In: Math
1. The activation energy for the gas phase
decomposition of dinitrogen pentoxide is
103 kJ.
N2O5---------
NO2 + 1/2 O2
The rate constant at 314 K is
2.76×10-4 /s. The rate constant will be
1.49×10-3 /s at -----------k
2. The activation energy for the gas phase
decomposition of dinitrogen pentoxide is
103 kJ.
N2O5-----------2
NO2 + 1/2 O2
The rate constant at 305 K is
8.40×10-5 /s. The rate constant will be
------- /s at 345 K.
In: Chemistry
Let S be the set of vectors in R4
S ={(1,1,-1,2),(1,0,1,3),(1,-3,2,2),(0,-2-1,-2)}
(a) State whether the vectors in the set are linearly
independent.
(b) Find the basis for S.
(c) Find the dimension of the column space (rank S).
(d) Find the dimension of the null space (nullity S).
(e) Find the basis for the null space of S?
In: Math
A first-order reaction has rate constants of 4.6 x 10-2 s-1 and 8.1 x 10-2 s-1 at 0 degrees celcius and 20 degrees celcius respectively. what is the value of the activation energy?
the answer should be 19 KJ/mol, i'm just very confused on the math has to be done to get this answer. could you please write out a step by step answer?
In: Chemistry
Sketch a graph of f(x)= -2(x-1)^2(x+1), based on all the data about zeros, long run behavior, etc.
In: Math
Given Barbara's estimated Cobb-Douglas utility function, U(q 1, q 2) = q 1^0.2 q 2^0.8, for CDs, q 1, and DVDs, q 2, derive her Engel curve for movie DVDs. Illustrate in a figure. Let p be the price of DVDs, $1.00 be the price of CDs, and Y be income. Barbara's Engel curve for movie DVDs is
Y= ? (Please provide answer)
(Properly format your expression using the tools in the palette. Hover over tools to see keyboard shortcuts.E.g., a subscript can be created with the _ character.)
In: Economics
|
Generals |
Warriors | ||
|
Student |
WAIS-IV Score |
Student |
WAIS-IV Score |
|
1 |
105 |
1 |
93 |
|
2 |
81 |
2 |
90 |
|
3 |
102 |
3 |
87 |
|
4 |
90 |
4 |
109 |
|
5 |
95 |
5 |
106 |
|
6 |
110 |
6 |
104 |
|
7 |
90 |
7 |
109 |
|
8 |
100 |
8 |
104 |
|
9 |
80 |
9 |
115 |
|
10 |
90 |
10 |
112 |
|
11 |
84 |
11 |
112 |
|
12 |
81 |
12 |
100 |
|
13 |
90 |
13 |
97 |
|
14 |
107 |
14 |
90 |
|
15 |
101 |
15 |
104 |
|
16 |
90 |
16 |
107 |
|
17 |
101 |
||
A. Complete the group frequency table.
Score The Generals (f) The Warriors (f)
80-89
90-99
100-109
110-119
B. Next, find the following for each team:
Generals (f) Warriors (f)
|
Mean |
||
|
Median |
||
|
Mode |
||
|
N |
||
|
N-1 |
||
|
ΣX |
||
|
(ΣX)2 |
||
|
ΣX2 |
||
|
S2X |
||
|
SX |
||
|
s2X |
||
|
sX |
c. What is the shape of distribution for the Generals? For the Warriors?
d. What is the range of scores that encompasses approx 68% of the scores surrounding the mean for EACH team?
e. Which distribution has a larger spread of scores? Why?
In: Statistics and Probability
Consider the following linear difference equation
yk −0.55yk−1 +0.12yk−2 +0.08yk−3 =xk−1 +1.5xk−2 ,
defined for integers k ≥ 0.
(a) Assuming that the initial conditions y−1 = y−2 = y−3 = 0, what is the z-domain transfer function G(z) of the linear system relating the z-transform Y (z) of the output sequence {yk} to the z-transform X(z) of the input sequence {xk} ? Express your answer as a ratio of polynomials in z.
(b) What are the number of poles and the number of (finite) zeros of G(z) ?
(c) Given that G(z) has a pole at z = −0.25, find the remaining poles, and the finite zeros of
G(z). Clearly indicate how you obtained the poles.
