Questions
Common terns hover in a stationary position over the ocean watching for a tasty fish. When...

Common terns hover in a stationary position over the ocean watching for a tasty fish. When they see one, they immediately stop their wings and simply free-fall into the ocean to catch the fish. Calculate how long a fish near the surface has to move away after the instant a tern sees it from a height of 3 m above the surface. Repeat Problem above, but now include air resistance. Assume a ball of 3 cm radius with an average density of 4400 kg/m 3 , a density of air of 1.3 kg/m 3 , and a value of C = 1.

In: Physics

Keynes wrote in The General Theory: “If we speak frankly, we have to admit that our...

Keynes wrote in The General Theory: “If we speak frankly, we have to admit that our basis of knowledge for estimating the yield ten years hence of a railway, a copper mine, a textile factory … amounts to little and sometimes to nothing”

Keynes was not talking about periods of turmoil and crisis when it might be expected that accurate information would be hard to come by; in his view, a state of “near ignorance” was the normal state of affairs.

Discuss Keynes’ concept of “uncertain” knowledge and what it may imply for our ability to measure risk and to invest, both in financial assets as well as in “real” businesses.

In: Economics

At the beach, some waves with wavelength of 100 m propagate towards the shore at a...

At the beach, some waves with wavelength of 100 m propagate towards the shore at a speed of 12.5 m/s. (c) Does the engine sound higher- or lower-pitched to someone standing on the shore, compared with the experience of people on the boat?

(a) Calculate the frequency that boat anchored near shore bobs up and down as the waves roll in.

(b) At what frequency the boat would bob up and down with if it were headed away from the shore at a speed of 4.8 m/s?

(c) At what frequency the boat would bob up and down with if it were headed toward the shore at a speed of 4.8 m/s?

In: Physics

1)The histone proteins of nucelosomes are often abnormally modified in cancer cells, leading to _____. a....

1)The histone proteins of nucelosomes are often abnormally modified in cancer cells, leading to _____. a. an alteration in chromatin structure b. an alteration in levels of transcription c. double-stranded breaks in DNA d. All of the above e. Both a and b

2)

A DNA strand contains the sequence TCGGATGCACCT. A mutation happened that results in the sequence TCCGGATGCACCT. What type of mutation does this change represent?

a point mutation

a missense mutation

frameshift mutation

a silent mutation

3)

Chromosomal rearrangements might position a gene near heterochromatin. The gene's transcription

may be inverted.

may be amplified.

may cease.

will turn on.

In: Biology

Walker Pen Company Jane Dempsey, controller of the Walker Pen Company, was concerned about the recent...

