OC userin ChemistryΒ·30 Oct 201773. Ultraviolet radiation and radiation of shorter wavelengths can damage biological molecules because these kinds of radiation carry enough energy to break bonds within the molecules. A typical carbon-carbon bond requires 348 kJ/mol to break. What is the longest wavelength of radiation with enough ener gy to break carbon-carbon bonds?
OC userin ChemistryΒ·30 Oct 201756. The fluids within cells are buffered by H2PO4 and HPO42- a. Calculate the ratio of HPO42-to H2PO4 required to main- tain a pH of 7.1 within a cell. b. Could a buffer system employing H3PO4 as the weak acid and H2PO4 as the weak base be used as a buffer system within cells? Explain.
OC userin PhysicsΒ·30 Oct 201731.25 . A series ac circuit contains a 250-22 resistor, a 15-mH inductor, a 3.5-F capacitor, and an ac power source of voltage amplitude 45 V operating at an angular frequency of 360 rad/S. (a) What is the power factor of this circuit? (b) Find the average power delivered to the entire circuit. (c) What is the average power delivered to the resistor, to the capacitor, and to the inductor?
OC userin ChemistryΒ·29 Oct 201743. A laser pulse with wavelength 532 nm contains 3.85 m) of energy. How many photons are in the laser pulse?
OC userin PhysicsΒ·28 Oct 201725.45 A 25.0-2 bulb is connected across the terminals of a 12.0-V battery having 3.50 2 of internal resistance. What per- centage of the power of the battery is dissipated across the internal resistance and hence is not available to the bulb?
OC userin AccountingΒ·30 Oct 2017PROBLEM 7-19 Second Stage Allocations and Product Margins [LO7-4, L07-5] Pixel Studio, Inc., is a small company that creates computer-generated animations for films and television. Much of the company's work consists of short commercials for television, but the com- pany also does realistic computer animations for special effects in movies The young founders of the company have become increasingly concerned with the eco- nomics of the business particularly since many competitors have sprung up recently in the local area. To help understand the company's cost structure, an activity-based costing system has been designed. Three major activities are carried out in the company: animation concept, animation production, and contract administration. The animation concept activity is carried out at the contract proposal stage when the company bids on projects. This is an intensive activity that involves individuals from all parts of the company in creating story boards and prototype stills to be shown to the prospective client. Once a project is accepted by the client, the anima- tion goes into production and contract administration begins. Almost all of the work involved in animation production is done by the technical staff, whereas the administrative staff is largely responsible for contract administration. The activity cost pools and their activity measures are listed below: Activity Cost Pool Activity Measure Activity Rate Animation concept ............. Animation production Contract administration .......... Number of proposals Minutes of completed animation Number of contracts $6,040 per proposal $7,725 per minute $6,800 per contract These activity rates include all of the company's costs, except for the costs of idle capacity and organization-sustaining costs. There are no direct labor or direct materials costs. Preliminary analysis using these activity rates has indicated that the local commercial seg- ment of the market may be unprofitable. This segment is highly competitive. Producers of local commercials may ask three or four companies like Pixel Studio to bid, which results in an unusu- ally low ratio of accepted contracts to bids. Furthermore, the animation sequences tend to be much shorter for local commercials than for other work. Since animation work is billed at fairly standard rates according to the running time of the completed animation, this means that the revenues from these short projects tend to be below average. Data concerning activity in the local commercial market appear below: Local Commercials Activity Measure Number of proposals .... Minutes of completed animation ... Number of contracts .. Doa The total sales from the 10 contracts for local commercials was $180,000. Required: 1. Determine the cost of serving the local commercial market. 2. Prepare a report showing the margin earned serving the local commercial market. (Remem- ber, this company has no direct materials or direct labor costs.) 3. What would you recommend to management concerning the local commercial market?
OC userin ChemistryΒ·29 Oct 20177. How and by whom was the electron discovered? What basic properties of the electron were reported with its discovery?
