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Type: Posts; User: CWH68

1. ## Question: Moment of inertia

by CWH68
2
Views
633

### Think Conservation of angular momentum. Compute...

Think Conservation of angular momentum. Compute the moment of inertia of the system before and after the student walked toward the center.
2. ## Question: Linear Equilation

by CWH68
2
Views
1,123

### Draw the Cartesian plane and paint every point (...

Draw the Cartesian plane and paint every point ( x, y) for which 2x + 3y = 0, say, blue.
3. ## Question: 1,5,23,85,271 nth sequence

by CWH68
4
Views
913

### There is a unique 4th degree polynomial P such...

There is a unique 4th degree polynomial P such that P(1) = 1, P(2) = 5, and P(n) would be the nth term of the sequence. Maybe that's it.
4. ## Question: Know title and lyrics. Who sang this song?

by CWH68
1
Views
1,240

### I finally found the answer to this question after...

I finally found the answer to this question after some extensive research. The song came out in 1984. The artist is:
Emile den Tex, and they are from the Netherlands.
I guess I stumped everyone,...
5. ## Question: Polynomial

by CWH68
1
Views
475

### Hint: Say p(x) = (x-s)q(x) + r(x), where deg(r)...

Hint: Say p(x) = (x-s)q(x) + r(x), where deg(r) < deg(x-s) = 1, which would mean that r(x) is a constant, say r0, so p(x) = (x-s)q(x) + r0.
Then, p(s) = 0*q(s) + r0 = r0, is the remainder.
6. ## Question: Differentiate: y=(x)^((x^x)) using dy/dx

by CWH68
1
Views
637

### ln(x^x) = x ln x, so x^x = e^(x ln x). Now, ln...

ln(x^x) = x ln x, so x^x = e^(x ln x). Now, ln (x^(x^x)) = (x^x) ln x
= (ln x)(e^(x ln x)). Thus, x^(x^x) = e^((ln x)(e^(x ln x))).
Thus, dy/dx = e^((ln x)(e^(x ln x)))*d/dx((ln x)(e^(x ln x)))...
7. ## Question: Suppose X has moment generating function mX(t) = (e^t -1)/t. Find EX

by CWH68
1
Views
547

### E(X) = mX'(0). Hint: Differentiate the Taylor...

E(X) = mX'(0). Hint: Differentiate the Taylor series expansion of
mX(t) at t=0.
8. ## Question: How to simplify trig expression?

by CWH68
1
Views
1,773

### Hint: cos(w) = sin(90-w)

Hint: cos(w) = sin(90-w)
9. ## Question: Physics

by CWH68
1
Views
692

### Differentiate v with respect to t. (a = dv/dt)

Differentiate v with respect to t. (a = dv/dt)
10. ## Question: Find the angle...

by CWH68
1
Views
618

### To show that angle KPA = angle KQA = 90 - angle...

To show that angle KPA = angle KQA = 90 - angle PAQ, note that PK is perpendicular to AQ and intersects AQ at, say, R. Similarly, QK is perpendicular to AP and intersects AP at, say, S. Triangles...
11. ## Question: Differentiability in R2

by CWH68
1
Views
1,827

### I think that they want you to prove that f(x,y)...

I think that they want you to prove that f(x,y) is differentiable on U, as it is not well-defined on all of R2. For example, what is f(3,4)?
12. ## Question: Question about eigenvalue problem

by CWH68
6
Views
1,270

### In this case, lambda = 0 is not an eigenvalue, as...

In this case, lambda = 0 is not an eigenvalue, as the only solution that corresponds to it is the trivial solution. The only real eigenvalue in this case is lambda = -(ln(2+sqrt(3)))^2. A...
13. ## Question: Two full 48-gallon tanks begin draining at t = 0. Tank Alpha's volume is changing at

by CWH68
1
Views
508

### Hint: The water in tank alpha is wa(t) = 48 -...

Hint: The water in tank alpha is wa(t) = 48 - (16/5)t
t/
The water in tank bravo is wb(t) = 48 + | (-(t/3) -1) dt.
...
14. ## Question: Billiard ball

by CWH68
2
Views
519

### In an inelastic collision, the total kinetic...

In an inelastic collision, the total kinetic energy after is less than the total kinetic energy before the collision. My bad. Hope this helps.
-CWH :-)
15. ## Question: Billiard ball

by CWH68
2
Views
519

### Hint: Use the law of conservation of momentum. ...

Hint: Use the law of conservation of momentum.

m1v*1 + m2v*2 before = m1v*1 + m2v*2 after.

Here, v* denotes the velocity vector, and v denotes the speed.

In an elastic collision, kinetic...
16. ## Question: Ph calculation

by CWH68
1
Views
363

### Hint: Adding any amount of a stronger...

Hint: Adding any amount of a stronger concentration of HCl will lower the pH.
17. ## Question: Question about eigenvalue problem

by CWH68
6
Views
1,270

### You must have a typographical error in the...

You must have a typographical error in the problem, because the boundary conditions that were given allow y(x)=x to be an eigenfunction corresponding to lambda = 0, and y(x) = sin (2Pi x) to be an...
18. ## Question: Question about eigenvalue problem

by CWH68
6
Views
1,270

### To show that the above boundary value problem is...

To show that the above boundary value problem is not a Sturm - Liouville problem, observe that the general solution to y'' + hy = 0 is:

y = A cos x sqrt(h) + B sin x sqrt(h). As y(0) = 0, ...
19. ## Question: Chemistry

by CWH68
1
Views
633

### 1.75 g Zn x (1 mole Zn/65.38 g Zn) x (1 mole Zn/...

1.75 g Zn x (1 mole Zn/65.38 g Zn) x (1 mole Zn/ 1 mole ZnS) =

0.02677 moles ZnS will be produced, which is

0.02677 moles ZnS x (97.44 g ZnS/ 1 mole ZnS) =

2.608 g ZnS will be...
20. ## Question: Physics Question 1

by CWH68
4
Views
950

### True. The angle of the brush is not known. Call...

True. The angle of the brush is not known. Call it a. Then,

F = 12N / (cos a - 0.2 sin a) provided tan a < 5. Otherwise, he cannot push the brush up.

P. S. a is the angle of the brush...
21. ## Question: How to find the energy of a photon?

by CWH68
1
Views
872

### E = hv where h= Planck's constant = 6.626 x 10-²7...

E = hv where h= Planck's constant = 6.626 x 10-²7 erg sec, and v is the frequency.

So the energy is (6.626 * 10^-27 erg sec)(5 * 10^12 sec^-1) = 3.313*10^-14 erg.
22. ## Question: Physics Question 1

by CWH68
4
Views
950

### He pushes it up with a force of 12N, to cancel...

He pushes it up with a force of 12N, to cancel the force of gravity.
23. ## Question: Physics problem

by CWH68
3
Views
418

### Correction 1033.6 cm H2O. I hate typing on this...

Correction 1033.6 cm H2O. I hate typing on this phone!
-CWH :-)
24. ## Question: Physics problem

by CWH68
3
Views
418

### Correction 103.36 cm H2O.

Correction 103.36 cm H2O.
25. ## Question: Physics problem

by CWH68
3
Views
418

### The water column that will give the same pressure...

The water column that will give the same pressure would be:

76 cm Hg x 13.6 g/cc Hg / 1.0 g/cc H2O = 1035.2 cm H2O.

by CWH68