Heinrich hertz used properties of which type of wave to support the idea that light is also made of waves?.

(1) The voltage drop in the second resistor is 10 V.

(2) The voltage drop across each resistor will all double to match change in resistance.

The given parameters:

The total voltage in a series circuit is given as;

\(V_T = IR_1 + IR_2\\\\V_T = V_1 + V_2\)

The voltage drop in the second resistor is calculated as follows;

\(V_2 = V_T - V_1\\\\V_2 = 15 - 5\\\\V_2 = 10 \ V\)

(2)

The resistance of the circuit:

\(R = \frac{V}{I} = \frac{10}{2} = 5 \ ohms\)

When the total resistance is doubled;

In series circuit, the current in each resistor is constant, the voltage drop is calculated as;

\(V = IR\\\\V = 2 (5+5)\\\\V = 20 \ V\)

Thus, we can conclude that the voltage drop across each resistor will all double to match change in resistance.

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Answer:

D . goggles, a lab coat, heat-proof gloves, and close-toed shoes

Explanation:

Answer:

goggles, a lab coat, heat-proof gloves, and close-toed shoes

Explanation:

Answer

U Max velocity= Potential energy= kinetic energy

The potential energy is the product of mass * acceleration due to gravity * height

The kinetic energy is the product of 1/2 mass* square of velocity.

Max Velocity=mgh= 1/2mv^2

Mass is given as 62kg, height =1.2m and g= 9.8m/s^2

62kg* 9.8m/s^2*1.2= 1/2*62kg* v^2

729.12=31v^2

V^2= 729.12/31 =23.52

V^2=square root of 23.52

V= 4.85m/s

The differential equation which describes the temperature of the object over time is;

dH/dt = -k (H-S), where k = 0.97. The solution to this differential equation is given by H(t) = S + 65e^(-0.97t).

Newton’s law of heating and cooling is an application of the first law of thermodynamics. The law suggests that the rate of change of temperature of an object is proportional to the difference between its temperature and the temperature of the surroundings.

A warm object is placed in a refrigerator where the surrounding temperature is cooler, and the temperature of the object decreases. This phenomenon can be explained using differential equations. Given that H(t) is the temperature of the object being cooled and S is the surrounding temperature, the differential equation which describes the temperature of the object over time is given by;dH/dt = -k (H-S)

where k is the constant of proportionality.To solve this differential equation, we can use separation of variables, such that;

dH/dt = -k (H-S)dH/(H-S) = -k dt

Integrating both sides, we get;ln|H-S| = -kt + Cwhere C is the constant of integration.Rearranging, we have;

|H-S| = e^(-kt+C)

At time, t = 0, H = 100 and after 30 minutes the object is 75 degrees; t = 0.5 hours, H = 75. We can use these values to solve for C and k as follows;

|100-35| = e^(C) => 65 = e^(C)     …(1)

and|75-35| = e^(-0.5k+C) => 40 = e^(C) e^(-0.5k) => e^(-0.5k) = 40/65 => e^(-0.5k) = 8/13 => -0.5k = ln(8/13) => k = -2ln(8/13) => k = 0.97    …(2)

Substituting equation (1) into (2), we get;H-S = 65e^(-0.97t)  =>  H(t) = S + 65e^(-0.97t)

Therefore, the differential equation which describes the temperature of the object over time is;dH/dt = -k (H-S), where k = 0.97.

The solution to this differential equation is given by H(t) = S + 65e^(-0.97t).

The differential equation which describes the temperature of the object over time is;

dH/dt = -k (H-S), where k = 0.97. The solution to this differential equation is given by H(t) = S + 65e^(-0.97t).

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Answer:25

Explanation:

Formula(77°F − 32) × 5/9 = 25°C

Answer: The answer is C. 298 K

Explanation:

Answer B. the direction of force is the same

Answer:

10 m/per second

Explanation:

he speeds up 10 m in a single second

This is a hypoeutectoid alloy because the mass fraction of carbon is less than the eutectoid composition of 0.8%.

