Software Testing is a method to check whether the actual software product matches expected requirements and to ensure it is free from defect. It involves execution of software/system components using manual or automated tools to evaluate one or more properties of interest. The purpose of software testing is to identify errors, gaps or missing requirements in contrast to actual requirements. a) Find two (2) current journal articles (2021 and above) related to Software Testing. Provide the references of the articles using APA format with the links. [4marks] b) As a requirement engineer, your clients in ecotourism sectors are facing a big impact of the Covid-19 endemic. i. Suggest a computer-based system to help your client boost their business in this endemic phase and briefly explain the function of the system. [2 marks] ii. Based on your answer in 1 b) i., write a user story describing how the system can be used for some particular task that you need to state down (either to solve the problem or any function related to 1 b) i). [4 marks]

The Safety Data Sheets are designed to make it easier for employees to get health and safety information about chemicals (Option A). They are fundamental for handling hazardous chemicals.

Safety Data Sheets are pieces of useful information developed by a manufacturer of a hazardous chemical.

These sheets (safety data sheets) include different types of data including, among others, chemical properties; physical hazards, environmental hazards, etc.

Safety data sheets also include different measures for the safety and protection of overall health, which is often related to issues such as, for example, how to store and/or transport the target chemical.

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Matter can exist in different phases, namely solid, liquid, and gas. Let's compare and contrast these phases in terms of particle arrangement, motion, temperature, and phase changes. In a solid, particles are closely packed in a regular pattern, forming a fixed shape. The particles vibrate in their positions but don't move freely. Solid's temperature remains constant during a phase change.

Phase changes occur due to heat gained or lost. When heat is added, solids can melt into liquids (fusion) and liquids can vaporize into gases (vaporization). These processes require energy input to break intermolecular forces. When heat is removed, gases can condense into liquids (condensation) and liquids can freeze into solids (solidification). These processes release energy as heat is removed and intermolecular forces strengthen.

A heating/cooling curve illustrates the relationship between heat added/removed and temperature changes during phase changes. It typically shows temperature on the y-axis and time on the x-axis. The curve has flat portions where phase changes occur, indicating a constant temperature during those changes. I hope this helps! Let me know if you have any further questions.

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Answer: a drafting engineer

Explanation:

Answer:

I believe it would be to lower the troop seats.

Explanation:

Answer:

100 kWh

Explanation:

Since the freezer has a rating of 500 watts and runs for 200 hours in a month, the energy consumption can be gotten by getting the product of the rating of the freezer in kilowatts and the amount of time the fridge is on per month.

The rating of the freezer = 500 watts = 0.5 kW, time = 200 h

Energy consumption = rating * time = 0.5 kW * 200 h

Energy consumption = 100 kWh

Therefore the refrigerator uses 100 kWh per month

To find the pressure coefficient at a given point on an airfoil, we need to use the equation:
Cp = (\(P - P0) / (0.5 * ρ * V^2)\)

Where:
Cp is the pressure coefficient
P is the pressure at the given point on the airfoil\((9.4 x 10^4 N/m^2)\)
P0 is the free stream pressure (which is the same as the standard sea-level pressure)
ρ is the air density at standard sea-level conditions (around 1.225 kg/m^3)
V is the free stream velocity (60 m/s)

First, we need to find the value of P0, which is the standard sea-level pressure. This value is typically around 101325 Pa.

Next, we can substitute the given values into the equation:

Cp \(= (9.4 x 10^4 - P0) / (0.5 * 1.225 * 60^2)\)

Simplifying this expression gives us the value of the pressure coefficient at the given point on the airfoil.

Please note that the equation assumes incompressible flow, which is a valid assumption for many aerodynamic applications.

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Answer:

b

Explanation:

Answer:

for 13

Explanation:

''.''

Answer:

they are used for electrical currents so that they can flow along the appropriate wires in the circuit

Explanation:

To ensure safety and reliable electrical connections, polarized electrical receptacles are employed.

It is frequently seen in both residential and commercial structures and has two slots, one of which is broader than the other.

In a polarised outlet, the neutral slot is broader than the hot slot, which is smaller. To ensure that electrical appliances or gadgets are connected correctly and consistently, this design was created.

By ensuring a steady flow of energy through the instrument, polarization lowers the chance of electric shock.

Thus, it's crucial to remember that not all electrical appliances need polarized plugs.

