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Ecosystems - Definition - Recognize the abiotic and biotic components - Functional categories – relate these to trophic levels 1.Decomposer 2.Consumer 3.Primary producer

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In the South African National Guidelines on Nutrition for People living with HIV, AIDS, TB and other Chronic Debilitating Conditions in section 6 (p.25) it is stated that "during pregnancy and lactation there is an increased need of the following nutrients: calcium, iron, vitamin C and folic acid. Preference should be given to foods rich in these nutrients". A pregnant woman with HIV living in Soweto, Johannesburg, asks you why these nutrients are needed and which foods she can consume that are rich in these nutrients. Provide her with the role of each of these nutrients plus least three foods rich in each of these nutrients that she should include in her diet.

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During a rain storm, rain comes vertically down with a aped of -30.0 m/s and hits the roof of a Ford Fusion perpendicularly. The mass of raindrops per second which strikes the car roof is 0.0758 kg/s. Assuming that the raindrops come to a complete stop upon hitting the car, what is the average force exerted on the roof of the car by the rain? (a) What is the work done by the pulling force? (b) What is the work done by the kinetic frictional force?

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The human eye can detect as little as $2.35 \times 10^{-18}$ J of green light of wavelength 510 nm. Calculate the minimum number of photons that can be detected by the human eye.

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Two noncellular agents, smaller than viruses, are the infectious proteins called _________blank and the infectious RNA strands called _________blank. Multiple Choice viroids; phages prions; phages prions; viroids prions; capsomeres virions; prions

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5. Determine the rotation matrix for the following angle and direction: $\theta = 30^\circ$ clockwise $\begin{bmatrix} \frac{\sqrt{3}}{2} & -\frac{1}{2} \\ \frac{1}{2} & \frac{\sqrt{3}}{2} \end{bmatrix}$ $\begin{bmatrix} \frac{\sqrt{3}}{2} & -\frac{1}{2} \\ -\frac{1}{2} & -\frac{\sqrt{3}}{2} \end{bmatrix}$ $\begin{bmatrix} \frac{\sqrt{3}}{2} & \frac{1}{2} \\ \frac{1}{2} & \frac{\sqrt{3}}{2} \end{bmatrix}$ $\begin{bmatrix} \frac{\sqrt{3}}{2} & \frac{1}{2} \\ -\frac{1}{2} & \frac{\sqrt{3}}{2} \end{bmatrix}$

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Real GDP and Population over Time Tear 1 2 3 Real GDP (millions of dollars) $5,720 6,496 7,392 Population (thousands of people) 220 224 231 Real GDP per Capita (dollars) $26,000 29,000 32,000 Instructions: Round your answers to one decimal place. a. Using the information in the table, calculate the growth rates in real GDP, population, and the standard of living (real GDP per capita) between year 1 and year 2. Real GDP: Population: Standard of living: % % % b. Now, using the information in the table, calculate the growth rates in real GDP, population, and the standard of living between year 2 and year 3. Real GDP: % Population: % Standard of living: %

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\sigma_x = -3SR \text{ (MPa)} \newline \sigma_y = 3SR \text{ (MPa)} \newline \tau_{xy} = 2SR \text{ (MPa)} \newline \tau_{xy} = 3SR \text{ (MPa)} \newline \sigma_x = -3SR \text{ (MPa)}

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Q3. For a transformer coupled class A amplifier $R_L = 8.5 \Omega$, $V_{CC} = 32V$, $V_{Lpmax} = 12V$, and $\beta = 22$. Obtain the design parameters and furthermore design a voltage to current converting circuit for the input side so that $I_i = V_i/50$.

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We will study the one-speed diffusion model of a bare, homogeneous cylindrical reactor with material composition typical for PWR. We will use "homogenized" number densities corresponding to a PWR core operating at full power conditions and containing a concentration of 2210 ppm of natural boron dissolved in the water coolant for control purposes. The number densities and microscopic one-speed cross sections are given in the table. The cross sections are averaged over the neutron energy distribution in a typical PWR. Use this data to compute the critical core dimensions, assuming that the core is a cylinder. As in any design, not a single answer is possible. But you need to show that your dimensions give a critical configuration. Show all your steps, put words around your calculations, and make a conclusion. Material N(i/b-cm) 2.748 X 10^2 2.757 X 10^-2 3.694 X 10^-3 1.710 X 10^-3 1.909 X 10^-4 6.592 X 10^-3 0.000 1.001 X 10^-5 Oir(b) 0.650 0.260 0.787 0.554 1.62 1.06 1.21 oa(b) 0.294 1.78 X 10^-4 0.190 2.33 484.0 2.11 2.36 X 10^6 3.41 X 10^3 ai(b) 0 0 0 0 312.0 0.638 0 v H 0 Zr Fe 235U 238UJ 135 Xe 10B 0 0 0 0 2.43 2.84 0 0.877 0 0 Clues. Compute: 1. Diffusion coefficient (cm) 2. Infinite multiplication factor 3. Material buckling 4. Extrapolated distance

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antonio q.