What is hypoeutectoid?
The ductility of the eutectoid alloy has decreased by the a factor of three, while that of the hypoeutectoid steel has decreased by the a factor of three. The additional, fragile cementite just on pearlite grain boundaries in hyper-eutectoid alloys reduces the alloy's ductility even more. The proeutectoid cementite limits fracture to the fragile grain boundary zone and limits plastic deformation to a ferrite lamellae inside the pearlite. Such alloys must be chosen for their composition to balance such properties to the requirements of the design in order to be used in light-strong structures. Although a front fork on the a bicycle must meet certain requirements, one of those requirements is high toughness, which necessitates tailoring this same carbon content to provide the required ductility.

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Answer: Pluto and Eris

Answer:

ceres

Explanation:

The acceleration with which an object falls through a fluid decreases as the speed of the object increases under gravity, to the point where the speed becomes constant, which is known as the terminal speed of the object

The unknown parameters are the mass of the feather, the density of the air, the feather's projected area and the coefficient of drag

The reason the above selected parameters are the correct unknowns is as follows;

The known parameter;

The speed of the feather the student drops off the building's top = 1.5 m/s

The required parameter;

The unknown parameters

Method;

Determine the terminal velocity parameters of the feather

The terminal velocity, \(\mathbf{V_t}\), of an item is the maximum steady speed the item reaches as it falls through a fluid. The terminal velocity of the feather is given by the following equation

\(Terminal \ velocity, V_t = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}\)

Where;

\(\mathbf{V_t}\) = Terminal velocity = The constant speed of the feather

m = Mass of the feather

g = Gravitational acceleration

ρ = Air density

A = The feather's projected area

\(C_d\) = Drag coefficient

The average speed of the feather = 1.5 m/s = The feathers typical or most common speed = The terminal velocity of the feather, \(\mathbf{V_t}\);

Plugging in \(\mathbf{V_t}\) = 1.5 m/s gives;

\(V_t = 1.5 \ m/s = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}\)

Therefore, the unknown parameters with regard to the feather falling are the parameters that are to be specified, including;

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After the Big Bang, it took the universe 3 minutes to become cool enough for neutral atoms to form.

During the first moment, immediately after the Big Bang, the universe was too hot for nuclei and electrons to combine into the kinds of neutral atoms that are familiar to us today.

In the first three minutes after the Big Bang, these protons and neutrons began fusing together, forming deuterium also known as heavy hydrogen.

Thus, after the Big Bang, it took the universe 3 minutes to become cool enough for neutral atoms to form.

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Answer:

decigram milligram gram decagram kilogram

The student weighing 5. 4 × 102 newtons takes 15 seconds to run up a hill would develops a power of 36 watts during her run, if the top of the hill is 10 meters vertically above her starting point .

Power is defined as the rate at which work is done or energy is transferred. It can be calculated using the equation:
Power = Work/Time.
In this case, the work done by the student is equal to the force applied (weight) multiplied by the displacement. The weight of the student is given as 5.4 × 10^2 newtons, and the displacement is 10 meters (vertical height of the hill).
The work done can be calculated as: Work = Force × Displacement = (5.4 × 10^2 N) × (10 m) = 5400 joules.
The time taken is given as 15 seconds.
Therefore, the power developed by the student is: Power = Work/Time = 5400 J / 15 s = 360 watts.
Thus, the student develops a power of 36 watts during her run.

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The formula for the magnitude of the average induced emf on the inductor is εave = (L * I) / Δt.


Part (a) To express the magnitude of the average induced emf on the inductor, εave, in terms of L, I, and Δt, you can use the formula: εave = (L * ΔI) / Δt, where ΔI is the change in current.
Since the current goes to zero when the switch is opened, the change in current is ΔI = I - 0 = I. So, the formula becomes εave = (L * I) / Δt.
Part (a) The formula to express the magnitude of the average induced emf on the inductor is εave = (L * I) / Δt.
Part (b) To calculate the numerical value of εave in volts, plug in the given values: L = 9.5 H, I = 0.45 A, and Δt = 0.12 s.
εave = (9.5 * 0.45) / 0.12 = 35.625 V

SUMMARY:
Part (a) The formula for the magnitude of the average induced emf on the inductor is εave = (L * I) / Δt.
Part (b) The numerical value of εave is 35.625 volts.

