Arks Specify the following queries in $S, on the database schema of Nigure 1. (5 marks) Retrieve the names of students who took only one comrae in the Spring 2020 semester. marks] Retrieve the names of all students who have mo majors (i.e., double major students).

Answer:

True

Explanation:

Because a object is a smart thing to use doing them problem

Steel that contains 0.4-0.5 percent carbon, as well as small amounts of nickel, molybdenum, and chromium, is known as 4340 steel.

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Answer:

Explanation:

In the steady state total volume going out will be equal to total volume coming in , and

total salt coming in = total salt going out

Total volume coming in per minute = 2000 + 2 x 10³ x 60

= 122000 L .

Total salt coming in per minute = 1200 x 2000 + 20  x 2 x 10³ x 60

= 2400000 + 2400000 mg

= 4800000 mg

volume of water going out per minute = 122000 L

Total salt going out  per minute = 4800000 mg

concentration of water going out = 4800000 / 122000

= 39.344 mg / L

Answer:

up up down down

Explanation:

left right left right b a select start

A bipolar pulse-width modulation (PWM) signal is a type of digital signal that has a magnitude of 32 volts with ± 32-volt limits. The period of the signal is 0.5 seconds. the average output voltage is 8 volts is 0.125 second.

We want to find the value of tp in seconds when the average output voltage is 8 volts. The duty cycle represents the percentage of time the signal is in the "on" state compared to the total period. In this case, the average output voltage of 8 volts indicates that the signal spends 25% of the time in the "on" state (8 volts is 25% of 32 volts). Therefore, the duty cycle is 25%. The duty cycle (D) is related to the pulse width (tp) and the period (T) by the equation:

D = tp / T

We know the period (T) is 0.5 seconds, and the duty cycle (D) is 25%. Let's substitute these values into the equation and solve for tp:

0.25 = tp / 0.5

Rearranging the equation, we have:

tp = 0.25 * 0.5 = 0.125 seconds

Therefore, the value of tp, the pulse width of the bipolar PWM signal, is 0.125 seconds when the average output voltage is 8 volts.

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Answer:

Linux is a open source OS

The tool that has a revolving vertical shaft and a cutter is a router. The correct option is b.

There are many different kinds of power tools, including portable power tools like a circular saw, heat guns, and wall chasers as well as electrical power tools like impact wrenches, lathes, power drills, power ratchet sets, and power saws.

Power tools including circular saws, jigsaws, drills, hammer drills, sanders, grinders, routers, and many others reduce labor and time requirements. The requirement for knowledge of the risks that power tools provide if used improperly is raised due to their rising use.

A power tool called a router has a flat base and a spinning blade that protrudes beyond the base. An electric motor or a pneumatic motor can drive the spindle.

Therefore, the correct option is b) router.

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Answer:

rotation

Explanation:

I just answered this!

The expression for the pressure gradient is given below: (image)

Pressure gradient denotes the alteration in atmospheric pressure over an indicated distance. Essentially, it measures how quickly the pressure changes regarding distance, figuring by dividing the variation of pressure by the range for which such alteration happens.

Regarding meteorology, the force and direction of winds closely associate to pressure gradient's influence. There exists a flow of air from high amounts of pressure towards low ones; thereby, a greater difference of pressure over a given distance results on far stronger winds causing effects.

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Answer:

...

Explanation:

...

Answer:

a) 0.033024 GPa

b)  482.6 MPa

Explanation:

Gauge length = 50 mm

Tensile load = 1032 N

extension of gauge length = 0.625 mm

Extent of load sustainable by sample = 2063 N

Assuming a cross section area = 2500 mm^2 = 0.0025 m^2

a) Determine the Elastic modulus of the Polymer

Elastic modulus = stress / strain  --------  ( 1 )

  = ( f/A / strain )

f/A = force / area = 1032 / 0.0025 m^2  = 4.128 * 10^5 N/m^2

strain = Δl / original l  = 0.625 / 50 = 0.0125

Back to equation 1 = 4.128 * 10^5 / 0.0125 = 3.3024 * 10^7 N/m^2

= 0.033024 GPa

b) determine yield strength of Polymer

бy = 482.6 MPa

attached below is the detailed solution

Asymmetric cryptographic algorithms are also known as private key cryptography is false.

Due of its openness, asymmetric key cryptography is sometimes known as public-key cryptography. This is in contrast to symmetric encryption, often known as private key cryptography, where the single key used for both encryption and decryption is meant to be kept secret.

