Questions
Explain (in your own words) the shape of the Hayashi track for a pre-main sequence star,...
Explain (in your own words) the shape of the Hayashi track for a
pre-main sequence star, noting the
most important physical changes that occur in a star as it moves
from being a collapsing cloud of
gas to being a hydrogen burning main sequence star. Explain how
this varies for low and high mass
stars. What is the best wavelength range to detect pre-main
sequence stars, explain why.
Please answer all sections as they are about the same concept.
In: Physics
Sodium Borohydride Reduction of a Ketone 1. How will the dibenzalacetone product be isolated from the...
Sodium Borohydride Reduction of a Ketone
1. How will the dibenzalacetone product be isolated from the reaction mixture and how will it then be further purified? How will the product be characterized?
2. What apparatus and conditions (solvent, temp., reaction time, etc) will be used for the reaction?
3. Identify which is the reducing agent and which is the oxidizing agent in the reaction of benzophenone with sodium borohydride and explain your reasoning, ie. show the changes in oxidation states (best to give a drawing as per the introduction)?
In: Chemistry
The last step on Kotter’s Eight-Step Change Model is to anchor the changes in corporate culture; to make anything stick, it must become habit and part of the culture
11. The last step on Kotter’s Eight-Step Change Model is to anchor the changes in corporate culture; to make anything stick, it must become habit and part of the culture. Therefore, it is important to find opportunities to integrate security controls into day-to-day routines. Do you believe this to be true or false? Why?
12. In general, implementing security policies occurs in isolation from the business perspectives and organizational values that define the organization’s culture. Is this correct or incorrect? Why?
In: Computer Science
A 4% annual coupon bond has 5 years remaining until maturity and is priced to yield...
A 4% annual coupon bond has 5 years remaining until maturity and is priced to yield 6%.
(a) What is the price per 100 of par?
(b) For this bond, estimate the price value of a basis point by first considering an increase in yield and then a decrease in yield.
(c) Now show that for very small price changes, the absolute value of a bond’s price change does not differ much conditional on whether the yield change is a rise or a fall in yield.
Thanks
In: Finance
a) Define the following terms: (i) ferroelectric (ii) piezoelectric b)Draw perspective and plan views of the...
a) Define the following terms: (i) ferroelectric (ii) piezoelectric
b)Draw perspective and plan views of the unit cell of cubic barium titanate. Label the fractional co-ordinates of the non-equivalent ions and state the co-ordination number of the ions. [6 marks] (ii) Describe, with the aid of appropriate diagrams, the various structural changes which occur as a barium titanate crystal cools from 200°C to -100°C. Specify the temperatures of the relevant phase transitions.
In: Other
On the following graph, use the green point (triangle symbol) to plot the annual total revenue when the market price is $30, $45, $60, $75, $90, $105, and $120 per bike.
6. Elasticity and total revenue
The following graph shows the daily demand curve for bikes in Detroit.
Use the green rectangle (triangle symbols) to compute total revenue at varipus prices along the demand curve.
Note: You will not be graded on any changes made to this graph.
On the following graph, use the green point (triangle symbol) to plot the annual total revenue when the market price is $30, $45, $60, $75, $90, $105, and $120 per bike.
In: Economics
red phosphorus burns
a. Define standard enthalpy change of combustion.
b. When red phosphorus burns in oxygen the enthalpy change is –2967 kJ mol–1. For white phosphorus the enthalpy change is –2984 kJ mol–1. For both forms of phosphorus the reaction taking place is:
P4(s) + 5O2(g) → P4O10(s)
i. Use this information to calculate the enthalpy change for the transformation: P4(white) → P4(red).
ii. Represent these changes on an enthalpy profile diagram.
In: Chemistry
A natural gas storage tank is a cylinder with a moveable top. The volume of the...
A natural gas storage tank is a cylinder with a moveable top. The volume of the cylinder can change only as its height changes. Its radius remains fixed. The height of the cylinder is 22.3 m on a day when the temperature is 23 ∘C. The next day the height of the cylinder increases to 23.6 m as the gas expands because of a heat wave.
Find the temperature, assuming that the pressure and amount of gas in the storage tank have not changed.
Express your answer as an integer.
In: Chemistry
Look at these two functions f(x) = -x^2-x-6 g(x) = (x+1)(x^2+6x+9) a. Which function changes direction...
In: Math
A bond with a par value of $1,000 has a 6% coupon rate with semi-annual coupon...
A bond with a par value of $1,000 has a 6% coupon rate with semi-annual coupon payments made on July 1 and January 1. If the bond changes hands on November 1, which of the following is true with respect to accrued interest?
The buyer will pay the seller $20 of accrued interest
The seller will pay the buyer $20 of accrued interest
The buyer will pay the seller $10 of accrued interest
The seller will pay the buyer $10 of accrued interest
None of the above
In: Finance