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Type: Posts; User: zeke

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1. ## Thread: Moment of Inertia Hat Section

by zeke
Replies
5
Views
4,829

### "I did break it up in to smaller rectangles and...

"I did break it up in to smaller rectangles and did the calculation, but want to cross check it if there is a formula."

I'm puzzled. Do you have the reference axis for the calculation. And how...

by zeke
Replies
4
Views
7,565

### Judging from the fundamental questions you are...

Judging from the fundamental questions you are asking, you need a fundamental understanding
of Newton's equations .
You should either crack a book or get a tutor to give you that help...

by zeke
Replies
2
Views
4,188

### This problem can be solved most proficiently by...

This problem can be solved most proficiently by using energy methods. Unless you are unfamiliar with that approach, and depend on classical methods, you are in for a long calculation.

If this is...

by zeke
Replies
2
Views
1,387

### Dave Pinkerton

Has anybody heard from Dave lately?
5. ## Thread: Help needed on a gear/cog project

by zeke
Replies
2
Views
1,315

### Can't seem to open your files.

Can't seem to open your files.
6. ## Thread: System resonance revisited

by zeke
Replies
6
Views
4,729

### I answered this a few days ago and apparently...

I answered this a few days ago and apparently something went wrong with the transmission.

To paraphrase, your understanding of power is incorrect.
Power is NOT A^2/2.
If A is voltage, Vsinwt ...
7. ## Thread: Deflection Curve of a Compound Spur Gear Shaft

by zeke
Replies
2
Views
1,690

### Not the way you are doing it. For one thing, even...

Not the way you are doing it. For one thing, even if you wrote the equations correctly, you have a mess to unravel the the constants .[BTW, your equations are written incorrectly. When you change...
8. ## Thread: System resonance revisited

by zeke
Replies
6
Views
4,729

### From your posts: 1)"The average signal power...

1)"The average signal power coming in is A^2/2, and the average signal power coming out is 25*A^2/2"

2).."believe in the case of a mechanical structure, the output force is 5...
9. ## Thread: System resonance revisited

by zeke
Replies
6
Views
4,729

### Wrong, as the Q gets larger the amplitude and the...

Wrong, as the Q gets larger the amplitude and the velocity get larger in the same proportion.
What you need to do is write the ODE and solve it for the harmonic input. The input power is F*x', but...

by zeke
Replies
1
Views
1,205

### 1- colder than the saturation temperature of 38...

1- colder than the saturation temperature of 38
3- you mean condensing water and you would have to get a heat exchanger large enough to do it
and use the coldest water available.
11. ## Thread: System resonance revisited

by zeke
Replies
6
Views
4,729

### Explain exactly what the system is and where you...

Explain exactly what the system is and where you get an output energy.
Also in the system you describe , for example anLRC circuit,where w=wn, the current is in phase with the voltage.
For the...

by zeke
Replies
6
Views
1,751

### Well, did you solve it?

Well, did you solve it?
13. ## Thread: Oil Flow Rate

by zeke
Replies
3
Views
1,343

### You are too coddled. Why don't you spend a few...

You are too coddled.
Why don't you spend a few minutes to Google "flow of viscous fluid through an orifice"
I'll bet you will get at least 10 promising hits.
14. ## Thread: Oil Flow Rate

by zeke
Replies
3
Views
1,343

### Size of opening and distance between opening and...

Size of opening and distance between opening and top of tank are needed

by zeke
Replies
6
Views
1,751

### Ok, you twisted my arm TAN@=(5-COS@)/(10-SIN@)...

Ok, you twisted my arm

TAN@=(5-COS@)/(10-SIN@)

I trust you can do the res

by zeke
Replies
6
Views
1,751

### Pretty simple problem, but we don't do homework...

Pretty simple problem, but we don't do homework here.
BTW, why would you need 6 place accuracy?
17. ## Thread: Real World Beam Failure Analysis

by zeke
Replies
34
Views
7,850

### "Ok, fair enough. But I'm showing that it would...

"Ok, fair enough.
But I'm showing that it would take well over 200,000 pounds of force to bend a schedule 40 pipe 3/4 of an inch over a span of 10 inches.

(I=.3)

Does that sound right?"

...
18. ## Thread: Mini-crane (aka engine hoist) design.... strength questions

by zeke
Replies
3
Views
4,851

### Dumbdumb, This is not a job for an amateur. ...

Dumbdumb,

This is not a job for an amateur.

Go get a professional to do this or you risk killing yourself or others.
19. ## Thread: Real World Beam Failure Analysis

by zeke
Replies
34
Views
7,850

### "Ok, fair enough. But I'm showing that it would...

"Ok, fair enough.
But I'm showing that it would take well over 200,000 pounds of force to bend a schedule 40 pipe 3/4 of an inch over a span of 10 inches."

You were assuming elastic deformation...
20. ## Thread: Real World Beam Failure Analysis

by zeke
Replies
34
Views
7,850

### "The load is a self-climbing chain motor, with a...

"The load is a self-climbing chain motor, with a load attached under that.
The chain motor capacity is nominally 1 ton (2000 pounds),
with a brake capacity of (typically) 2-3 times that."

The...
21. ## Thread: Bolt torque vs clamping force

by zeke
Replies
6
Views
82,474

### "The boss' design team says, "If you have a...

"The boss' design team says, "If you have a 1/4-20 bolt, one revolution moves the nut .05 inches. If 44 lbs is applied at a radius of 1 inch (44 inch lbs), the force has to move 2 x pi inches or...
22. ## Thread: Real World Beam Failure Analysis

by zeke
Replies
34
Views
7,850

### "On a recent theatrical show, during the...

"On a recent theatrical show, during the "load-out",
it was noted that a "beam" failed sometime during the show."

23. ## Thread: Which Engineering Profession Pays the Most?

by zeke
Replies
18
Views
4,868

### "Mean" salaries are meaningless.

"Mean" salaries are meaningless.
24. ## Thread: High Torque Application - Thinking of using cam - need some advice

by zeke
Replies
4
Views
1,526

### The cam isn't a bad idea but you would need...

The cam isn't a bad idea but you would need braking to hold a position and would be less precise than the linear solution proposed by the others.
25. ## Thread: Definite and Indefinite Integrals

by zeke
Replies
4
Views
3,100

### How is this not homework? small hint ..for...

How is this not homework?

small hint ..for prob1

cos(x)dx=?

small hint for problem 2
Draw a right triangle and enter u and use trig functions
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