Therefore, one can say that Asymmetric cryptography, commonly referred to as public-key cryptography, is a method for encrypting and decrypting messages and safeguarding them from unwanted access or use. It makes use of a pair of linked keys, a public key and a private key.

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Answer:

Step One: Know What Your Rocket Needs to Do. ...

Step Two: Establish Mission Parameters. ...

Step Three: Call in Experts. ...

Step Four: Start Drawing. ...

Step Five: Whittle Down the Possibilities. ...

Step Six: Pick the Best Design.

Explanation:

Hope this helps and thx for tha fwee pts

Answer:

risk = probability x loss

Explanation:

A PFAS anchorage point for a 6-foot lanyard must be able to hold a minimum static load of 5,000 pounds.

PFAS stands for Personal Fall Arrest System, which is a type of fall protection equipment that is designed to protect workers from falls.
The 5,000-pound minimum static load requirement is based on the assumption that the PFAS will experience a shock load of 2,500 pounds in the event of a fall.

This shock load is due to the force of the fall and the weight of the worker, and it puts a significant amount of stress on the anchorage point. The 5,000-pound minimum static load ensures that the anchorage point can withstand this shock load without failing.
It's important to note that the 5,000-pound minimum static load requirement is a general guideline, and the actual load capacity of the anchorage point will depend on a variety of factors, including the type of anchorage point, the material it's made from, and the conditions of use.

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The abbreviation for the plastic pipe used in hot and cold water supply systems is PEX.

PEX stands for cross-linked polyethylene, which is a type of plastic material commonly used in plumbing systems for hot and cold water supply. It has become increasingly popular in recent years due to its numerous advantages over traditional piping materials.

PEX pipes are highly flexible, making them easier to install compared to rigid pipes like copper or PVC. The flexibility allows for simpler routing and bending around obstacles, reducing the need for additional fittings and joints. This not only saves time during installation but also minimizes the risk of leaks since fewer connections are required.

In addition to its flexibility, PEX pipes are also resistant to corrosion and scale buildup. Unlike metal pipes, PEX does not rust or corrode over time, ensuring a longer lifespan for the plumbing system. The smooth interior surface of PEX pipes also helps prevent mineral deposits and scale formation, which can restrict water flow and affect performance.

Another advantage of PEX is its ability to withstand high temperatures. It is suitable for both hot and cold water applications, making it a versatile choice for residential and commercial plumbing systems. PEX pipes have excellent thermal conductivity, meaning they retain heat more effectively than metal pipes, resulting in less heat loss during water transportation.

Furthermore, PEX is known for its durability and resistance to freezing. It can expand and contract without cracking, making it ideal for regions with cold climates. This feature reduces the risk of burst pipes during freezing temperatures, providing added peace of mind for homeowners.

In conclusion, the abbreviation for the plastic pipe used in hot and cold water supply systems is PEX. PEX pipes offer flexibility, corrosion resistance, scale resistance, high-temperature tolerance, and durability. These characteristics make PEX a reliable and efficient choice for modern plumbing installations.

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Answer:

\(Length = 9558.7\ mils\)

Explanation:

Given

\(diameter = 82.2\ mils\)

\(Strands = 37\)

Required

The length of the wire

First, we calculate the circumference (C) of 1 strand of the wire

\(C = \pi d\)

\(C = \frac{22}{7} * 82.2\)

\(C = \frac{22* 82.2}{7}\)

\(C = \frac{1808.4}{7}\)

The length of the 37 strands is:

\(Length = 37 * C\)

\(Length = 37 * \frac{1808.4}{7}\)

\(Length = \frac{37 * 1808.4}{7}\)

\(Length = \frac{66910.8}{7}\)

\(Length = 9558.68571429\)

\(Length = 9558.7\ mils\) --- approximated

Less than 1% of the world's commercial energy is supplied by solar power.

Less than 1% of the world's commercial energy is supplied by solar power.

While solar energy has been growing in popularity and adoption in recent years, it still represents a small fraction of the world's total energy consumption.

Most of the world's energy is still derived from fossil fuels, including coal, oil, and natural gas, which are finite resources that contribute to greenhouse gas emissions and climate change.

However, the increasing affordability and efficiency of solar technology, combined with growing awareness of the need for sustainable energy sources, is driving continued growth in the solar industry.

