Questions asked
3. Name one country (other than Portugal, France, or Iceland) that has made renewable energy a substantial (over 50 %) part of their electricity-generation portfolio. What types of renewable energy do they utilize, and how much of each (in %)? Cite your source.
7. Which of the following best describes the difference in the way B cells and cytotoxic T cells respond to invaders? A) B cells confer active immunity; cytotoxic T cells confer passive immunity. B) B cells kill viruses directly; cytotoxic T cells kill virus-infected cells. C) B cells secrete antibodies against a virus; cytotoxic T cells kill virus-infected cells. D) B cells accomplish cell-mediated immunity; cytotoxic T cells accomplish humoral immunity. E) B cells respond the first time the invader is present; cytotoxic T cells respond subsequent times.
A discus thrower starts from rest and begins to rotate with a constant angular acceleration of 2.9 rad/s2 . How many revolutions does it take for the discus thrower's angular speed to reach 6.2 rad/s ? How much time does this take?
Which of the following are qualitatively identical: ? You at age 3 and you today. ? A block of ice and the puddle of water that results after it melts ? An acorn and an oak tree ? A caterpillar and a butterfly ? None of the above
2. [4.16/12.5 Points] DETAILS MY NOTES WANEFMAC6 P.3.007. Find the expected value $E(X)$, the variance $Var(X)$ and the standard deviation $\sigma(X)$ for the density function. (Round your answers to four decimal places.) f(x) = e$^x$ on $[0, \ln 2]$ $E(X) = 0.3863$ $Var(X) = 0.6137$ $\sigma(X) = 0.7836$ Submit Answer
While ethanol ($CH_2CH_2OH$) is produced naturally by fermentation, e.g. in beer- and wine-making, industrially it is synthesized by reacting ethylene ($CH_2CH_2$) with water vapor at elevated temperatures. A chemical engineer studying this reaction fills a 200. mL flask with 2.3 atm of ethylene gas and 0.72 atm of water vapor. When the mixture has come to equilibrium she determines that it contains 1.94 atm of ethylene gas and 0.36 atm of water vapor. The engineer then adds another 0.58 atm of ethylene, and allows the mixture to come to equilibrium again. Calculate the pressure of ethanol after equilibrium is reached the second time. Round your answer to 2 significant digits.
Given that $X_i \stackrel{iid}{\sim} N(\mu = 25, \sigma^2 = 9)$ for $i = 1, 2, 3, ..., 72$, what is the value of standard deviation of $Q = \sum_{i=1}^{72} \left(\frac{X_i - 25}{3}\right)^2$ ? Give your answer as an integer.
QUESTION 2 [25 points] A beam on simple supports shown in Figure Q2 is subjected to a variable distributed load of intensity $q_0$, where $q_0$ is the maximum intensity of the load. 1.1. Derive the equation of the slope and deflection of the curve [17] 2.1. Determine the deflection and slope at $x = L/2$ [08] $q_0$ $\frac{L}{3}$ $\frac{2L}{3}$ Figure Q1: Simply supported beam.
QUESTION 3 (3 marks): Design and draw a DC power supply that provides a nominal DC voltage of 5V and is able to supply a load current Iload as large as 25mA; that is, Rload can be as low as 200Ω. The power supply is fed from a 120V (rms) 60Hz AC line. Assume the availability of a 5.1V zener diode having r = 10Ω at I = 20mA (and use Vzo = 4.9V), and that the required minimum current through the zener diode is Izmin = 5mA.
Question 6 Which of the following would not be classified as fiscal policy An increase in public good funding An increase in government spending Releasing more money to banks A decrease in transfer payment A decrease in taxes rates 1 pts