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Answer:

a) 4.74 * 10^-23 cm^3

b)  8.9 g/cm^3

Explanation:

Given data :

Lattice parameter of copper = 0.362 nM

Atomic weight of copper = 63.54 g/mole

Given that copper forms a fcc structure

a) Calculate the volume of the unit cell

V = a^3

  = ( 0.362 * 10^-7  cm )^3 = 4.74 * 10^-23 cm^3

b) Calculate density of copper in g/cm^3

Density = ( n*A ) / ( Vc * NA) ----------- ( 1 )

where: NA = Avogadro's number = 6.022 * 10^23  atoms/mol

n = number of atoms per unit cell = 4

A = atomic weight = 63.54 g/mol

Vc = volume of unit cell =  4.74 * 10^-23 cm^3

Input values into equation 1

Density = 8.9 g/cm^3

spanish

Explanation:

the above question is written in spanish

Answer:

B....................

Identify risks: Cleaning hazardous liquid spills (medium likelihood, major severity), confined space rescue (high likelihood, moderate severity). Mitigate risks with PPE, training, protocols, and proper ventilation.

Step 1: Identify all associated risks:

a) Cleaning liquid cargo spilled from a container carrying dangerous goods (Class 5):

- Exposure to hazardous chemicals or substances in the spilled cargo.

- Risk of chemical burns or respiratory problems due to inhalation or contact with the dangerous goods.

- Slippery surfaces leading to falls and injuries.

- Fire or explosion risks if the spilled cargo is flammable or reactive.

b) Entering confined space to rescue an injured crew member (sprained ankle):

- Lack of oxygen or presence of toxic gases in the confined space.

- Risk of physical injuries due to confined space hazards such as uneven surfaces, low visibility, or falling objects.

- Difficulty in accessing and rescuing the crew member due to limited space.

Step 2: Classify the risks under the risk estimation framework:

The risk estimation framework can vary, but a commonly used approach is to assess risks based on their likelihood and severity. For each identified risk, assign a rating for likelihood (e.g., low, medium, high) and severity (e.g., minor, moderate, major).

Example:

- Cleaning liquid cargo spilled from a container carrying dangerous goods:

 - Likelihood: Medium

 - Severity: Major

- Entering confined space to rescue an injured crew member:

 - Likelihood: High

 - Severity: Moderate

Step 3: Develop strategies to mitigate the identified risks:

a) Cleaning liquid cargo spilled from a container carrying dangerous goods:

- Provide appropriate personal protective equipment (PPE) to workers involved in the cleanup.

- Train workers on proper handling and disposal procedures for hazardous materials.

- Implement spill containment measures and cleanup protocols.

- Conduct regular inspections and maintenance of containers to minimize the risk of spills.

b) Entering confined space to rescue an injured crew member:

- Assess the confined space for hazardous conditions and ensure proper ventilation before entry.

- Use a buddy system and have a standby person outside the confined space for communication and assistance.

- Equip the rescue team with appropriate PPE, including gas detectors, harnesses, and rescue equipment.

- Establish emergency response procedures and provide training to crew members on confined space rescue techniques.

It is important to note that risk assessment should be conducted by qualified professionals who have expertise in ship operations and safety regulations. The strategies mentioned above are general recommendations and may need to be tailored based on specific ship and task requirements. Regular reviews and updates of risk assessments should be conducted to ensure ongoing safety and compliance.

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The total power derived from the the plate that heats the room, given the temperature in the room would be  2.065 W.

To calculate the total power radiated from the plate, we'll use the Stefan-Boltzmann law:

P = ε x σ x A x (T_plate^4 - T_room^4)

First, let's convert the temperatures to Kelvin:

Tplate = 79°C + 273.15K = 352.15K

Troom = 22°C + 273.15K = 295.15K

Now, we can plug in the values into the Stefan-Boltzmann law:

P = 0.63 x (5.67 x 10^-8 W/(m^2 x K^4)) x 0.307 m^2 x (352.15^4 K^4 - 295.15^4 K^4)

P ≈ 8.638 x 10^-6 x 239103.81

P = 2.065 W

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Answer:

E

Explanation:

I have a big brain and I just took the test and got it correct.

Answer:

When are resistors in series? Resistors are in series whenever the flow of charge, called the current, must flow through devices sequentially. For example, if current flows through a person holding a screwdriver and into the Earth, then  

R

1

 in Figure 1(a) could be the resistance of the screwdriver’s shaft,  

R

2

 the resistance of its handle,  

R

3

 the person’s body resistance, and  

R

4

 the resistance of her shoes.

Figure 2 shows resistors in series connected to a voltage source. It seems reasonable that the total resistance is the sum of the individual resistances, considering that the current has to pass through each resistor in sequence. (This fact would be an advantage to a person wishing to avoid an electrical shock, who could reduce the current by wearing high-resistance rubber-soled shoes. It could be a disadvantage if one of the resistances were a faulty high-resistance cord to an appliance that would reduce the operating current.)