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Answer:

Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations.

Answer:

yes

Explanation:

it damages your lungs

Answer:

yes it can mess you lungs up real bad

In the worm gearset system, the electric motor's speed of 1800 rpm has to be reduced to 50 rpm while meeting the strength requirements. 2r = 6 inchesr = 3 inches.So, the crank radius should be 3 inches. The CAD drawing of the complete system can be made using any CAD software.

It's required to select a worm gearset that meets these requirements. In order to couple the output of the worm gear, a gear train that yields a train value of +50:1 is designed. From interference criteria, no gear should have fewer than 15 teeth, and no gear can have more than 75 teeth due to size restrictions.

the circumference of each crank revolution is 2πr, and the slider travels a distance of 2 inches for each revolution, the crank angle for each stroke is given by2/2πr = θ radians. The crank's total angle of rotation for one complete revolution is 2π radians. So, the crank shaper's total angle of rotation for three full strokes and one full return stroke is 6θ + 2π. Therefore,6θ + 2π = 4π.θ = (4π - 2π)/6 = π/3.Therefore, the crank angle for each stroke is π/3 radians. Since the crank radius is r, the maximum displacement of the slider is 2r.

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Answer:

B. Crest

Explanation:

The high point of a transverse wave is a called the crest.

Answer:

. A long-term goal is a goal set for you to achieve with 3-5 years, while short-term goals take a few days, weeks, or maybe months. An example of a short-term is eating like less carbs. An example of a long-term running like a 5k marathon.

This research investigates the effectiveness of LoRa technology in environmental monitoring, aiming to develop efficient and scalable systems for sustainable data collection and analysis. Topics include performance evaluation, energy efficiency, IoT integration, network planning, security, challenging conditions analysis, wildlife monitoring, and GIS integration.

Research Topic: "Design and Optimization of LoRa-Based Environmental Monitoring Systems for Sustainable Development"

1. Investigating the Performance of LoRa Technology in Environmental Monitoring: This research aims to evaluate the effectiveness of LoRa (Long Range) technology in collecting and transmitting environmental data, such as air quality, temperature, humidity, and noise levels. The study can explore the range, power consumption, data rate, and reliability of LoRa-based sensors in different environmental conditions.

2. Energy-Efficient LoRa Network Design for Environmental Monitoring: This research focuses on developing energy-efficient LoRa network architectures and protocols for environmental monitoring applications. The study can involve designing low-power LoRa nodes, optimizing transmission schedules, and exploring energy harvesting techniques to prolong the lifetime of the monitoring system.

3. Integration of LoRa with IoT for Smart Environmental Monitoring: This research investigates the integration of LoRa with Internet of Things (IoT) platforms for comprehensive environmental monitoring. It can explore the design and implementation of a scalable and interoperable IoT architecture that combines LoRa-based sensor nodes, data aggregation, cloud computing, and data analytics for real-time environmental monitoring and decision-making.

4. LoRa Network Planning and Deployment for Large-scale Environmental Monitoring: This research focuses on the planning and deployment strategies for large-scale LoRa networks dedicated to environmental monitoring. The study can include optimizing the placement of LoRa gateways, designing efficient routing algorithms, and addressing scalability and coverage challenges to ensure reliable data collection across vast geographical areas.

5. Security and Privacy Considerations in LoRa-based Environmental Monitoring Systems: This research addresses the security and privacy challenges associated with LoRa-based environmental monitoring systems. It can involve investigating encryption techniques, authentication protocols, and data anonymization methods to protect sensitive environmental data from unauthorized access and ensure compliance with privacy regulations.

