## Why might the objective to maximize profits be difficult to use at the plant level? What advantages, or disadvantages, are there to using “minimize unit cost” instead?

production
Factory Physics by Hopp and Spearman 3rd edition
Problems: Chapter 6 – Study Question 5, 9; Problems – 2
Chapter 7 – 4, 6, 8 – intuitive building exercise

Chapter 6-Study Question
5) Give as new example of a tautology.
9) Why might the objective to maximize profits be difficult to use at the plant level?
Problem (2)
A manufacturers of vacuum cleaners produces three models of canister-style vacuum cleaners—the X-100, X-200, and X-300—-on a production line with three stations —motor assembly, final assembly and test. The line is highly automated and is run by three operators, one for each station. Data on production times, material cost ,sales price, and bounds on demands are giving in the following tables: Product material cost Price Minimun Demand Maximium Demand – ( $/Unit) ($/unit) (units per mnth) (Unit per month)
X-100 80 350 750 1,500
X-200 150 500 0 500
X-300 160 620 0 300
SECOND TABLE
Product Motor Assembly Final Assembly Test – (minimum per unit) (minimum per unit) (minimum per unit)
X-100 8 9 12
X-200 14 12 7
X-300 20 16 14
Labour cost $20 per hour (including benefits),and overhead for the line is$460,000 per month.The current production plan calls for production of X-100, X-200, and X-300 to be 625,500, and 300 units per month, respectively. What is the monthly profit that results from the current production plan (i.e., sales revenue minus labor cost minus material cost minus overhead)?
Estimate the profit per unit of each model, using direct labor hours to allocate the overhead cost per month. Which product appears most profitable? Is the current production plan consistent with these estimates? If not, propose an alternative production plan and compute its monthly profit.
Chapter7, Problems:;
4) A print shop runs a two-station building line, in which the first station punches hole in the pages and the second station installs the binders.On average, the punch machine can process 15,000 pages per hour, while the binders can process 10,000 pages per hour. The shop receives work that requires both punching and binding at a rate of 8,000 pages per hour. It also receives work requiring only punching at a rate of 5,000 pages per hour. Which station is the bottleneck of this line and why?
6) Repeat Problem 4 under the assumption that all jobs are processed at a station before moving ( as in the worst case).
8) Consider the following three-station production line with a single product that must visit stations 1, 2, and 3 in sequence:
* Station 1 has five identical machines with average processing time of 15 minutes per job. * Station 2 has 12 identical machines with average processing time of 30 minutes per job. * Station 3 has one machine with average processing time of 3 minutes per job.
a) What are the bottleneck rate rb*,the raw process time To* and the critical WIP wo*? b) Compute the average cycle time when the WIP level is set at 20 jobs, under the assumption of: i) The best case
ii) The worst case
iii) The practical worst case
c) Suppose you desire the throughput of a line to be 90 percent of the bottleneck rate. Find the WIP level required to achieve this under the assumptions of:
i) The best case
ii) The worst case
iii) The practical worst case
d) If the cycle time at the critical WIP is 100 minutes, where does performances fall relatives to the cases? Is thered much room for improvement?

Chapter 7, Intuition -Building Exercise.
1) Simulate penney Fab Two by taking a piece of paperand drawing a schematic of the line (see figure 7.21). Draw the squares large enough to contain a penny. To the right of each squre, write the time of the completion of the job occupying that square (as the stimulation progresses, you will cross out the old time and replace it with the next time). The stimulation progresses by setting the current ” stimulated time to be the earliest completion time and moving the pennies accordingly.
Run your simulation for several simulated hours with seven pennies. Note how the second station sometimes starves.
b) Run your simulation for several simulated hours with eight pennies. Observe that station 2 never starves and there is never any queueing once the initial transient queue is dissipated in front of the first station.
penny Fab two with w=9, 22hours into the simulation .
c) Run your simulation for several simulated hours with nine pennies (figure 7.21 illustrates this scenario after 22 simulated hours). Note that after the initial transient , there is always a queue in front of the station.
2) Simulate Penny Fab Two for 25 hours starting with an empty line and eight pennies in front. Record the cycle time for each penny that finishes during this time (i.e., record its start time and finish time and compute cycle time as the difference).
a) What is the average cycle time CT?
b) How many jobs finish during the 25 hours?
c) What is the average throughput TH over 25 hours? Does average WIP equal CT times TH ? Why or why not? ( Hint: Did Little’s law hold for the first 2 hours of our simulation of penny Fab One?) What does it tell you about the use of Little’s law over short time interval?

## Listen to the podcast on Asteroid Deflection. A positive use for nuclear weapons is demonstrated. In fact, this idea was the basis of two movies in recent years. (Asteroid, 1997 and Deep Impact, 1998) Does this change your position in any way on the development of nuclear armament?

His is for my science course. I am to write a one page summary including answering the questions asked in the next paragraph, with a minimum of 3 references.