Walker Pen Company
Jane Dempsey, controller of the Walker Pen Company, was concerned about the recent financial trends in operating results. Walker Pen had been the low-cost producer of traditional BLUE pens and BLACK pens. Profit margins were over 22% of sales.
Several years earlier Dennis Selmor, the sales manager, had seen opportunities to expand the business by extending the product line into new products that offered premium selling prices over traditional BLUE and BLACK pens. Five years earlier, RED pens had been introduced; they required the same basic production technology but could be sold at a 3% premium. And last year, PURPLE pens had been introduced because of the 8% premium in selling price they could command.
But Dempsey had just seen the financial results (see Exhibit 1) for the most recent fiscal year and was keenly disappointed.
The new RED and PURPLE pens do seem more profitable than our BLUE and BLACK pens, but overall profitability is down, and even the new products are not earning the margins we used to see from our traditional products. Perhaps this is the tougher global competition I have been reading about. At least the new line, particularly PURPLE pens, is showing much higher margins. Perhaps we should follow Dennis's advice and introduce even more specialty colored pens. Dennis claims that consumers are willing to pay higher prices for these specialty colors.
Jeffrey Donald, the manufacturing manager, was also reflecting on the changed environment at the Walker Pen Company:
Five years ago, life was a lot simpler. We produced just BLUE and BLACK pens in long production runs, and everything ran smoothly, without much intervention. Difficulties started when the RED pens were introduced and we had to make more changeovers. This required us to stop production, empty the vats, clean out all remnants of the previous color, and then start the production of the red ink. Making black ink was simple; we didn't even have to clean out the residual blue ink from the previous run if we just dumped in enough black ink to cover it up. But for the RED pens, even small traces of the blue or black ink created quality problems. And the ink for the new PURPLE pens also has demanding specifications, but not quite as demanding as for RED pens.
We seem to be spending a lot more time on purchasing and scheduling activities and just keeping track of where we stand on existing, backlogged, and future orders. The new computer system we got last year helped a lot to reduce the confusion. But I am concerned about rumors I keep hearing that even more new colors may be introduced in the near future. I don't think we have any more capability to handle additional confusion and complexity in our operations.
Exhibit 1
Traditional Income Statement
Blue Black Red Purple Total
Sales $88,408 $64,328 $15,930 $1,674 $170,340
Material costs 29,298 21,318 5,040 468 $56,124
Direct labor 12,028 8,752 2,106 211 $23,097
Overhead @ 270% 32,476 23,630 5,686 570 $62,362
Total operating income $14,606 $10,628 $3,098 $425 $28,757
Return on sales 17% 17% 19% 25% 17%
Operations
The Walker Pen Company produces pens in a single factory. The major task is preparing and mixing the ink for the different-colored pens. The ink is inserted into the pens in a semiautomated process. A final packing and shipping stage is performed manually.
Each product has a bill of materials that identifies the quantity and cost of direct materials required for the product. A routing sheet identifies the sequence of operations required for each operating step. This information is used to calculate the labor expenses for each of the four products. All of the plant's indirect expenses are aggregated at the plant level and allocated to products on the basis of their direct labor content. Currently, this overhead burden rate is 270% of direct labor cost. Most people in the plant recalled that not too many years ago the overhead rate was only 200%.
Activity-Based Costing
Jane Dempsey recently attended a seminar of her professional organization in which a professor had talked about a new concept, called activity-based costing (ABC). This concept seemed to address many of the problems she had been seeing at the Walker Pen Company. The speaker even used an example that seemed to capture Walker's situation exactly.
The professor argued that overhead should not be viewed as a cost or a burden to be allocated on top of direct labor. Rather, the organization should focus on activities performed by the indirect and support resource of the organization and try to link the cost of performing these activities directly to the products for which they were performed. Dempsey obtained several books and articles on the subject and soon tried to put into practice the message she had heard and read about.
Activity-Based Cost Analysis
Dempsey first identified six categories of support expenses that were currently being allocated to pen production:
Expense Category Expense
Indirect labor $20,626
Fringe benefits 17,489
Computer systems 10,193
Machinery 7,396
Maintenance 4,437
Energy 2,221
Total $62,362
She determined that the fringe benefits were 40% of labor expenses (both direct and indirect) and would thus represent just a percentage markup to be applied on top of direct and indirect labor charges.
Dempsey interviewed department heads in charge of indirect labor and found that three main activities accounted for their work. About 52% of indirect labor was involved in scheduling or handling production runs. This proportion included scheduling production orders; purchasing, preparing, and releasing materials for the production run; performing a first-item inspection every time the process was changed over, and some scrap loss at the beginning of each run until the process settled down. Another 40% of indirect labor was required just for the physical changeover from one color pen to another.
The time to change over to BLACK pens was relatively short (about 1.1 hour) since the previous color did not have to be completely eliminated from the machinery. Other colors required longer changeover times; RED pens required the most extensive changeover to meet the demanding quality specification for this color.
The remaining 8% of the time was spent maintaining records on the four products, including the bill of materials and routing information, monitoring and maintaining a minimum supply of raw materials and finished goods inventory for each product, improving the production processes, and performing engineering changes for the products. Dempsey also collected information on potential activity cost drivers for Walker's activities (see Exhibit 2) and the distribution of the cost drivers for each of the four products. Dempsey next turned her attention to the $10,193 of expenses to operate the company's computer system. She interviewed the managers of the Data Center and the Management Information System departments and found that most of the computer's time (and software expense) was used to schedule production runs in the factory and to order and pay for the materials required in each production run.
Because each production run was made for a particular customer, the computer time required to prepare shipping documents and to invoice and collect from a customer was also included in this activity. In total, about 79% of the computer resource was involved in the production run activity. Almost all of the remaining computer expense (21%) was used to keep records on the four products, including production process and associated engineering change notice information.
The remaining three categories of overhead expense (machine depreciation, machine maintenance, and the energy to operate the machines) were incurred to supply machine capacity to produce the pens. The machines had a practical capacity of 10,100 hours of productive time that could be supplied to pen production.
Dempsey believed that she now had the information she needed to estimate an activity-based cost model for the Walker Pen Company.
Exhibit 2
Direct Costs and Activity Cost Drivers
Blue Black Red Purple Total
Production sales volume
(no. of units) 51,400 37,400 9,000 900 98,700
Unit selling price $1.72 $1.72 $1.77 $1.86
Materials/unit cost $0.57 $0.57 $0.56 $0.52
Direct labor hr/unit 0.02 0.02 0.02 0.02 1,974
Machine hour/unit 0.11 0.09 0.11 0.10 10,100
No. of production runs 53 41 41 11 146
Setup time/run (hours) 4.60 1.10 6.40 3.80
Total setup time (hours) 244 45 262 42 593
Number of products 1 1 1 1 4
Required:
1. Design an Excel model to estimate the costs for the four pen products using an activity-based costing approach (provide a unit cost per pen color).
2. Prepare a revised income statement with profit margin calculations. The income statement should be modeled on Exhibit 1 and include cost by pen color and in total.
3. Write an Executive Memo to Jane Dempsey and Dennis Selmor explaining the managerial implications from the revised cost estimates.
4. Bonus Question: Why is it acceptable for the fringe benefits associated with direct to be in the overhead cost pool when using direct labor as the allocation base and it is not acceptable for the fringe benefits associated with direct labor to be in the overhead cost pool when using ABC?
Round total costs and driver amounts; use 2 decimal places for activity rates and unit costs. After allocating costs, your total overhead cost may have a rounding error of $6.
Hints:
1.) The cost of the blue pen using ABC is: $1.34 (rounded).
2.) The overhead cost pool for the ABC method totals $53,123.
3.) When switching from the plant wide allocation of overhead using direct labor as the allocation base to the ABC method, you must assign to direct labor the fringe benefits associated with direct labor and not maintain this portion of the fringe benefits in the overhead cost pool.
4.) Production is one of four activities used in the analysis.

