Supplies: aluminum foil, battery, tape
Safety warning. The foil will heat up and there will be very small sparks in this experiment. Keep it away from your face. Use a piece of cardboard under the experiment to keep from damaging surfaces.
Make the wires:
Cut two strips of aluminum foil about 15 cm long by 2 cm across. The dimensions do not matter greatly, it is all right to estimate.
Fold the two pieces in half and then in half again to make two long thin pieces of foil. Pull off a piece of tape a little bit shorter than the foil, and encase the foil in the tape. This will insulate your wire. Leave the ends exposed so you can make electrical contact at the ends. Do this to both pieces.
Gather any batteries you can find. You will need two 1.5 V batteries. Tape them together positive to negative so you will have an overall potential difference of 3 V. You can use more batteries for a more dramatic effect.
Should you connect the batteries in series or parallel to get the highest potential difference? Why?
Tape one of the aluminum foil wires to the positive end of the batteries and one to the negative end. Do not touch the wires together!!!!
Why should you not touch the wires together?
Now cut a small sliver of aluminum foil. Make it as thin as possible. Touch one wire to one end of the sliver and the other wire to the other end. You should see small sparks and the sliver should combust.
Theoretically how much current is going through the circuit when it is connected?
Why does the sliver combust?
Now cut a wider sliver. Connect it across the wires.
What happens when you connect the wider sliver? Why?
How does this relate to the fuses in your house or car?
If you were going to put a fuse in a circuit to protect a certain element, would you want the fuse in series or parallel to the element? Why?
In: Physics
Consider the experiments.
Experiment 1: A study is done to determine which of two fuel mixtures allows a rocket to travel farther over a period of time. Rocket A, which requires additional equipment to keep it stable, is used to test one fuel mixture, and rocket B is used to test the other. Both rockets are identical aside from their mass. The results indicate that rocket B traveled farther than rocket A over the same period of time.
Experiment 2: A double-blind experiment is performed to test whether a new drug is effective in lowering blood pressure. A random sample of subjects with high blood pressure is assigned to two groups. One group receives the new drug and the other group does not. Neither group is permitted to take any other medications during the experiment or to change their lifestyles in any way. The results of the experiment show that the drug is effective in lowering blood pressure.
Identify the experiment in which confounding occurs and the reason for its occurrence:
Neither experiment has a confounding variable.
Experiment 2 has a confounding variable related to the subjects used. Choosing a sample of subjects with high blood pressure instead of individuals with different blood pressure levels may confuse the results.
Experiment 2 has a confounding variable related to the type of experiment. A double-blind experiment may increase the risk of the placebo effect and possibly skew the results.
Experiment 1 has a confounding variable related to the fuel mixtures. Varying the fuel mixture could skew the results of the study and should be kept constant.
Experiment 1 has a confounding variable related to the mass of the rockets. Any variation in mass may cause a discrepancy in the distance traveled.
In: Statistics and Probability
For a particular DRAM design the cell capacitance is C,=50fF, Vpp=5 V and V=1.4 V. Each cell represents a capacitive load on the bit line of 2fF. The sense amplifier and other circuitry attached to the bit line has a 20fF. What is the maximum number of cells that can be attached to a bit line while ensuring a minimum bit line signal of 0.1 V? How many bits of row addressing can be used? If the sense amplifier gain is increased by a factor of 5 how many word line address bits can be accommodated.
In: Electrical Engineering
Answer the question for each lab test of the following:-
for example:-
Lab Test List
In: Nursing
For each of the following exercises, an experiment is give
n, followed by an event. Give the
sets that represent the sample space of the experiment and th
e event.
(a)
Experiment:
A coin is flipped once.
Event:
Heads is observed.
(b)
Experiment:
A coin is flipped three times.
Event:
At least two of the flips result in
heads.
(c)
Experiment:
A coin is flipped repeatedly until a head is obtained.
Event:
A head is
obtained in
less than
five flips.
(d)
Experiment:
The three letters A, B and C are arranged in all possible ways,
using each
letter exactly once.
Event:
The first letter is B.
In: Statistics and Probability
You have a 200 Ω resistor, a 0.400-H inductor. Suppose you take the resistor and inductor and make a series circuit with a voltage source that has voltage amplitude 30.0V and an angular frequency of 250 rad/s.
Parts A, B, C
For this R-L circuit graph v, vR, and vL versus t for t = 0 to t =
50.0 ms. The current is given by i=Icosωt, so v=Vcos(ωt+ϕ).
Part D
What are v, vR, and vL at t = 20.0ms?
Enter your answers numerically separated by commas.
v,vR,vL v , v R , v L = ?, ?, ? V
Part F
What are v, vR, and vL at t = 40.0ms?
Enter your answers numerically separated by commas.
v,vR,vL v , v R , v L = ?, ?, ? V
In: Physics
Suppose V is a finite dimensional inner product space. Prove that every orthogonal operator on V , i.e., <T(u),T(v)> = <u,v>, ∀u,v ∈ V , is an isomorphism.
In: Advanced Math
In: Computer Science
P8–14 Portfolio analysis You have been given the expected return
data shown in the first
table on three assets—F, G, and H—over the period 2016–2019.
Expected return
Year Asset F Asset G Asset H
2016 16% 17% 14%
2017 17 16 15
2018 18 15 16
2019 19 14 17
Alternative Investment
1 100% of asset F
2 50% of asset F and 50% of asset G
3 50% of asset F and 50% of asset H
Asset
Expected
return, r
Risk (standard
deviation), sr
V 8% 5%
W 13 10
Using these assets, you have isolated the three investment
alternatives shown in the
following table.
a. Calculate the expected return over the 4-year period for each of
the three
alternatives.
b. Calculate the standard deviation of returns over the 4-year
period for each of the
three alternatives.
c. Use your findings in parts a and b to calculate the coefficient
of variation for
each of the three alternatives.
d. On the basis of your findings, which of the three investment
alternatives do you
recommend? Why?
In: Finance
Six sigma concepts, methodologies and tools
Describe the concept of Six Sigma for supply chain management.
Describe two benefits of creating and using a QFD(Quality Function Development) matrix.
Describe each part of the QFD matrix and how a QFD matrix is created.
Describe the steps for benchmarking.
Give brief descriptions of these Six Sigma tools and where they can be used;
Affinity diagram
Kano model
Pareto analysis
Brainstorming
Fishbone analysis
Process flow charts
Failure mode analysi
Design of experiment
In the DMAIC(Define, Measure, Analyse, Improve, Control) cycle, the final step can at times be overlooked. What does the final stage “control” hope to accomplish?
How does lean thinking generate process improvement and what are the advantages of integrating lean with six sigma?
Why is it a good idea to create value stream process maps?
Marking scheme for assignment as follows:
1. Relevance of work to questions or problems ( e.g. addresses
questions/focus or does the response answer the question?)
2. Quality of contents
• Has the topic been addressed critically and with depth?
• Are the key issues addressed?
3. Quality of structure and presentation
• Structured layout
• Definition of key terms
• Outline of argument..
4. Reference list
- In text references (Harvard style of referencing preferred)
- Use of quotation (author, date, page)...
In: Operations Management