6. Performance Analysis of LoRa-based Sensor Networks in Challenging Environmental Conditions: This research focuses on analyzing the performance of LoRa-based sensor networks in challenging environmental conditions such as urban environments, remote areas, or harsh climatic conditions. The study can involve evaluating signal propagation, interference effects, and data reliability to understand the limitations and potential enhancements of LoRa technology in such scenarios.

7. LoRa-Based Wildlife Monitoring Systems for Biodiversity Conservation: This research explores the design and implementation of LoRa-based monitoring systems for wildlife tracking and conservation. It can involve developing specialized LoRa sensors and network architectures to collect and transmit data on animal behavior, migration patterns, and habitat conditions, contributing to biodiversity conservation efforts.

8. Integration of LoRa with Geographic Information Systems (GIS) for Environmental Monitoring: This research investigates the integration of LoRa technology with Geographic Information Systems (GIS) for spatial analysis and visualization of environmental data. The study can focus on developing methods to efficiently collect and integrate LoRa-based sensor data with GIS databases, enabling better understanding and management of environmental resources.

Remember to further refine and narrow down the selected research topic based on your specific interests, available resources, and guidance from your academic advisor.

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If the net force on an object is zero, it will slide down an inclined plane at a constant velocity. This knowledge can be used to calculate the coefficient of kinetic friction between two objects.

The kinetic friction on a slope is denoted as f k = k m g cos. The change in velocity (v) over the change in time (t) is expressed by the equation a = v/t. This enables you to calculate how quickly velocity varies in meters per second squared (m/s2). The coefficient of friction (fr) is a quantity that represents the ratio of the frictional resistive force (Fr) divided by the normal or perpendicular force (N) pushing the objects together.

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Assuming you are supposed to write each conversion in scientific notation:

(2) 1 m = 100 cm, so

(67 cm) × (1/100 m/cm) = 67/100 m = 0.67 m = 6.7 × 10 ⁻¹ m

(3) 1 km = 1,000 m, so

(1.2 km) × (1000 m/km) = 1200 m = 1.2 × 10³ m

(4) 1 m = 1,000 mm = 10³ mm, so

(6.2 × 10 ⁻³ m) × (10³ mm/m) = 6.2 mm

(5) 1 m = 1,000,000,000 nm = 10⁹ nm, so

(4.05 × 10³ nm) × (1/10⁹ m/nm) = 4.05 × 10 ⁻⁶ m

(6) 1 g = 1,000,000 µg = 10⁶ µg, so

(3200 µg) × (1/10⁶ g/µg) = 3200 × 10 ⁻⁶ g = 3.2 × 10 ⁻³ g

The equation  a = Δv/Δt denotes acceleration (a), which is the change in velocity (v) over the change in time (t).

When the acceleration is zero or the speed is constant, instantaneous and average velocities can both be equal. This is because all instantaneous velocities will be equal in this situation.

where v is the end velocity, u is the beginning velocity, an is the acceleration, and t is the time, and setting ag=9.8m/s2 (gravitational acceleration is now in the opposing direction of motion), we can see that the value of v gradually declines with time.

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Answer:

  cue ball final: 0.85 m/s at N65°W

  8-ball final: 1.27 m/s at N12°E

Explanation:

In a perfectly elastic collision, both momentum and energy are conserved. The momentum is the sum of products of mass and velocity. The energy is half the product of mass and the square of velocity. The difference of "particle" velocities changes sign as a consequence of the collision.

__

If we let the masses be m1 and m2, the corresponding initial velocities be v1 and v2, and the final velocities be u1 and u2, we have ...

  m1·u1 +m2·u2 = m1·v1 +m2·v2 . . . . . . . conservation of momentum

  u1 -u2 = v2 -v1 . . . . . . . . . . . . . . . relative velocity sign changes

This pair of linear equations can be solved for u1 and u2 in any of the usual ways to give ...

  u1 = v1(m1 -m2)/(m1 +m2) + v2(2·m2)/(m1 +m2)

  u2 = v2(m2 -m1)/(m1 +m2) +v1(2·m1)/(m1 +m2)

__

Using angle measures as clockwise from north, we are given ...

  cue ball: m1 = 0.17 kg, v1 = 1.2∠10° m/s

  eight ball: m2 = 0.15 kg, v2 = 0.89∠-70° m/s

A suitable calculator can find the final velocities using the above equations.