Two electrical circuits are compared. The first one has three resistors, R sub one, R sub two, and R sub three, connected in series with a voltage source V to form a closed circuit. The first circuit is equivalent to the second circuit, which has a single resistor R sub s connected to a voltage source V. Both circuits carry a current I, which starts from the positive end of the voltage source and moves in a clockwise direction around the circuit.

Figure 2. Three resistors connected in series to a battery (left) and the equivalent single or series resistance (right).

To verify that resistances in series do indeed add, let us consider the loss of electrical power, called a voltage drop, in each resistor in Figure 2.

According to Ohm’s law, the voltage drop,  

V

, across a resistor when a current flows through it is calculated using the equation  

V

=

I

R

, where  

I

 equals the current in amps (A) and  

R

 is the resistance in ohms  

(

Ω

)

. Another way to think of this is that  

V

 is the voltage necessary to make a current  

I

 flow through a resistance  

R

.

So the voltage drop across  

R

1

 is  

V

1

=

I

R

1

, that across  

R

2

 is  

V

2

=

I

R

2

, and that across  

R

3

 is  

V

3

=

I

R

3

. The sum of these voltages equals the voltage output of the source; that is,

V

=

V

1

+

V

2

+

V

3

.

This equation is based on the conservation of energy and conservation of charge. Electrical potential energy can be described by the equation  

P

E

=

q

V

, where  

q

 is the electric charge and  

V

 is the voltage. Thus the energy supplied by the source is  

q

V

, while that dissipated by the resistors is

q

V

1

+

q

V

2

+

q

V

3

.

Explanation:

You should wait until the traffic has cleared, and it is safe to make a left turn. Follow all traffic signals and use caution when making a left turn. Be sure to check for pedestrians and other vehicles in the intersection before making the turn.

When making a left turn at an intersection, it is important to exercise caution and follow the traffic signals. Before turning, one should be sure to check for any oncoming traffic, as well as pedestrians. If there is traffic present, one needs to wait until the traffic has cleared before making the turn. Additionally, it is important to ensure that there are no vehicles in the intersection that may impede the turn. Once it is safe to do so, it is important to signal the turn and proceed with caution. By taking these steps, one can ensure a safe and successful left turn at an intersection.

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Answer:

The answer is below

Explanation:

1) The synchronous speed of an induction motor is the speed of the magnetic field of the stator. It is given by:

\(n_s=\frac{120f_s}{p}\\ Where\ p\ is \ the \ number\ of\ machine\ pole, f_s\ is\ the\ supply \ frequency\\and\ n_s\ is \ the \ synchronous\ speed(speed \ of\ stator\ magnetic \ field)\\Given: f_s=60\ Hz, p=4. Therefore\\\\n_s=\frac{120*60}{4}=1800\ rpm\)

2) The speed of the rotor is the motor speed. The slip is given by:

\(Slip=\frac{n_s-n_m}{n_s}. \\ n_m\ is\ the \ motor\ speed(rotor\ speed)\\Slip = 0.05, n_s= 1800\ rpm\\ \\0.05=\frac{1800-n_m}{1800}\\\\ 1800-n_m=90\\\\n_m=1800-90=1710\ rpm\)

3) The frequency of the rotor is given as:

\(f_r=slip*f_s\\f_r=0.04*60=2.4\ Hz\)

4) At standstill, the speed of the motor is 0, therefore the slip is 1.

The frequency of the rotor is given as:

\(f_r=slip*f_s\\f_r=1*60=60\ Hz\)

Thomas is checking an electrical wire in a washroom with a wet floor. Ground-fault circuit interrupters in the electrical wire will help prevent electrical shock.

The ground-fault circuit interrupter, or GFCI, is a quick-response circuit breaker that may cut off electricity in as little as 1/40 of a second in the event of a ground fault.

It compares the current flowing into and out of the machinery along the conductors of the circuit.

Therefore, electrical shock can be avoided with the aid of ground-fault circuit interrupters in the electrical line.

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The wired networking standard that specifies the order in which data is sent through the network is Ethernet.

Ethernet is a widely used wired networking standard that defines the protocols and specifications for data transmission over a local area network (LAN). It specifies the order in which data is sent through the network by utilizing the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) algorithm.