Governments, businesses, and individuals around the world are investing in solar power as a way to reduce their carbon footprint and transition towards cleaner, more sustainable energy sources.

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Answer:

Dam they be thinking we racist

Explanation:

Answer:

XDDDD

Explanation:

XD I LOVE THIS MEME IM SAVING THIS TO MY GALLERY XD

Public land-use regulations may not be able to regulate c) construction costs, as these costs are typically determined by market factors.

The primary objective of these regulations is to ensure that development within a community is consistent with the overall goals and objectives of the community. These regulations help to ensure that development is safe, appropriate, and environmentally responsible.
In general, public land-use regulations may regulate a variety of aspects related to land-use and development, including setback lines, minimum lot size, building heights, and other similar factors. However, it is important to note that there are certain aspects of development that public land-use regulations may not be able to regulate.
For example, public land-use regulations may not be able to regulate construction costs, as these costs are typically determined by market factors such as labor costs and material costs. Additionally, public land-use regulations may not be able to regulate certain aspects of building design, such as the architectural style or the choice of materials used in construction.
Overall, public land-use regulations play an important role in ensuring that development within a community is safe, appropriate, and environmentally responsible. While there are certain aspects of development that these regulations may not be able to regulate, they remain an essential tool for communities seeking to manage growth and development in a responsible and sustainable manner.

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(a) The mass flow rate of the air entering the control volume is 0.0651 lb/s.    (b) The exit flow area required for the given conditions is 0.0004775 ft².

a. In this problem, we are given the properties of air entering and exiting a control volume. To determine the mass flow rate, we need to apply the principle of mass conservation. By using the ideal gas law and assuming steady state operation, we can calculate the mass flow rate based on the given information, including the inlet and exit conditions, the gas constant, and the specific heat ratio of air.

To solve this problem, we can apply the conservation laws of mass and momentum. Let's go step by step.

(a) First, we need to find the mass flow rate (ṁ).

The mass flow rate can be calculated using the equation:

ṁ = ρ₁ * A₁ * V₁

where:

ṁ = mass flow rate

ρ₁ = density of air at inlet conditions

A₁ = inlet area

V₁ = inlet velocity

We need to find ρ₁, the density of air at inlet conditions. The ideal gas law can be used to calculate the density:

ρ₁ = P₁ / (R * T₁)

where:

P₁ = pressure at inlet conditions

R = specific gas constant

T₁ = temperature at inlet conditions

Given values:

P₁ = 116 psi

T₁ = 1080 °R

A₁ = 3.1 in²

V₁ = 131 ft/s

We need to convert the given values to consistent units before proceeding with the calculations.

Conversions:

P₁ = 116 psi = 116 * 144 lb/ft² = 16624 lb/ft²

T₁ = 1080 °R

A₁ = 3.1 in² = 3.1 / (12^2) ft² = 0.01736111 ft²

V₁ = 131 ft/s

Now we can calculate ρ₁:

ρ₁ = P₁ / (R * T₁)

= 16624 lb/ft² / (53.35 lb/(ft·°R) * 1080 °R)

≈ 0.288 lb/ft³

Now we can calculate the mass flow rate (ṁ):

ṁ = ρ₁ * A₁ * V₁

= 0.288 lb/ft³ * 0.01736111 ft² * 131 ft/s

≈ 0.0651 lb/s

So, the mass flow rate is approximately 0.0651 lb/s.

(b)  To find the exit flow area, we can use the equation of continuity, which states that the mass flow rate is equal to the product of density, velocity, and area. By rearranging the equation, we can solve for the exit flow area, considering the known values of mass flow rate, density, and exit velocity.

(b) Next, we need to find the exit flow area (A₂).

The mass flow rate (m) remains constant throughout the control volume, so we can write:

m = ρ₂ * A₂ * V₂

where:

ρ₂ = density of air at exit conditions

A₂ = exit area

V₂ = exit velocity

To find A₂, we need to rearrange the equation:

A₂ = m/ (ρ₂ * V₂)

We need to find ρ₂, the density of air at exit conditions. Using the ideal gas law:

ρ₂ = P₂ / (R * T₂)

where:

P₂ = pressure at exit conditions

T₂ = temperature at exit conditions

Given values:

P₂ = 29 psi = 29 * 144 lb/ft² = 4176 lb/ft²

T₂ = 720 °R

V₂ = 1148 ft/s

Conversions:

P₂ = 4176 lb/ft²

T₂ = 720 °R

V₂ = 1148 ft/s

Now we can calculate ρ₂:

ρ₂ = P₂ / (R * T₂)

= 4176 lb/ft² / (53.35 lb/(ft·°R) * 720 °R)

≈ 0.145 lb/ft³

Now we can calculate the exit flow area (A₂):

A₂ = ṁ / (ρ₂ * V₂)

= 0.0651 lb/s / (0.145 lb/ft³ * 1148 ft/s)

≈ 0.0004775 ft²

So, the exit flow area is approximately 0.0004775 ft².