OC userin AccountingΒ·29 Oct 2017EXERCISE 15-12 Selected Financial Measures for Assessing Liquidity (L015-2] Norsk Optronics, ALS, of Bergen, Norway, had a current ratio of 2.5 on June 30 of the current year. On that date, the company's assets were: Cash ......... ..... Accounts receivable, net ........... Inventory .. Prepaid expenses..................... Plant and equipment, net .............. Total assets $ 90,000 260,000 490,000 10,000 800,000 $1,650,000 Required: 1. What was the company's working capital on June 302 2. What was the company's acid-test ratio on June 302 3. The company paid an account payable of $40,000 immediately after June 30. a. What effect did this transaction have on working capital? Show computations b. What effect did this transaction have on the current ratio? Show computations
OC userin ChemistryΒ·29 Oct 2017113. In this chapter we have seen a number of reactions in which a single reactant forms products. For example, consider the fol lowing first-order reaction: CH3NC(g) -CH,CN(g) However, we also learned that gas-phase reactions occur through collisions. a. One possible explanation for how this reaction occurs is that two molecules of CH3NC collide with each other and form two molecules of the product in a single elementary step. If that were the case, what reaction order would you expect? b. Another possibility is that the reaction occurs through more than one step. For example, a possible mechanism involves one step in which the two CH3NC molecules collide, result- ing in the "activation" of one of them. In a second step, the activated molecule goes on to form the product. Write down this mechanism and determine which step must be rate determining in order for the kinetics of the reaction to be first order. Show explicitly how the mechanism predicts first order kinetics.
OC userin AccountingΒ·27 Oct 2017PROBLEM 12-19 Dropping or Retaining a Segment [L012-2] Jackson County Senior Services is a nonprofit organization devoted to providing essential ser- vices to seniors who live in their own homes within the Jackson County area. Three services are provided for seniors-home nursing, Meals On Wheels, and housekeeping. Data on revenue and expenses for the past year follow: Home Nursing Meals On Wheels House- keeping Total $900,000 490,000 410,000 $260,000 120.000 140,000 $400,000 210,000 190,000 $240,000 160,000 80,000 Revenues ..... Variable expenses ............ Contribution margin ..... Fixed expenses: Depreciation ..... Liability insurance....... .. Program administrators' salaries ... General administrative overhead" ...... Total fixed expenses ........ ...... Net operating income (loss) ............. "Allocated on the basis of program revenues. 68,000 42,000 115,000 180.000 8,000 20,000 40.000 52.000 40,000 7,000 38,000 80,000 165,000 $ 25,000 20.000 15,000 37,000 48,000 120,000 $140,000 405,000 $ 5,000 120,000 $ 20,000 The head administrator of Jackson County Senior Services, Judith Miyama, is concerned about the organization's finances and considers the net operating income of $5,000 last year to be razor-thin. (Last year's results were very similar to the results for previous years and are represen- tative of what would be expected in the future.) She feels that the organization should be building its financial reserves at a more rapid rate in order to prepare for the next inevitable recession. After seeing the above report, Ms. Miyama asked for more information about the financial advisability of perhaps discontinuing the housekeeping program. The depreciation in housekeeping is for a small van that is used to carry the housekeepers and their equipment from job to job. If the program were discontinued, the van would be donated to a charitable organization. None of the general administrative overhead would be avoided if the housekeeping program were dropped, but the liability insurance and the salary of the program administrator would be avoided. Required: 1. Should the Housekeeping program be discontinued? Explain. Show computations to support your answer. 2. Recast the above data in a format that would be more useful to management in assessing the long-run financial viability of the various services.
OC userin PhysicsΒ·27 Oct 201770. Calculate the equilibrium constant for the reaction between Fe2+(aq) and Zn(s) (at 25 Β°C).
OC userin ChemistryΒ·26 Oct 201781. A concentration cell consists of two Sn/Sn2+ half-cells. The cell has a potential of 0.10 V at 25Β°C. What is the ratio of the Sn2+ concentrations in the two half-cells?
OC userin ChemistryΒ·28 Oct 2017107. Carbon-12 contains six protons and six neutrons. The radius of the nucleus is approximately 2.7 fm (femtometers) and the ra- dius of the atom is approximately 70 pm (picometers). Calcu. late the volume of the nucleus and the volume of the atom. What percentage of the carbon atom's volume is occupied by the nucleus? (Assume two significant figures.)
OC userin PhysicsΒ·26 Oct 201796. The ratio of sulfur to oxygen by mass in SO2 is 1.0:1.0. a. Find the ratio of sulfur to oxygen by mass in SO3. b. Find the ratio of sulfur to oxygen by mass in S.O.