(d) Is the system G(z) bounded-input, bounded-output stable ? Explain your answer making
reference to the stability boundary in the z-plane.
(e) In your answer booklet, neatly sketch the pole-zero-gain plot of G(z) remembering to
include the leading co-efficient of the numerator polynomial.
(f) What are the transient response modes for G(z) ? Note : You are NOT required to determine residues, just the general form of each transient response mode. The response modes must be real-valued sequences.
In: Electrical Engineering
In one list return, all customers who do not have an invoice and
all products that were not sold. Use the UNION operator in this
query. Return 3 values:
- category - Is this line related to "customer" or "product"? Print
"customer" or "product" without quotes.
- id - customer.id (category="customer") or product.id (category="product")
- name - customer.customer_name (category="customer") or product.product_name (category="product")
Table definitions and a data sample are given below.
SchemaTable: customer
| column name | column type | key / NULL |
|---|---|---|
| id | int | PK |
| customer_name | varchar(255) | |
| city_id | int | FK |
| customer_address | varchar(255) | |
| contact_person | varchar(255) | N |
| varchar(128) | ||
| phone | varchar(128) |
Table: product
| column name | column type | key / NULL |
|---|---|---|
| id | int | PK |
| sku | varchar(32) | |
| product_name | varchar(128) | |
| product_description | text | |
| current_price | decimal(8,2) | |
| quantity_in_stock | int |
Table: invoice
| column name | column type | key / NULL |
|---|---|---|
| id | int | PK |
| invoice_number | varchar(255) | |
| customer_id | int | FK |
| user_account_id | int | |
| total_price | decimal(8,2) | |
| time_issued | varchar | N |
| time_due | varchar | N |
| time_paid | varchar | N |
| time_canceled | varchar | N |
| time_refunded | varchar | N |
invoice.customer_id references customer.id
Table: invoice_item
| column name | column type | key / NULL |
|---|---|---|
| id | int | PK |
| invoice_id | int | FK |
| product_id | int | FK |
| quantity | int | |
| price | decimal(8,2) | |
| line_total_price | decimal(8,2) |
invoice_item.invoice_id references invoice.id
invoice_item.product_id references product.id
Table: customer
| id | customer_name | city_id | customer_address | contact_person | phone | |
|---|---|---|---|---|---|---|
| 1 | Drogerie Wien | 1 | Deckergasse 15A | Emil Steinbach | [email protected] | 094234234 |
| 2 | Cosmetics Store | 4 | Watling Street 347 | Jeremy Corbyn | [email protected] | 093923923 |
| 3 | Kosmetikstudio | 3 | Rothenbaumchaussee 53 | Willy Brandt | [email protected] | 0941562222 |
| 4 | Neue Kosmetik | 1 | Karlsplatz 2 | NULL | [email protected] | 094109253 |
| 5 | Bio Kosmetik | 2 | Motzstraße 23 | Clara Zetkin | [email protected] | 093825825 |
| 6 | K-Wien | 1 | Kärntner Straße 204 | Maria Rauch-Kallat | [email protected] | 093427002 |
| 7 | Natural Cosmetics | 4 | Clerkenwell Road 14B | Glenda Jackson | [email protected] | 093555123 |
| 8 | Kosmetik Plus | 2 | Unter den Linden 1 | Angela Merkel | [email protected] | 094727727 |
| 9 | New Line Cosmetics | 4 | Devonshire Street 92 | Oliver Cromwell | [email protected] | 093202404 |
Table: product
| id | sku | product_name | product_description | current_price | quantity_in_stock |
|---|---|---|---|---|---|
| 1 | 330120 | Game Of Thrones - URBAN DECAY | Game Of Thrones Eyeshadow Palette | 65 | 122 |