The first attachment shows the calculations using a TI-84 work-alike calculator.

  cue ball final: 0.85 m/s at N65°W

  8-ball final: 1.27 m/s at N12°E

The second attachment shows a vector diagram of the velocities.

The object is known as buleshift.

Object is a type of thing that can be seen or touch but it's is never alive .

When an object is moving to the  away from us, the light from the object is known as if the  redshift, and when an the  object is moving to the  towards us, the light from to  the object is known as of the  blueshift. Astronomers use by the  redshift and blueshift to deduce how far an object is away from Earth, in the  concept of key to charting by its  the universe's expansion.

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Point scope is one example of a geographic analysis element that falls under the term "spatial scope." All the Options are Correct. i.e., a, b, c, d are Correct.

Any number of attributes regarding a location can be included in spatial data. For instance, this may include a map, images, historical data, or anything else that would be judged important.

Generally speaking, depending on the specific analytic environment, any of the aforementioned might be referred to as spatial scope.  

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Considering the definition of zeros of a quadratic function, the time the ball will strike the ground is 3.484 seconds.

The points where a polynomial function crosses the axis of the independent term (x) represent the zeros of the function.

The roots or zeros of the quadratic function are those values ​​of x for which the expression is equal to 0. Graphically, the roots correspond to the abscissa of the points where the parabola intersects the x-axis.

In a quadratic function that has the form:

f(x)= ax² + bx + c

the zeros or roots are calculated by:

\(x1,x2=\frac{-b+-\sqrt{b^{2} -4*a*c} }{2*a}\)

To know the time the ball will strike the ground, yo need to calculated the zeros of the function h(t) = 2.6 + 55t - 16t²

Being:

the zeros or roots are calculated as:

\(x1=\frac{-55+\sqrt{55^{2} -4*(-16)*2.6} }{2*(-16)}\)

\(x1=\frac{-55+\sqrt{3191.4} }{2*(-16)}\)

\(x1=\frac{-55+56.4925}{-32}\)

x1= -0.047

and

\(x2=\frac{-55-\sqrt{55^{2} -4*(-16)*2.6} }{2*(-16)}\)

\(x2=\frac{-55-\sqrt{3191.4} }{2*(-16)}\)

\(x2=\frac{-55-56.4925}{-32}\)

x2= 3.484

Finally, since time is not negative, the time the ball will strike the ground is 3.484 seconds.

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For a successful final touch of a construction venture, key stakeholders consisting of the consumer/proprietor, architect/layout group, and creation contractor are crucial. Risk management is necessary to perceive and mitigate capacity risks, ensuring project success and minimizing disruption

The 3 important stakeholders for the development of a new mall in Alexandra are:

During the construction of an avenue in a particular network, the network is represented by:

Local Authorities: The local authorities, which include the municipal or city council, represent the community's pastimes. Their duties consist of engaging with the network to apprehend their needs and issues associated with the road construction project.

Before any sort of Civil Engineering mission is executed, the subsequent steps want to be taken to ensure the viability of the challenge:

The hierarchy of running for a contractor sporting out the development of a bridge typically consists of the subsequent degrees:

To draw the bar chart (also referred to as a Gantt chart) for a 50 km street creation undertaking with a duration of 10 days, the chart could represent the obligations and their respective intervals. However, a standard bar chart for an avenue creation undertaking may also include duties including surveying, excavation, laying subbase, paving, and street markings, amongst others.

The horizontal axis represents the timeline (in days), and the vertical axis represents the responsibilities. Each undertaking is represented with the aid of a horizontal bar that suggests its length.

Question 2 (10):

2.1 Risk control is vital in a venture for the following motives:

Overall, change management is important for figuring out, analyzing, and responding to risks in a systematic and proactive manner. It enables ensuring task success by using lowering uncertainties and maximizing opportunities for task delivery within the preferred parameters.

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