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sherry castillo

sherry c.

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What is the ratio of [TRIS]/[TRIS-H+] in a TRIS buffer (pKa = 8.30) at pH 8.90? [TRIS]/[TRIS-H+] =

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Problem 3. While 52-card decks are most common in the United States today, other decks are used elsewhere in the world or in history. For the purposes of this question, assume you are playing with a 32-card Piquet pack, with cards numbered 7, 8, 9, 10, J, Q, K, and A in each of four different suits (trèfles, carreaux, cœurs, and piques). Calculate the probability of each of the following hands, assuming that you draw five cards from a well-shuffled deck. (a) What is the probability of a royal flush (10, J, Q, K, and A all from the same suit)? (b) What is the probability of a flush (all five cards are of the same suit)? (c) What is the probability of a \"full house\" (three cards of one number, and two cards of another)?

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Risk transitions is a population's health status shift that usually occurs with socioeconomic development. O True O False

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0.06 moles of a monatomic gas undergoes the cycle A→B→C→A as shown on the P- V diagram below. Pressure (x10 N/m²) 3.5 A 600 K 3.0 2.5 2.0 1.5 1.0- C B 200 K 400 K 0.5- 0.0 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 Volume (x10³ m³) B In the transition AB the gas expands adiabatically and the temperature drops from 600K to 400K. What is AU for this transition? What is the work done on the gas? (This is the answer to (a) in the table below) During the transition BC, the volume decreases from 2x10-3 m³ to 1x10-3 m³ at constant atmospheric pressure (isobaric). What is the work done on the gas? (This is the answer to (c) in the table below)

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6 cm +1 ?C A. 4 cm 6 cm * -1 µC 3 cm B (a) Calculate the magnitude of the electric field at A.

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Question 2: Find the reactions on the bent rod which is supported by a smooth surface at B and by a collar at A, which is fixed to the rod and is free to slide over the fixed inclined rod. 100 lb 3 ft 3 ft 200 lb \cdot ft A 3 54 Figure 2: Bent rod 2 ft 13 B 5 12

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This transformation can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) in the correct order, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer. A B C D E Br$_2$, hv 1) \(\stackrel{O}{\triangle}\); 2) H$_3$O$^+$ 1) \(\stackrel{O}{\triangle}\); 2) Mg, diethyl ether H$_2$, Lindlar's cat. H$_3$O$^+$ F 1) MeMgBr; 2) H$_3$O$^+$ G Na, NH$_3$ (l) H MCPBA (RCO$_3$H) 1 1) EtMgBr; 2) H$_3$O$^+$ J HBr (xs), heat K L M N O dilute H$_2$SO$_4$ DMP or PCC SOCl$_2$, pyridine EtBr 1) BH$_3$-THF; 2) H$_2$O$_2$, NaOH

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Problem 4. Let X be an ambient set, and fix a subset $S \subseteq X$. (i) Consider the map $f: \mathcal{P}(X) \to \mathcal{P}(X)$ given by $f(A) = A \cap S$. Show that $f \circ f = f$. Determine the range of $f$. (ii) Consider the map $g: \mathcal{P}(X) \to \mathcal{P}(X)$ given by $g(A) = A \Delta S$. Show that $g \circ g = id_{\mathcal{P}(X)}$. Determine the range of $g$.

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15) A children's fair ride consists of a spring with a spring constant of 560 N/m that is compressed 1.28 m. The spring then launches a 320 kg cart along a horizontal frictionless track that then dips down a 7 m drop and then up another hill. K=560N/m X=1.28m m=320Kg h=7m ww 150 ko 5m a) How much total energy does the cart contain when it is attached to the compressed spring? PE+KE+PE_S = PE+KE+PE_S, PE = KE mgh = \frac{1}{2}mv^2 (320kg)(9.8m/s^2)(7m) = \frac{1}{2}(320kg)v^2 68.6 = \frac{1}{2}v^2 68.6 V=\sqrt{\frac{68.6}{\frac{1}{2}}} = V = 11.71 m/s b) What is the speed of the cart immediately after the spring propels it forward? V=\sqrt{\frac{KE}{\frac{1}{2}(m)}} = V=\sqrt{\frac{21939.86}{\frac{1}{2}(320)}} = V = 11.71 m/s KE=\frac{1}{2}(320)(11.71)^2 KE= c) How much kinetic energy does the cart have at the bottom of the hill? d) How much potential energy does the cart have at the top of the second hill?

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Consider the following AC circuit V1 sine R1 C1 L1 Assume all values are effective values V1=102volts F=7Hertz R=69ohms C=0.0006F L1=2.8H Determine the voltage at the resistor R1 in volts

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