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User

Provide final answer in 1-2 lines

ChatGPT

(a) The mass flow rate of the air entering the control volume is [insert calculated value] kg/s.

(b)) The mass flow rate of the air entering the control volume is [insert calculated value] kg/s.

In this problem, we are given the properties of air entering and exiting a control volume. To determine the mass flow rate, we need to apply the principle of mass conservation. By using the ideal gas law and assuming steady state operation, we can calculate the mass flow rate based on the given information, including the inlet and exit conditions, the gas constant, and the specific heat ratio of air.

(b) The exit flow area required for the given conditions is [insert calculated value] in2.

To find the exit flow area, we can use the equation of continuity, which states that the mass flow rate is equal to the product of density, velocity, and area. By rearranging the equation, we can solve for the exit flow area, considering the known values of mass flow rate, density, and exit velocity.

It is important to note that the calculations involve the assumption of ideal gas behavior for air and the steady state condition. Real-world factors such as turbulence, friction, and heat transfer may affect the accuracy of the results. Therefore, it is essential to consider these factors in more complex scenarios or actual engineering applications.

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Answer:

Static Model

Explanation:

The rate of heat transfer by the air conditioner using constant specific heat of 1.004kj/kg.K is 15.06 kW.

Rate of heat transfer is the power rating of the machine.

Work done and changes in potential and kinetic energy are neglected since it is a steady state process.

The specific heat in terms of specific heat capacity and temperature change is given as:

\(q_{out} = Cp(Ti - Te)\)

\(q_{out} = 1.004(30 - 10) = 20.08 kJ/kg \\ \)

The rate of heat transfer, is then determined as follows:

Qout = 0.75 × 20.08 = 15.06 kW

Therefore, the rate of heat transfer by the air conditioner is 15.06 kW.

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The model is built layer by layer using a process known as vat polymerization, which uses a vat of liquid photopolymer resin.

After each new layer is dried, an ultraviolet (UV) light is used to cure or harden the resin as necessary, and a platform is utilized to move the object being created downward. Unlike powder-based methods, which provide support from the unbound material throughout the build phase, the procedure employs liquid to produce objects, hence no structural support is provided during this phase. There will likely need to be additional support mechanisms in this situation. Photopolymerization (Gibson et al., 2010) or UV light is used to cure resins. To do this, motor-controlled mirrors are used to direct the light across the resin's surface.

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A project that requires using a pleater, a ruffling foot, or a gathering foot is the creation of a dress.

A pleater, a ruffling foot, and a gathering foot are all accessories for sewing machines or machines themselves that help fashion designers to give the fabric a different shape or texture, and therefore create unique pieces.

All of the tools can be used in the creation of a dress, for example, a pleater can be used in the top section of the dress to give it a nice texture and make it different from the skirt. In the same way, others such as the ruffling foot or the gathering foot can be used in the sleeves of the dress.

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The time (in seconds) required for the transformation in this new steel to reach 75% completion will be 90sec.

What is steel?

Steel is an iron alloy with additional carbon to increase its durability and fracture resistance when compared to other kinds of iron. Many other elements may exist or be added. Corrosion and oxidation-resistant stainless steels typically require an additional 11% chromium. Steel is utilised in structures, infrastructure, tools, ships, trains, cars, machinery, electrical appliances, weaponry, and rockets due to its great tensile strength and inexpensive cost.

By aurami relationship,

fβ(t) = 1-e(-kt⁴)

so, 0.95 = 1-e(-4.46×10⁻⁴× t⁴)

-0.05= -e(-4.46×10⁻⁴× t⁴)

ln(0.05)= -4.46×10⁻⁴× t⁴

-2.9957= -4.46×10⁻⁴× t⁴

0.6716×10⁻⁴ = t⁴

t= 0.905×10sec

=9.05sec

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