
Views
1,903

### This should be in classical physics, not quantum...

This should be in classical physics, not quantum physics.
3. ## Thread: Explaining simple harmonic motion

by mathman
Replies
4
Views
1,147

### Simple harmonic motion - Wikipedia, the free...

Simple harmonic motion - Wikipedia, the free encyclopedia

Try the above.
4. ## Thread: What is velocity of the 2 kg block immediately before the collision?

by mathman
Replies
40
Views
2,055

To xox. You made a mistake in your 11:26 pm post. m1 = 2, not 1.

The 2 kg block starts out at .7 and ends at 0.
5. ## Thread: What is velocity of the 2 kg block immediately before the collision?

by mathman
Replies
40
Views
2,055

### Write down the equations for conservation of...

Write down the equations for conservation of energy and conservation of momentum. (The problem is one dimensional). The two unknowns are the before and after velocities of the 2 kg. block. The...
6. ## Thread: Trying to understand Transformer Power calculations in this patent

by mathman
Replies
11
Views
1,283

### In general V=IR.

In general V=IR.
7. ## Thread: Brown Dwarf accretion

by mathman
Replies
3
Views
926

### It is possible.

It is possible.
8. ## Thread: On negative energy(unobservable gravitational potential energy)

by mathman
Replies
11
Views
1,208

### Gobbledegook.

Gobbledegook.

by mathman
Replies
1
Views
829

no
10. ## Thread: Dirac and Anderson

by mathman
Replies
21
Views
1,386

### This is a major open question in current physics....

This is a major open question in current physics. Specifically the big bang should have produced an equal amount of matter and anti-matter. What happened to the anti-matter? There is no solid...
11. ## Thread: What is boson higgs?

by mathman
Replies
6
Views
2,722

### Higgs boson - Wikipedia, the free encyclopedia...

Higgs boson - Wikipedia, the free encyclopedia

Try above.
12. ## Thread: How do we know that black holes form?

by mathman
Replies
60
Views
3,216

### Time dilation is what a distant observer sees. ...

Time dilation is what a distant observer sees. Locally time passes normally.

by mathman
Replies
2
Views
785

### It takes 80 calories to melt 1 gram of ice. The...

It takes 80 calories to melt 1 gram of ice. The water/ice ratio depends on the amount of heat (cooling) applied.
14. ## Thread: Gravity and particles are not the same thing?

by mathman
Replies
5
Views
964

### Gravity is a force, not energy.

Gravity is a force, not energy.

by mathman
Replies
2
Views
955

### A proton is not an elementary particle. An...

A proton is not an elementary particle. An electron is.

by mathman
Replies
4
Views
807

### Ignite in what sense - chemical or nuclear...

Ignite in what sense - chemical or nuclear fusion? In either case the answer is no.
Chemical - the gas giants are mainly H and He. To ignite you need O, which you don't have in any significant...
17. ## Thread: Black hole eventually turn into Whitehole ?

by mathman
Replies
1
Views
976

### It is probably too early to tell. New theories...

It is probably too early to tell. New theories in science go through several stages. Proposal, analysis by peers to see it makes sense, comparison with existing observations, design of crucial...
18. ## Thread: Physics Philosophy - Dark Matter

by mathman
Replies
6
Views
1,009

### From what I've read, MOND is seriously flawed.

From what I've read, MOND is seriously flawed.
19. ## Thread: Galaxies moving away from us at speeds greater than the speed of light.

by mathman
Replies
18
Views
1,236

### We don't detect them. We "know" they are there...

We don't detect them. We "know" they are there based on cosmological model.
20. ## Thread: Galaxies moving away from us at speeds greater than the speed of light.

by mathman
Replies
18
Views
1,236

### We don't see them and their light never gets here.

We don't see them and their light never gets here.
21. ## Thread: probability in computer hearts

by mathman
Replies
0
Views
1,452

### probability in computer hearts

I just completed a game of hearts on the computer (Microsoft version). The game took four hands, the absolute minimum. All four hands were moon shots. I made two and two other players each made...
22. ## Thread: How much more evidence does one need?

by mathman
Replies
6
Views
1,246

### up quark mass = 2.3{+0.7−0.5} MeV down quark...

up quark mass = 2.3{+0.7−0.5} MeV
down quark mass = 4.8{+0.5−0.3} MeV

As you can see these masses are very imprecise, so playing number games is meaningless.
23. ## Thread: The total mass of the up and down quark=7.2, and 7.2*DE=4.9

by mathman
Replies
7
Views
1,242

### up quark mass = 2.3{+0.7−0.5} MeV down quark...

up quark mass = 2.3{+0.7−0.5} MeV
down quark mass = 4.8{+0.5−0.3} MeV

As you can see these masses are very imprecise, so playing number games is meaningless.
24. ## Thread: The total mass of the up and down quark=7.2, and 7.2*DE=4.9

by mathman
Replies
7
Views
1,242

### The numbers will be different.

The numbers will be different.
25. ## Thread: The total mass of the up and down quark=7.2, and 7.2*DE=4.9

by mathman
Replies
7
Views
1,242

### The numbers you are using for the quark masses...

The numbers you are using for the quark masses depend entirely on the units. You could use atomic mass units, mutiples of electron mass, grams, or ounces and you will have different numbers. Your...
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