Numerade

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Find the centroid $(\bar{x}, \bar{y})$ of the triangle with vertices at $(0, 0)$, $(9, 0)$, and $(0, 4)$. $\bar{x}=$ $\bar{y}=$

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You teach a section of undergraduate statistics for economists with 100 students. You give the students an assignment: They are to find a creative variable (for example snowfall in Wisconsin), calculate the correlation of their selected variable with stock price returns, and test the hypothesis that the correlation is zero. Assuming that each of the 100 students selects a variable which is truly unrelated to stock price returns, how many of the 100 students do you expect to obtain a p-value which is significant at the 5% level? Consequently, how should we interpret their results?

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Diff: 2 Page Ref: Sec. 26.7 21) What happens to the kinetic energy of a speedy proton when its relativistic mass doubles? A) It doubles. B) It more than doubles. C) It less than doubles. D) It must increase, but it is impossible to say by how much. $2m = m_0 \rightarrow m = \frac{1}{2}m_0$ $\frac{m_0}{2} = \frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}}$ Answer: B Diff: 2 Page Ref: Sec. 26.9

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Consider two electrons (spin 1/2 particles) whose spins are described by the Pauli matrices. Calculate the expectation value of the operator Siz defined by S12=3Ïƒ1-2Ïƒ2-Ïƒ3 in the triplet states |S,m>.

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Find the load-to-source voltage gain $V_o/V_s$ of the amplifier circuit.

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Problem B: Equations for the speed of sound The adiabatic speed of sound is defined as $v^2 = \left(\frac{\partial P}{\partial \rho}\right)_s$. First prove that: $\left(\frac{\partial P}{\partial \rho}\right)_s = \gamma \left(\frac{\partial P}{\partial \rho}\right)_T$, where $\gamma = \frac{C_P}{C_V}$ Using the formula you have just derived above calculate the adiabatic speed of sound in the air at ambient temperature (25 °C) assuming that the air behaves as an ideal gas. Compare your result with values published in the open literature.

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Builtrite is selling a machine for $20,000 that was purchased two years ago. The machine was purchased for $50,000 and it is being depreciated over its five year life eventually down to zero. What is the current terminal cash flow for this machine if Builtrite is in a 34% marginal tax bracket? ? $23,400 ? $20,000 ? $16,600 ? $13,400

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Given a reversible, first order reaction, with the following thermodynamic properties: dG = -13.5 kJ/mol, dH = -45 kJ/mol The following experimental data was measure: Temperature (oC) Time (minutes) Conversion 60 5 0.5 35 16 0.9 At what temperature (or range) should you operate to achieve an equilibrium conversion of at least 90%.

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PLEASE ANSWER IN DETAIL In the case of limited source diffusion, the surface concentration of Boron is found to be 1.1x1020cm-3and the junction depth is found to be 2.77mm after a 5-hour diffusion at 1100oC. Find the background doping of the wafer.

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An ABS systems that use a conventional master cylinder and vacuum booster for power assist, what type of accumulator is used as a temporary storage reservoir for brake fluid?

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tammy a.