| 2 | 330121 | Advanced Night Repair - ESTEE LAUDER | Advanced Night Repair Synchronized Recovery Complex II | 98 | 51 |
| 3 | 330122 | Rose Deep Hydration - FRESH | Rose Deep Hydration Facial Toner | 45 | 34 |
| 4 | 330123 | Pore-Perfecting Moisturizer - TATCHA | Pore-Perfecting Moisturizer & Cleanser Duo | 25 | 393 |
| 5 | 330124 | Capture Youth - DIOR | Capture Youth Serum Collection | 95 | 74 |
| 6 | 330125 | Slice of Glow - GLOW RECIPE | Slice of Glow Set | 45 | 40 |
| 7 | 330126 | Healthy Skin - KIEHL S SINCE 1851 | Healthy Skin Squad | 68 | 154 |
| 8 | 330127 | Power Pair! - IT COSMETICS | IT is Your Skincare Power Pair! Best-Selling Moisturizer & Eye Cream Duo | 80 | 0 |
| 9 | 330128 | Dewy Skin Mist - TATCHA | Limited Edition Dewy Skin Mist Mini | 20 | 281 |
| 10 | 330129 | Silk Pillowcase - SLIP | Silk Pillowcase Duo + Scrunchies Kit | 170 | 0 |
Table: invoice
| id | invoice_number | customer_id | user_account_id | total_price | time_issued | time_due | time_paid | time_canceled | time_refunded |
|---|---|---|---|---|---|---|---|---|---|
| 1 | in_25181b07ba800c8d2fc967fe991807d9 | 7 | 4 | 1436 | 7/20/2019 3:05:07 PM | 7/27/2019 3:05:07 PM | 7/25/2019 9:24:12 AM | NULL | NULL |
| 2 | 8fba0000fd456b27502b9f81e9d52481 | 9 | 2 | 1000 | 7/20/2019 3:07:11 PM | 7/27/2019 3:07:11 PM | 7/20/2019 3:10:32 PM | NULL | NULL |
| 3 | 3b6638118246b6bcfd3dfcd9be487599 | 3 | 2 | 360 | 7/20/2019 3:06:15 PM | 7/27/2019 3:06:15 PM | 7/31/2019 9:22:11 PM | NULL | NULL |
| 4 | dfe7f0a01a682196cac0120a9adbb550 | 5 | 2 | 1675 | 7/20/2019 3:06:34 PM | 7/27/2019 3:06:34 PM | NULL | NULL | NULL |
| 5 | 2a24cc2ad4440d698878a0a1a71f70fa | 6 | 2 | 9500 | 7/20/2019 3:06:42 PM | 7/27/2019 3:06:42 PM | NULL | 7/22/2019 11:17:02 AM | NULL |
| 6 | cbd304872ca6257716bcab8fc43204d7 | 4 | 2 | 150 | 7/20/2019 3:08:15 PM | 7/27/2019 3:08:15 PM | 7/27/2019 1:42:45 PM | NULL | 7/27/2019 2:11:20 PM |
Table: invoice_item
| id | invoice_id | product_id | quantity | price | line_total_price |
|---|---|---|---|---|---|
| 1 | 1 | 1 | 20 | 65 | 1300 |
| 2 | 1 | 7 | 2 | 68 | 136 |
| 3 | 1 | 5 | 10 | 100 | 1000 |
| 4 | 3 | 10 | 2 | 180 | 360 |
| 5 | 4 | 1 | 5 | 65 | 325 |
| 6 | 4 | 2 | 10 | 95 | 950 |
| 7 | 4 | 5 | 4 | 100 | 400 |
| 8 | 5 | 10 | 100 | 95 | 9500 |
| 9 | 6 | 4 | 6 | 25 | 150 |
The first 2 lines of the result should be:
category ("customer" or "product") id (customer.id or product.id) name (customer_name or product_name)
-> customer 2 Cosmetics Store
-> product 9 Dewy Skin Mist - TATCHA
In: Computer Science
Python Add your own implementation of the function rearrange_list
rearrange_list(linkedlist, number) returns the result of rearranging the nodes in linkedlist so that:
For example, given the linked list represented by
linkedlist = -2 -> -3 -> -1 -> 2 -> 3 -> 0 -> 4 -> 1 -> 5
then
rearrange_list(linkedlist, 2) == -2 -> -3 -> -1 -> 0 -> 1 -> 2 -> 3 -> 4 -> 5
You can see that all the numbers less than 2 now come before it, and all the numbers greater than 2 come after it. You can also see that the numbers maintain their relative position to each other, i.e. -2 and -3 and -1 don't change position relative to each other. This is an important characteristic, known as "stability". It also means that instead of requiring a full sort, you should be able to implement this algorithm in O(N) time.
You are given a simple Node class. Add your own implementation of the function rearrange_list (defined at the top level, not as part of the Node class)
In: Computer Science