In: Accounting

2. There may be only one or there may be more than one correct response to...

2. There may be only one or there may be more than one correct response to this question. You need only mark any one of the possible correct responses to be marked correct. A - Touch the top of the electroscope with your finger B - Remove your finger from the top of the electroscope C - Touch the top of the electroscope with a glass rod that was just previously rubbed by silk D - Touch the top of the electroscope with a rubber rod that was just previously rubbed with fur E - Remove the charged glass rod from the vicinity of the electroscope F - Remove the charged rubber rod from the vicinity of the electroscope G - Move the charged glass rod near the top of the electroscope H - Move the charged rubber rod near the top of the electroscope You are provided with an electroscope that may already have placed on it an unbalanced charge (that is the initial state of the electroscope might be overall positive, negative or neutral - you just don’t know!). You wish to make sure the electroscope has a negative charge. The steps you may take in doing this are provided above (A-H). Below is a set of steps done in a precise order that you can perform. Which of these sets of steps done in the order shown will result in the electroscope acquiring a negative charge through the process of conduction? There might be more than one correct set. A, H, B, F A, B, C, G A, D, F, B A, C, G, B A. B. D, F H, A, B, F G, A, B, E

In: Physics

Experiment 2: Static Materials In this experiment, you will investigate the phenomenon of static electricity of...

Experiment 2: Static Materials
In this experiment, you will investigate the phenomenon of static electricity of various materials.

Materials
Electrostatics Kit Materials
*Paper (Any Kind)
*Flat Work Surface     


  
Procedure
1.   Tear the paper into small pieces (approximately the size of a hole-punch) and scatter them in a small area on a table or flat surface.
2.   Choose one plastic strip (acetate [light blue and transparent], vinyl [no color and transparent], or polyethylene [white and translucent]) and one fabric (wool or cotton cloth) from the electrostatics kit.
3.   Quickly rub the fabric up and down the length of the plastic strip for approximately 20 seconds.
4.   Bring the plastic strip near the small, torn pieces of paper.
5.   Record observations about the amount picked up and behavior of the paper in Table 2.
6.   Repeat Steps 2 – 5 for five additional fabric and plastic combinations.


Table 2: Static Electricity Properties of Various Materials

Type of Plastic Type of Fabric Observations



  
    Post-Lab Questions

1.   What happens when you bring the charged plastic strip near the paper pieces? Why does this happen?

2.   Draw a free body diagram of the forces acting on the piece of paper.

3.   Why does the electric force easily overcome the force of gravity and lift the paper off the surface without even touching the paper?

