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In: Finance
1. What is the effect of sunlight falling on the titration vessel?
2. In the Volhard method, proper functioning of the indicator
requires that the sample solution be
acidic. Why?
3. Which dissolved ions are present in significant amounts in the
titrated solution:
(a) during titration of the excess silver?
(b) after adding an excess of KSCN?
4. Diethyl ether is effective at preventing fading of the
end-point. Explain why fading takes place
and why diethyl ether is effective at preventing it.
5. What would be the consequence of adding significantly more than
2 mL of the ferric ammonium
sulfate indicator?
6. Determine the %(w/w) of Cl in a solid sample. The sample
(0.3721g) was treated with 50.00
mL of 0.02051M AgNO3 after dissolving it in H2O. The excess Ag+ was
titrated with 24.21 mL
of 0.01997 M KSCN.
In: Chemistry
The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 84 inches and a standard deviation of 10 inches. What is the probability that the mean annual snowfall during 25 randomly picked years will exceed 86.8 inches?
Round your answer to four decimal places.
A.0.4192
B.0.0808
C.0.5808
D.0.0026
In: Statistics and Probability
Use StatCrunch to determine the count and percentage of observations falling in each of these intervals by following the instructions listed below or using another appropriate counting method. Properly label and list these counts and percentages in your document.
Start in the “Body Temp” data set. Go to Data Row Selection Interactive Tools. In the slider selectors box, click the variable Body Temp into the variable box. Then Click compute.
I got this answer:
68% of the data falls within one standard deviations
68% confidence interval of mean
=98.25+/-0.733
=(97.52, 98.98)
95% of the data falls within two standard deviations
95% confidence interval of mean
=98.25+/-2*0.733
=(96.78, 99.72)
99.7% of the data falls within three standard deviations
99.7% confidence interval of mean
=98.25+/-3*0.733
=(96.05, 100.45)
The box that appears has a slider under the words Body Temp that allows you to create ranges of temperatures that you determined in 4d. Use the slider to obtain the count by looking at the “# rows selected” presented in the first line of the box. Calculate the percentages from the counts you obtained.
I need the answer to this and the rest please!
Do each of the three percentages found in part 4e match to what the Empirical Rule predicts? State your answer in a sentence.
Suppose a new student with a body temperature of 98.6 degrees was recorded. Calculate the z-score of this ‘new’ body temperature and explain in a complete sentence what this z-score indicates.
In: Statistics and Probability
There was a demonstration I did our Zoom class with a falling magnet in a simple copper tube. Explain, in detail, the physics behind why the magnet slows its descent through the tube (it does not touch the sides). In your discussion be sure to explain why the magnet doesn't come to a stop in the tube and why it does not speed up. Your response should include at least 3 paragraphs to show your mastery of the material.
In: Physics
There was a demonstration I did our Zoom class with a falling magnet in a simple copper tube. Explain, in detail, the physics behind why the magnet slows its descent through the tube (it does not touch the sides). In your discussion be sure to explain why the magnet doesn't come to a stop in the tube and why it does not speed up. Your response should include at least 3 paragraphs to show your mastery of the material.
In: Physics
An apple falls from a tree and feels no air resistance. As it is falling, which of the following statement is correct?
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The apple’s momentum and apple-Earth mechanical energy are conserved. |
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Its kinetic energy is conserved |
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The apple’s momentum is conserved. |
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The mechanical energy of the apple-Earth system is conserved. |
In: Physics
A recession is expected in the market next year with falling output accompanied by a slow in inflation. Draw one graph showing what this will do to the bond market, one graph to show what this will do to the money market (explain whats going to happen to the market interest rate). explain how both of the markets are associated.
In: Economics
In a particular country, it is known that college students
report falling in love an average of 2.20 times during their
college years. A sample of five college students originally from
that country but who have spent their entire college career in
Canada, were asked how many times they had fallen in love during
their college years. Their numbers were 2, 3, 5, 5, and 2.
Using the .05 significance level, do exchange students like these
who go to college in Canada fall in love more often than those who
complete their studies in their country of origin?
Use the hypothesis–testing steps to answer this.
In: Statistics and Probability
1. The turbine of a hydrostatic plant is driven by a falling
head of water from a falling head of water from a source 30 m high
up through a 600 mm penstock flowing full.
A. Evaluate the theoretical velocity of water as it hits the
turbine blades in m/sec.
B. Evaluate the theoretical discharge of water in
m3/s.
C.If the turbine is only 70% efficient, estimate the horsepower
available from it..
2. Reservoir A supplies water to a nozzle having a diameter of
80 mm which is discharge water 40 m below the reservoir water level
at a velocity of 24m/s
A. Determine the loss of head in the pipeline.
B. Determine the horsepower produced by the jet.
C. Determine the efficiency of the nozzle.
3. The diameter of a pipe carrying water changes gradually from
150 mm at A to 450 mm at B. A is 5 m lower than B. If the pressure
at A is 70 kPa and at B is 50 kPa when 150 liters/ sec is
flowing.
A. Determine the direction of flow
B. Determine the frictional loss between two points
4. Reservoir A and B have elevations of 100 m and 160 m respectively. A pump is installed near reservoir A to pump the water from A to B. The rate flow in the pipe is 650 liters/sec. If the head loss in the pipeline is 8.22 m, compute the horsepower required to pump the water to B.
5. A reservoir A contains water at an elevation of 45 m and a 50 mm pipe line leads downhill from the reservoir and discharges into air at B at an elevation 0. If the loss of head between the reservoir A and B is 43.5 m compute the discharge flowing in the pipe.
6. A turbine is located at an elevation 200 m below that of the surface of the water at intake. the friction loss in the pipeline leading to it is 8 m and the turbine efficiency is 90%. What will be the power delivered by the turbine if the flow is 3 m3/ sec in kW?
7. Water is discharged through a nozzle having a diameter of jet
100 mm at a velocity of 60 m/s at a point 240 m below the
reservoir.
A. Compute the total headloss.
B. Compute the horsepower produced by the jet.
C. Compute the power lost in friction.
In: Civil Engineering