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STatiana [176]
3 years ago
11

Consider the following schema:Suppliers (sid: integer, sname: varchar, address: varchar)Parts (pid: integer, pname: varchar, col

or: varchar)Catalog (sid: integer, pid: integer, cost: real)Where sid is the supplier’s id (primary key in Suppliers), pid is the part’s id (primary key in Parts), and sid together with pid is the primary key of Catalog. The Catalog relation lists the prices charged for parts by Suppliers.A) Write the following queries using relational algebra:5 Find the sids of suppliers who supply every part6. Find the sids of suppliers who supply every red part7. Find the sids of suppliers who supply every red or green part.8. Find the sids of suppliers who supply every red part or supply every green part
Engineering
1 answer:
Contact [7]3 years ago
6 0

Answer:

umm lemme check

Explanation:

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Can you tell me important facts about Peggy A. Whitson?
Nat2105 [25]

Answer:

- She’s A Biochemist

- She’s An Accomplished Space Chef

- She holds the record for most time spent in a space station for an American astronaut — of any gender.

- She became the first woman to command the International Space Station twice.

- She made apple pie out of tortillas

6 0
3 years ago
Read 2 more answers
what are 3 things you would like to get out of an ethical engineering class? and why? about a page explanation would do fine.
poizon [28]

Answer:

I don't know

Explanation:

i don't know

8 0
3 years ago
Read 2 more answers
Seawater containing 3.50 wt% salt passes through a series of 11 evaporators. Roughly equal quantities of water are vaporized in
statuscvo [17]

Answer: the mass flow rate of concentrated brine out of the process is 46,666.669 kg/hr

Explanation:

F, W and B are the fresh feed, brine and total water obtained

w = 2 x 10^4 L/h

we know that

F = W + B

we substitute

F = 2 x 10^4 + B

F = 20000 + B .................EQUA 1

solute

0.035F = 0.05B

B = 0.035F/0.05

B = 0.7F

now we substitute value of B in equation 1

F = 20000 + 0.7F

0.3F = 20000

F = 20000/0.3

F = 66666.67 kg/hr

B = 0.7F

B = 0.7 * F

B = 0.7 * 66666.67

B = 46,666.669 kg/hr

the mass flow rate of concentrated brine out of the process is 46,666.669 kg/hr

8 0
4 years ago
Mechanical clips are used to close bags and keep things together. Investigate the design of various paper clips, hair clips, and
pochemuha

Answer:

Hair clip: this used to hold human hairs together especially long hairs

The Design parameters to be considered are : number of teeth, durability of the material to be used and also the width ( how wide the clip can open )

Advantages : very easy to use, holds hairs tight

Disadvantages : Expensive and material used is sometimes brittle

paper clips : This used to hold papers together it is made of a thin elastic wire

The design parameters to be considered are : length of the wire, material to be used and the elasticity of the material

advantages : it is quite cheap and good strength

disadvantages :it can hold a limited amount of papers together

potato chip bag clips: These clips are used on potato chip bags to ensure that the bags are air tight

The design parameters to be considered are : Elasticity of the material to be used , and size

Advantages : it helps to prevent the potato chips from getting exposed to air

disadvantages : Not very popular and its quite expensive

Explanation:

Hair clip: this used to hold human hairs together especially long hairs

The Design parameters to be considered are : number of teeth, durability of the material to be used and also the width ( how wide the clip can open )

Advantages : very easy to use, holds hairs tight

Disadvantages : Expensive and material used is sometimes brittle

paper clips : This used to hold papers together it is made of a thin elastic wire

The design parameters to be considered are : length of the wire, material to be used and the elasticity of the material

advantages : it is quite cheap and good strength

disadvantages :it can hold a limited amount of papers together

potato chip bag clips: These clips are used on potato chip bags to ensure that the bags are air tight

The design parameters to be considered are : Elasticity of the material to be used , and size

Advantages : it helps to prevent the potato chips from getting exposed to air

disadvantages : Not very popular and its quite expensive

4 0
3 years ago
Technician A says that crush zones on a vehicle are designed to collapse in a controlled manner. Technician B says that reinforc
Ierofanga [76]

Answer:

only A

Explanation:

3 0
3 years ago
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