4.   Which of the materials pick up positive charge and which pick up negative charge? How did you determine this?

In: Physics

5. Today Van de Graaff accelerators sometimes serve as “injectors” for other types of accelerators that...

5. Today Van de Graaff accelerators sometimes serve as “injectors” for other types of accelerators that then further increase the energy of the particles. Consider a Van de Graaff accelerator that is being used to accelerate protons. The high voltage terminal (metal sphere) of the Van de Graff is charged using a rubberized belt that is 30 cm wide and travels at a velocity of 20 m/s. Charge is sprayed onto the belt near the roller at the low voltage end and removed from the belt near the upper roller inside the high voltage terminal. The belt is given sufficient surface charge density at the lower roller to cause an electric field of 1.0 MV/m (i.e. approaching the breakdown field of air at atmospheric pressure which is ~ 3 MV/m) on each side of the belt. (a) What is the charging current delivered to the high voltage terminal in µA? Suppose we would like to accelerate the protons to an energy of 3 MeV. Take the radius of the spherical high voltage terminal to be the such that the electric field at the surface of the sphere just below the breakdown field of air (b) How long does it take to charge the high voltage terminal of the Van de Graaff from zero volts to 3 MV? The beam of 3 MeV protons is focused onto a lithium target. The beam is equivalent to a current of 5 µA. (c) At what rate do protons strike the target? (d) At what rate is energy (heat) produced in the target? (e) Would you consider the Van de Graaff a ‘source of emf ? Why or why not?

In: Physics

Select the experiments that use a randomized comparative design. Environmental scientists are concerned with the effects...

Select the experiments that use a randomized comparative design.

Environmental scientists are concerned with the effects of nitrogen on the drinking water supply. Hundreds of farmers have volunteered to participate in the study in exchange for free fertilizer. The scientists assign the low-nitrogen blend to 25 randomly chosen farms near rivers, creeks, and tributaries and assign the normal blend to 25 randomly chosen farms not near such bodies of water. The scientists then compare mean biomass production in grams per square meter during the growing season.

Participants in a study to determine the effects of a new cholesterol drug are divided into groups based on gender. All males receive the new drug, and all females receive a currently approved drug.

A gas company offers three plans to customers. The company randomly chooses 200 customers who have signed up for each of the three plans. It then compares their gas bills over six months to determine which plan saves customers the most money.

To test a new epidermal treatment on fish in polluted pond water, 60 fish with epidermal abrasions from the same pond are randomly placed into three groups. One group receives the new treatment, another group receives the existing treatment, and the third group receives no treatment.

Students have volunteered to participate in a study of the effects of caffeine on memory. A computer program assigns each student at random to drink either a caffeinated or a decaffeinated beverage. The students are then given a list of 20 different objects to study for one minute and asked to write down as many of the new objects as they can remember.

In: Statistics and Probability

1. Electric charge is A property of matter that is distinct from energy, momentum, mass, velocity,...

1. Electric charge is

A property of matter that is distinct from energy, momentum, mass, velocity, and acceleration.
A property of matter that is determined by the energy of an object.
A property of matter that related directly to the momentum of an object.

2.

After rubbing a plastic ruler with a felt cloth, the ruler becomes negatively charged because:

The cloth destroyed positive charges in the ruler.
The kinetic energy lost to friction was converted into positive charges.
The negative charges were transferred from the cloth to the ruler.
The positive charges were transferred from the cloth to the ruler.

The potential energy lost to friction was converted into negative charges.

3. Electric charge is conserved, meaning _______.

a neutral object can never be separated into two charged objects.
the net amount of electric charge produced in any process is zero.

we must be careful not to waste charge.

4.  

Metals are typically ______________,
they allow charge to move freely.
Materials like wood, rubber, and plastic are _______________,
they do not allow charges to move freely.

conductors, insulators
insulators, conductors
conductors, semiconductors
semiconductors, conductors
semiconductors, insulators

5.

When a negatively-charged object is brought close to a neutral conductor, but does not touch it, what happens?

The free electrons in the conductor move closer to the negatively charged object, separating the charge in the conductor so it is more positive near the object.
The free electrons in the conductor move away from to the negatively charged object, separating the charge in the conductor so it is more positive near the object.
None of the above.

In: Physics