Numerade

Questions asked

BEST MATCH

Two resistors, R_(1)=3.03\Omega and R_(2)=6.85\Omega , are connected in series to a battery with an EMF of 24.0 V and negligible internal resistance. Find the current I_(1) through R_(1) and the potential difference V_(2) across R_(2). I_(1)= A V_(2)= V

View Answer

BEST MATCH

Which is the stronger acud at 0.1M - one having a pKa of 5 of kne having a pKa if 3? How much stronger is the stronger acid relative to the weaker acid?

View Answer

BEST MATCH

5. The most common causes of xeroderma pigmentosum are mutations in the NER repair pathway. This results in an increased susceptibility to UV light-induced DNA damage and XP patients have a much higher risk of developing skin cancer. You're interested in studying XP and have developed cell lines from skin cancer patients that can be studied in tissue culture. You grew a normal wild-type cell line and each of your XP cell lines under both normal growth conditions and under a UV light treatment. You then provided each group of cells with radiolabeled nucleotides. After waiting a few hours, you measured the amount of radiolabeled DNA incorporated into the genomic DNA of each line. Your results are shown below. The units for amount of radioactivity is counts per minute (CPM). Cell Line CPM with no CPM in following mutagen (control UV treatment conditions) Wild-type 55,000 430,000 A 50,000 275,000 B 35,000 37,000 C 40,000 300,000 D 20,000 230,000 Which cell line(s) is/are most likely from XP patient(s)? Explain your answer.

View Answer

BEST MATCH

Let $f(x) = \begin{cases} x^2 - 4, & \text{for } x < 2\\ 7, & \text{for } x = 2 \\ 2x + 6, & \text{for } x > 2 \end{cases}. \text{ Then } \lim_{x \to 2^+} f(x) = $

View Answer

BEST MATCH

S1*. Find the real and imaginary parts of the input impedance as a function of \omega. (Remember there should be no \textquotedblleft j\textquotedblright in your answers.)

View Answer

BEST MATCH

For ordinary differential equation $x''(t) + 4x'(t) + 5x(t) = 0$ with initial conditions $x(0) = 3$ and $x'(0) = -5$, a) Use the four order Runge-Kutta method with step size $h = 0.1$ to solve the differential equation over the interval $[0, 5]$ in MATLAB. b) Compare the numerical solution with the true solution $x(t) = 3e^{-2t}cos(t) + e^{-2t}sin(t)$ in a MATLAB plot over the same interval. (Hint: define $y = x'$)

View Answer

BEST MATCH

#2. (20 p) Consider a rectangular body of silicon uniformly doped with acceptor atoms at concentration $N_A = 10^{17} cm^{-3}$. A $p$-$n$-junction is formed there by doping the right half side with donor atoms at $N_D = 2 \times 10^{18} cm^{-3}$. Draw the sketch of the structure and do the following: a) What is the concentration of dopants in the left half side of the structure and indicate it on the diagram. b) What is the concentration of dopants in the right half side of the structure and indicate it on the diagram. c) Determine which side will become $p$-type, and which $n$-type. d) Find the electron and hole concentration at the room temperature in the $p$-type region. e) Find the electron and hole concentration at the room temperature in the $n$-type region? f) Assuming the width of depletion region is 2$\mu m$, and the concentration changes linearly, find the direction and the value of the electron diffusion current and hole diffusion current across the $p$-$n$- junction if mobility of electrons and holes is 400 and 200 $cm^2/V\cdot s$ respectively.

View Answer

BEST MATCH

4? + Vx 10A ? 1? ia 4? 6? + 2ia 100V + Determine the value for using the following three methods: A. Nodal Analysis; B. Mesh Analysis; C. Thevenin's theorem by finding the Thevenin equivalent circuit seen by the resistor with the potential Vx across it.

View Answer

BEST MATCH

Problem 1. (a) (6pts.) Evaluate $\int_0^1 \int_{\sqrt{x}}^1 x e^{-y^2} dy dx$ by changing the order of integration. (b) (10pts.) Let $D$ be the region in the first quadrant bounded by the four curves $y = x$, $y = 2x$, $xy = 1$, and $xy = 2$. Evaluate $\iint_D y dA$ using the transformation $x = u/v$, $y = v$.

View Answer

BEST MATCH

In 2009, the inflation rate reached negative 0.4 percent while the unemployment rate hit 10 percent. If the target inflation rate was 2 percent and the full-employment rate of unemployment was 5 percent, what value does the Taylor Rule predict for the Fed's target interest rate back then? Would that rate have been possible given the zero lower bound problem? Negative 5.6 percent, not possible. Positive 6.4 percent, possible. Positive 0.4 percent, possible. Negative 4.6 percent; not possible.

View Answer

jonathan c.