Questions
Find the volume of the solid of revolution that is formed by rotating the region bounded...

Find the volume of the solid of revolution that is formed by rotating the region bounded by the graphs of the equations given around the indicated line or axis
1.- y=9-x^2, y=0, around the x axis
2.- y=√x-1, x=5, y=0, around the x=5
3.- y=1-x, x=0, y=0, around the y= -2
4.- y=x^2, x=0, y=3, around the y axis

In: Math

1. The activation energy for the gas phase decomposition of dinitrogen pentoxide is 103 kJ. N2O5---------...

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...

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...

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,...

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​...

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...

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

X)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...

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.

  1. (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.

  2. (b) What are the number of poles and the number of (finite) zeros of G(z) ?

  3. (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.

  4. (d) Is the system G(z) bounded-input, bounded-output stable ? Explain your answer making

    reference to the stability boundary in the z-plane.

  5. (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.

  6. (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

List Customer and Product Without Sale In one list return, all customers who do not have...

List Customer and Product Without Sale

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.

Schema

Table: 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
email 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

Sample Data Tables

Table: customer

id customer_name city_id customer_address contact_person email 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...

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:

  • all the nodes whose values are less than number are at the front
  • all the nodes whose values are greater than number are at the rear
  • any nodes whose values are equal to number are in the middle


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