Listen to the podcast on Asteroid Deflection. A positive use for nuclear weapons is demonstrated. In fact, this idea was the basis of two movies in recent years. (Asteroid, 1997 and Deep Impact, 1998) Does this change your position in any way on the development of nuclear armament? How could the need for this technology for non-military use be prevented from use in military/terrorism actions? Who would decide? Or is this too big of a risk? Be sure to cite 3 references to support your position.

The direct link provides a transcript of the following podcasts.

Detecting Plastics Direct link to website

## Do all the planets orbit the Sun in the same direction? If so, is it counter clockwise (CCW) or clockwise (CW)? If not, list which planets orbit in different directions and indicate the direction.

Do all the planets orbit the Sun in the same direction? If so, is it counter clockwise (CCW) or clockwise (CW)? If not, list which planets orbit in different directions and indicate the direction.

## Mop and Broom Manufacturing estimates that it takes 4½ hours for each broom to be produced, from raw materials to final product. An evaluation of the process reveals that the amount of time spent working on the product is 3 hours.

Mop and Broom Manufacturing estimates that it takes 4½ hours for each broom to be produced, from raw materials to final product. An evaluation of the process reveals that the amount of time spent working on the product is 3 hours. Determine process velocity.

## The length of an infrared light wave is approximately 0.0000037 m. Write this number in scien¬tific notation.

The length of an infrared light wave is approximately 0.0000037 m. Write this number in scien¬tific notation.

## THe rings of saturn alternately appear very distinct and then almost disappear when viewed from the earth over a period of a few years.

THe rings of saturn alternately appear very distinct and then almost disappear when viewed from the earth over a period of a few years because the

A)Earth is very much closerto saturn at opposition than at conjuction, s the rings are more easily seen at this time.
B) Solar wind occasionally blows away the ring particles when the sun is particularly active

C)Ice crystals from which they are made melt of refreeze as the planet approaches andrecedes from the sun.
D) Plane of the rings is tilted with respect to the ecliptic plane and thus appears edge on at times

## What other sources of energy could be developed to solve the energy crisis?

What other sources of energy could be developed to solve the energy crisis?

## What is power and what are some of its sources?

What is power and what are some of its sources?

## The Zeeman effect describes the change in waveength of emitted light caused by

The Zeeman effect describes the change in waveength of emitted light caused by

A) The light passing through a tansparent medium
B) Magnetic fields acting on the radiating atoms.
C) The atoms being in an extremly intense gravitational field
D) relative motion of th esorce and observ

## By how much does the mass of the sun decrease each second because of the energy radited from it (its lumosity)?

By how much does the mass of the sun decrease each second because of the energy radited from it (its lumosity)?
A) 6.0 x 10 to the 11 Kg
B) 2.0 x 10 to the 7th Kg
C) 3.9 x 10 to the 26 kg
D) 4.3 x 10 to the 9 Kg

## Over the period of a complete year, an at the south Pole Would be able to see what fraction of the overall sky? A50 percent B100percent Csomewhat less then 5o percent D a variable amount, depending on the F428 longitude H425

Over the period of a complete year, an at the south Pole Would be able to see what fraction of the overall sky?

A50 percent
B100percent
Csomewhat less then 5o percent
D a variable amount, depending on the F428 longitude H425

## How often does the moon rotate to keep one face pointed toward the earth at all times? A once per year B once per month C not at all D once per day

How often does the moon rotate to keep one face pointed toward the earth at all times?
A once per year
B once per month
C not at all
D once per day

## Describe howsilicon-based semiconductors revolutionized computing

Describe howsilicon-based semiconductors revolutionized computing

## Steam leaves a boiler at 600 deg F and a pressure of 150 psia. Find the following properties for this steam Internal energy, u, btu/lbm Specific volume,v, cubic feet/lbm Enthalpy, h, btu/lbm Entropy, s, btu/lbmR

Steam leaves a boiler at 600 deg F and a pressure of 150 psia.
Find the following properties for this steam
Internal energy, u, btu/lbm
Specific volume,v, cubic feet/lbm
Enthalpy, h, btu/lbm
Entropy, s, btu/lbmR

## An intrinsic semiconductor (Si) is doped with a p-type impurity. The minority carrier population in that material at room temperature is measured to be 11250 per cm^3.

An intrinsic semiconductor (Si) is doped with a p-type impurity. The minority carrier population in that material at room temperature is measured to be 11250
per cm^3. Given that, at room temperature, the hole mobility in Si as 350 cm^2/Vsec and ni
= pi = 1.5 × 10^10 per cm^3, determine the electrical resistivity of the doped semiconductor
(at room temperature).

## Show that the resistivity of intrinsic Ge at 300degreeK 15 45 ohm-cm. If donor impurity is added to an extent of 1 atom per 10^8 Ge atoms, prove that the resistivity of the Ge sample drops to 3.7 ohm-cm (at 300degreeK). Assume μn = 3800 cm^2/Vsec; μp = 1800 cm^2/Vsec; ni = 2.5 × 10^13 electrons per cm^3; and, number of Ge atoms per cm^3 = 4.41 × 10^22.