The CSMA/CD algorithm ensures that multiple devices connected to an Ethernet network can share the same communication medium without interfering with each other. Before transmitting data, a device using Ethernet listens to the network to detect if it is clear to send data. If the network is busy, it waits for an opportune moment. Once the network is clear, the device sends the data, constantly monitoring for collisions. If a collision occurs (when two or more devices transmit data simultaneously), they stop transmitting, wait for a random period of time, and then retry.

By following this protocol, Ethernet ensures orderly and efficient data transmission within the network, minimizing collisions and maximizing data throughput. It has become the de facto standard for wired local area networks due to its reliability, scalability, and widespread adoption.

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Explanation:

R = √(A²+B²–2ABCos(x°))

x⁰ = 180–135

x° = 45°

R = √(350²+180²–2(350(180))Cos(45)))

R = 256.524

Answer:

whatsthe question choices

Answer:

For  lower disk :   V = e^θ​rω(0)/h  = 0

At the upper disk:  V = e^θ​rω(h)/h  = e^θ​rω

Hence The physical boundary conditions are satisfied

Explanation:

Velocity field ( V ) = e^θ​rωz/h

Upper disk located at  z = h

Determine the dimensions of the velocity field

velocity field is two-dimensional ; V = V( r , z )

applying the no-slip condition

condition : The no-slip condition must be satisfied

For  lower disk Vo = 0 when disk is at rest z = 0

∴  V = e^θ​rω(0)/h  = 0

At the upper disk  V = e^θ​rω  given that a upper disk it rotates at z = h

∴ V = e^θ​rω(h)/h  = e^θ​rω

Hence we can conclude that the velocity field satisfies the appropriate physical boundary conditions.

Answer:

Explanation:

The rotation speed depends on the force applied to the coil, and on the mass (moment of inertia) of the coil. The force can be increased by ...

  increasing the magnetic field strength

  increasing the coil current

And the moment of inertia can be decreased by ...

  making the coil lighter

  making the coil more compact.

Any of these changes will increase the rotation speed.

To calculate Young's modulus for this material, we first need to understand the relationship between stress and strain in the elastic region. According to Hooke's Law, stress is proportional to strain within the elastic limit.

This means that we can use the following equation to calculate Young's modulus: Young's modulus (E) = stress/strain In this case, the stress is 257 MPa and the strain is 0.18 mm/mm. Therefore: E = 257 MPa / 0.18 mm/mm E = 1428.9 MPa Rounding to the nearest whole number, Young's modulus for this material is approximately 1429 MPa. It's worth noting that this calculation assumes that the elastic region extends directly to zero stress and zero strain from the given point. In reality, the elastic region may have a non-linear relationship between stress and strain, and the material may exhibit some degree of plastic deformation before reaching zero stress. However, this calculation provides a good estimate of Young's modulus for the given conditions.

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The initial enthalpy and the entropy of the saturated water can be found out from the table of A-12E

i.e.   \($h_1= 101 \ \text{Btu/lbm}$\)

       \($s_1 = 0.22717 \text{ Btu/lbmR}$\)

Since the process mentioned above is an adiabatic compression process, the entropy will remain constant throughout the process. Therefore, we take the value of entropy and the final pressure using the table with few interpolations and also approximations to find the final enthalpy. It is given by :

       \($h_2= 116.09 \text{ Btu/lbm}$\)

So the work input from the energy balance equation :

       \($\dot{W} + \dot{m}h_1 = \dot{m}h_2$\)

          \($w=h_2 - h_1$\)

              = 116.09 - 101

              = 15.09

Therefore, \($w= 15.09 \text{ Btu/lbm}$\)

Answer:

Minimum electrical power required = 3.784 Watts

Minimum battery size needed = 3.03 Amp-hr

Explanation:

Temperature of the beverages, \(T_L = 36^0 F = 275.372 K\)

Outside temperature, \(T_H = 100^0F = 310.928 K\)

rate of insulation, \(Q = 100 Btu/h\)

To get the minimum electrical power required, use the relation below:

\(\frac{T_L}{T_H - T_L} = \frac{Q}{W} \\W = \frac{Q(T_H - T_L)}{T_L}\\W = \frac{100(310.928 - 275.372)}{275.372}\\W = 12.91 Btu/h\\1 Btu/h = 0.293071 W\\W = 12.91 * 0.293071\\W_{min} = 3.784 Watt\)

V = 5 V

Power = IV

\(W_{min} = I_{min} V\\3.784 = 5I_{min}\\I_{min} = \frac{3.784}{5} \\I_{min} = 0.7568 A\)

If the cooler is supposed to work for 4 hours, t = 4 hours

\(I_{min} = 0.7568 * 4\\I_{min} = 3.03 Amp-hr\)

Minimum battery size needed = 3.03 Amp-hr