# Kate

### Reversible well-insulated turbine process?

1 AnswerEngineering7 years ago### Instantaneous voltage in RLC circuit?

A 202Ω resistor, a 0.950H inductor, and a 6.00μF capacitor are connected in series across a voltage source that has voltage amplitude 32.0V and an angular frequency of 235rad/s .

What is v at t= 18.0ms ?

What is v_R at t= 18.0ms ?

What is v_L at t= 18.0ms ?

What is vC at t= 18.0ms ?

1 AnswerPhysics7 years ago### A closely wound rectangular coil of has dimensions of 28.0cm by 42.0cm . The plane of the coil is rotated?

A closely wound rectangular coil of 75.0 turns has dimensions of 28.0cm by 42.0cm . The plane of the coil is rotated from a position where it makes an angle of 40.0∘ with a magnetic field of 1.20T to a position perpendicular to the field. The rotation takes 0.110s . What is the average emf induced in the coil?

1 AnswerPhysics7 years ago### Determine where the following subsets are vector spaces or not?

Determine whether the following subsets of C^2 (R) are vector spaces or not (that is, whether they're subspaces of C^2(R) or not).

a) The set of functions, f, satisfying f(1) = f(2) - 1.

b) The set of functions, f, satisfying f(1) = f(2).

1 AnswerMathematics7 years ago### In the circuit, the 6 Ohm resistor is consuming energy at a rate...?

In the circuit, (http://i889.photobucket.com/albums/ac94/xk4t3xs0xw... the 6.0 Ω resistor is consuming energy at a rate of 24.0J/s when the current through it flows as shown.

PART A: Find the current through the ammeter A.

PART B: What are the polarity and emf of the battery E, assuming it has negligible internal resistance?

1 AnswerPhysics7 years ago### In the circuit, the 6 Ohm resistor is consuming energy at a rate...?

In the circuit, (http://tinypic.com/m/hu0k5k/2) the 6.0 Ω resistor is consuming energy at a rate of 24.0J/s when the current through it flows as shown.

PART A: Find the current through the ammeter A.

PART B: What are the polarity and emf of the battery E, assuming it has negligible internal resistance?

1 AnswerPhysics7 years ago### Probability - continuous uniform distribution?

The random variable X has uniform continuous distribution on the interval [0,10]. Find the distribution of Y = X^2 and P(Y>50).

1 AnswerMathematics8 years ago### An engineering statistics class has 40 students?

An engineering statistics class has 40 students and 60% are electrical engineering majors, 10% are industrial engineering majors, and 30% are mechanical engineering majors. A sample of 4 students is selected randomly, without replacement, for a project team. Let X and Y denote the number of industrial engineering and mechanical engineering majors, respectively. Determine the following:

a) fxy(x,y)

b) fx(x)

c) E(X)

d) fy|3 (y)

e) E(Y | X=3)

f) V(Y|X=3)

g) Are X and Y independent?

*I mainly just need help with part a because I don't know where to start, but I'm sure once I figure that out, I can figure out the rest. Thanks!

1 AnswerEngineering8 years ago### Is this a reasonable argument for the novel Fight Club?

"Just as alcohol is for an alcoholic, Tyler, the narrator's fabricated second personality, becomes an addiction for the narrator, pushing him further away from society until he finally hits the definitive bottom of attempting suicide in an effort to rid Tyler from his life."

My English professor is a tough grader in terms of what you're arguing. I've not done well because my argument followed too closely to the book, because it was too far-fetched apparently, & he's also made comments about arguments not being controversial enough, so I guess I'm just wondering if this argument fits these criteria.

1 AnswerBooks & Authors8 years ago### Titanium and silicon surfaces are irradiated with UV radiation with a wavelength of 249 nm.?

Titanium (phi = 6.94 x10^-19 J) and silicon (phi = 7.77 x 10^-19 J) are irradiated with UV radiation with a wavelength of 249 nm. What is the wavelength of the electrons emitted by the titanium surface?

1 AnswerChemistry8 years ago### Find the surface integral?

Find the surface integral ∫ ∫ f dS of the function f(x,y) = x^2 + y^2 over the sphere x^2 + y^2 + z^2 = 1.

1 AnswerMathematics8 years ago### gradient question for calculus 3?

Let R = x i + y j + z k and r = |R|. Find each of the following.

(a) ∇r

[options]

1. -R/r^3

2. R/r

3. R/r^2

4. r/R

5. 0

(b) ∇(1/r)

[options]

1. -R/r^3

2. R/r^2

3. R/r

4. r/R

5. 0

(c) ∇ln r

[options]

1. 0

2. R/r^3

3. R/r

4. R/r^2

5. r/R

thanks if you can help me with any of them!!

2 AnswersMathematics8 years ago### Use cylindrical or spherical coordinates, whichever seems more appropriate.?

Evaluate ∫∫∫ z dV which lies above the paraboloid z = x^2 + y^2 and below the plane z=6y. Use a computer algebra system to evaluate the integral.

I don't know how to use a computer algebra system to evaluate the integral. Can someone help me with that?

1 AnswerMathematics8 years ago### Find the moment of inertia about the z-axis of the solid cylinder?

Assume that the solid has constant density k.

Find the moment of inertia about the z-axis of the solid cylinder

x2 + y2 ≤ a2, 0 ≤ z ≤ h.

I_z=?

1 AnswerMathematics8 years ago### Find the triple integral?

Find the triple integral over the region of x^2 + y + z dV if the region R in space is bounded by the planes x=0, y=0, z=0, and x + y + z = 1

1 AnswerMathematics8 years ago### Integral help? Second integral of a double integral?

The double integral is -pi/2 to pi/2, 0 to 2 cos(theta) of rcos(theta) r dr dtheta, but I'm stuck on the integral of 8/3 integral from -pi/2 to pi/2 of cos^3(theta) dtheta. help please?

2 AnswersMathematics8 years ago### Double integral with polar coordinates?

integral from o to pi/2, integral from 1 to 2 of sqrt(4-r^2*cos^2(theta)-r^2*sin^2(theta))rdrdtheta

if you could please help me by showing steps, that would be great! thanks!

1 AnswerMathematics8 years ago### A 2.00 kg textbook rests on a frictionless, horizonal surface?

A 2.00 kg textbook rests on a frictionless, horizonal surface. A cord attached to the book passes over a pulley whose diameter is 0.150 m, to a hanging book with mass 3.00 kg. The system is released from rest, and the books are observed to move 1.20 m in 0.800 s.

a) What is the tension in each part of the cord?

b) What is the moment of inertia in the pulley about its rotation axis?

I know for the horizontal book, T=ma, and for the other book, W-T=ma. I also know the torque for the pulley is the moment of inertia * angular acceleration, but I can't figure out the tensions...help??

1 AnswerPhysics8 years ago### Given a point and a line, how do you find the time at which is occurs?

the line given is r(t)=ti + t^2j at the point (1,1,0). how do you find the time t?

I'm trying to find the curvature at the point, so when I take derivatives, the variable t is still in the equation.

1 AnswerMathematics8 years ago### Integral help? Needed to find the length of a curve?

the function is r(t)=(e^2t)cos(t)+(e^2t)sin(t)+e^2t evaluated from 0 to 10

the arc length would then be integral from 0 to 10 of sqrt((e^4t)cos^2(t)+(e^4t)sin^2(t)+e^4t)

What would be the integral of that?

1 AnswerHomework Help8 years ago