• An electron, at rest, is accelerated through region 1, which has a 5000 V potential difference. It then enters region 2 where there is only a uniform magnetic field and it undergoes uniform circular motion (in a plane) of radius 0.954 mm. After subtending half a circle, the electron exits region 2, traveling in the opposite direction it was before entering region 2. (a) Draw a physical representation of this situation, complete with the direction of the electric and magnetic fields in the two regions. (b) Is the initial point of the electron in region 1 necessarily at zero electric potential? (c) Is the electric field from the potential difference in region 1 necessarily uniform? (d) What is the orientation of the magnetic field in region 2, relative to the plane of motion? (e) What is the speed of the electron when it exits region 2? (f) What is the strength of the magnetic field in region 2?
In: Physics
v
The City Commission of Nashville has decided to build a botanical garden and picnic area in the heart of the city for the recreation of its citizens. The precedence table for all the activities required to construct this area successfully is as follows:
|
Code |
Description |
Time (hrs) |
Immediate Predecessor(s) |
|
A |
Find location; determine resource requirements |
20 |
None |
|
B |
Requisition of lumber and sand |
60 |
A |
|
C |
Dig and grade |
100 |
A |
|
D |
Saw lumber into appropriate sizes |
30 |
B |
|
E |
Position lumber in correct locations |
20 |
D, C |
|
F |
Nail lumber together |
10 |
E |
|
G |
Put sand in and under the equipment |
20 |
F |
|
H |
Put dirt around the equipment |
10 |
F |
|
I |
Put grass all over the garden, landscape, paint |
30 |
G, H |
Refer to the legend
LOADING...
for the activity that corresponds to each code.
Using the line drawing tool, draw a Gantt chart for activites E through I of the project.
020406080100120140160180200IHGFEDCBA
In: Accounting
Read the summary of
the case Mitchell v. Fortis Insurance Company on page 291 of your
textbook. In a 500+ word paper, explain why this is a breach of
contract case. What kind of contract is this and who is the
breaching party? What kinds of damages are normally awarded for
breach of contract? Are punitive damages normally awarded in a case
of this type? Why did the court award punitive damages in this
case? Do you agree with this decision? Did the insurance company
behave ethically in this situation? Would you have suggested that
they do anything differently? Why or why not?
In: Economics
The role of the play-within-a-play in Act V of A Midsummer Night’s Dream is often debated. What effect does the craftsmen’s production of their play have on the tone of A Midsummer Night’s Dream as a whole? Does the Pyramus and Thisbe story have any significance to the central story, or is it simply a comical break?
In: Psychology
The indicator crystal violet, (V) reacts with NaOH (OH- ) according to the equation: CV(aq) + OH- (aq) → CV- (aq) (Violet) (Colorless) The rate law for the reaction is: Rate = k2 [CV] [NaOH]. In an experiment the concentration of NaOH exceeds that of the crystal violet by a factor of 1000 so the rate law becomes Rate = k1 [CV] where k1 = k2 [NaOH] . The following data were obtained for the reaction of crystal violet with the NaOH concentration at 0.00800M. The changes in [CV] were followed by measuring the absorbance (A) of the solution. To prove that the reaction is first order in CV, plot a graph of ln(Absorbance) versus time to see if it is linear. k1 is the negative slope of this graph and k2 is equal to k1 divided by the NaOH concentration used in the experiment.
Data
Time (min) Absorbance, (A) Ln(Absorbance)
0.00 0.840
8.00 0.680
12.0 0.640
17.0 0.560
21.0 0.500
25.0 0.460
30.0 0.410
Plot a graph of ln(Absorbance) versus time and determine the slope of the line. Is the reaction first order in CV? Explain your answer.
Evaluate k1 (pseudo first order rate constant) for the reaction if k1 = -(slope)
evaluate the overall rate constant , k2, for the reaction ij k2=k1/[NaOH]
In: Chemistry
The indicator crystal violet, (V) reacts with NaOH (OH- ) according to the equation: CV(aq) + OH- (aq) → CV- (aq) (Violet) (Colorless) The rate law for the reaction is: Rate = k2 [CV] [NaOH]. In an experiment the concentration of NaOH exceeds that of the crystal violet by a factor of 1000 so the rate law becomes Rate = k1 [CV] where k1 = k2 [NaOH] . The following data were obtained for the reaction of crystal violet with the NaOH concentration at 0.00800M. The changes in [CV] were followed by measuring the absorbance (A) of the solution. To prove that the reaction is first order in CV, plot a graph of ln(Absorbance) versus time to see if it is linear. k1 is the negative slope of this graph and k2 is equal to k1 divided by the NaOH concentration used in the experiment.
Data
Time (min) Absorbance, (A) Ln(Absorbance)
0.00 0.840
8.00 0.680
12.0 0.640
17.0 0.560
21.0 0.500
25.0 0.460
30.0 0.410
Plot a graph of ln(Absorbance) versus time and determine the slope of the line. Is the reaction first order in CV? Explain your answer.
Evaluate k1 (pseudo first order rate constant) for the reaction if k1 = -(slope)
evaluate the overall rate constant , k2, for the reaction ij k2=k1/[NaOH]
In: Chemistry
A 900 MW power station transmits power at a potential difference of 60, 000 V
a) Find the current.
b) Write down the equation for the resistance in terms of the resistivity.
c) If the power loss is 110 MW, over the length of the 200 km power line, find the resistivity of the line, if its cross section is 9 cm 2.
d) Write down the equation for the magnetic field due to a long conductor.
e) Find the strength of the magnetic field for the current in part a, 20 m from the line.
f) You take a length of the line and wind it tightly, to form a solenoid of length L= 0.6 m. How many turns are in the solenoid?
g) What is the field inside the solenoid?
In: Physics
Consider a galvanic cell based on the following half reactions:
|
E° (V) |
|
|
Al3+ + 3e- → Al |
-1.66 |
|
Ni2+ + 2e- → Ni |
-0.23 |
If this cell is set up at 25°C with [Ni2+] = 1.00 × 10-3M and [Al3+] = 2.00 × 10-2M, the expected cell potential is what?
In: Chemistry
Using the relationship for internal pressure πT = T (∂P/∂T)V – P, show that for a gas that obeys a truncated virial equation of state: Z = PVm/RT = 1 + B(T)/Vm, the internal pressure may be approximated as πT ≈ RT2(Vm)-2∙(ΔB/ΔT). Estimate the internal pressure at 1.0 bar and also at 10.0 bar for a hypothetical real gas at 275K given
that B(T) = -28.0 cm3⋅mol-1 at 250K and -15.6 cm3⋅mol-1 at 300K for this gas.
In: Chemistry
An atomic nucleus of mass m traveling with speed v collides elastically with a target particle of mass 2m (initially at rest) and is scattered at 90°. (a) At what angle does the target particle move after the collision? (b) What are the final speeds of the two particles? (c) What fraction of the initial kinetic energy is transferred to the target particle?
In: Physics