Show that the resistivity of intrinsic Ge at 300degreeK 15 45 ohm-cm. If donor impurity is added to an extent of 1 atom per 10^8 Ge atoms, prove that the resistivity of the
Ge sample drops to 3.7 ohm-cm (at 300degreeK). Assume μn = 3800 cm^2/Vsec; μp = 1800 cm^2/Vsec; ni = 2.5 × 10^13 electrons per cm^3; and, number of Ge atoms per cm^3 = 4.41 × 10^22.

## What is the importance of magnetic reversals to the theory of Plate Tectonics?

1. (Points: 1)
What is the importance of magnetic reversals to the theory of Plate Tectonics?

a. It causes earthquakes

b. It causes volcanic eruptions

c. It provides evidence for seafloor spreading

d. It explains times of rapid change on the Earth’s surface

2. (Points: 1)
The Himalayas are associated with which of the following plate boundaries?

a. Divergent

b. Transform Fault

c. Ocean-continental convergence

d. Continent-continent convergence

3. (Points: 1)
East Africa Rift Valley is an example of

a. divergent plate boundary

b. passive continental margin

c. convergent plate boundary

d. transform fault plate boundary

## The position of an element in the periodic table is directly related to the

The position of an element in the periodic table is directly related to the
A mass of the nucleus of the atom
B number of protons in the atomic nucleus and hence to its positive charge
C Total number of protons and neutrons in the atomic nucleus
D number of electrons in the atomic nucleus and hence to its negitive charge

## A stone is thrown upward from the edge of a cliff, reaches its maximum height, and then falls down into the valley below. A motion diagram for this situation is given , beginning the instant the stone leaves the thrower’s hand.

A stone is thrown upward from the edge of a cliff, reaches its maximum height, and then falls down into the valley below. A motion diagram for this situation is given , beginning the instant the stone leaves the thrower’s hand. Construct the corresponding motion graphs taking the acceleration due to gravity as exactly 10 \rm m/s^2 . Ignore air resistance. In all three motion graphs, the unit of time is in seconds and the unit of displacement is in meters. In plotting the points, round-off the coordinate values to the nearest integer. Construct a graph corresponding to the stone’s vertical displacement, y(t).
Construct a graph corresponding to the stone’s vertical velocity, v_y(t).
Construct a graph corresponding to the stone’s vertical acceleration, a_y(t).

## Physiological observation devices _____.

Physiological observation devices _____.
a. electronically monitor product inventory
b. tabulate sales and revenue
c. describe interactions between people
d. evaluate customer satisfaction
e. monitor respondents’ patterns of information processing

## A 1.04 kg mass is attached to a spring of force constant 10.9 N/cm and placed on a frictionless surface. By how much will the spring stretch if the mass moves along a circular path of radius 0.495 m at a rate of 1.90 revolutions per second?

A 1.04 kg mass is attached to a spring of force constant 10.9 N/cm and placed on a frictionless surface. By how much will the spring stretch if the mass moves along a circular path of radius 0.495 m at a rate of 1.90 revolutions per second?

## What force must be applied to push a carton weighing 240 N up a 19° incline, if the coefficient of kinetic friction is 0.41? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)

What force must be applied to push a carton weighing 240 N up a 19° incline, if the coefficient of kinetic friction is 0.41? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)

## What other sources of energy could be developed to solve the energy crisis.

What other sources of energy could be developed to solve the energy crisis.

## When conducting an energy audit before sizing a renewable energy system, why should efficiency measures be considered before investment in energy generation?”

When conducting an energy audit before sizing a renewable energy system, why should efficiency measures be considered before investment in energy generation?”

## If you stand on a spring scale, showing weight, in your bathroom at home and it reads 588 N, it means that your mass is 60 kg.

If you stand on a spring scale, showing weight, in your bathroom at home and it
reads 588 N, it means that your mass is 60 kg. If instead you stand on the scale in an
elevator, how many Newton’s would it read:
d. While the elevator is decelerating at 2 m/s2 downward

## If you stand on a spring scale, showing weight, in your bathroom at home and it reads 588 N, it means that your mass is 60 kg.

If you stand on a spring scale, showing weight, in your bathroom at home and it
reads 588 N, it means that your mass is 60 kg. If instead you stand on the scale in an
elevator, how many Newton’s would it read:
c. While the elevator is accelerating at 2 m/s2 downward

## If you stand on a spring scale, showing weight, in your bathroom at home and it reads 588 N, it means that your mass is 60 kg. If instead you stand on the scale in an elevator, how many Newton’s would it read: b. While the elevator is decelerating at 2 m/s2 upward

If you stand on a spring scale, showing weight, in your bathroom at home and it
reads 588 N, it means that your mass is 60 kg. If instead you stand on the scale in an
elevator, how many Newton’s would it read:
b. While the elevator is decelerating at 2 m/s2 upward

## Most cars have a speedometer, Odometer, and a clock . A) describe how you could use these devices to determine the instantaneous speed of the car B) describe how you could use these devices to determine the average speed of the car

Most cars have a speedometer, Odometer, and a clock .

A) describe how you could use these devices to determine the instantaneous speed of the car

B) describe how you could use these devices to determine the average speed of the car