In your own words who discovered gadolinium

Answer:

Sustainable energy is essential to meet uncontrolled rising demand for energy, reduce pollution and shift to resources that can be used again and again.

Explanation:

Considering the Sustainable Goals floated by United Nation, it is essential for all countries to improve their score in all the SD goals.

One of the SD goal is to shift to sustainable energy.

Sustainable energy is essential from following three points

- Reuse of energy source again and again to outcome the fear of resource depletion

- Sustainable energy source shall ensure cleaner environment

- Sustainable energy sources are also essential to meet the rising consumption of energy with time all across the globe.

Some common examples are - Solar energy, Wind Energy, Energy from nuclear fuels etc.

The action spectrum is broader than the absorption spectrum because the action spectrum represents the overall efficiency of photosynthesis, while the absorption spectrum only shows the wavelengths of light absorbed by pigments.

In the action spectrum, a wider range of wavelengths contributes to photosynthesis, as it takes into account the energy conversion process and the involvement of accessory pigments that can absorb different wavelengths and transfer energy to the main photosynthetic pigments.

This results in a broader action spectrum compared to the absorption spectrum.

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Coastal engineering projects involve the design and construction of structures to manage and protect coastal areas from erosion, floods, and other natural hazards.

In a wave approaching perpendicular to a 500 m long breakwater, the height of the wave on the backside at a distance of 250 m from one of the ends can be estimated using wave transformation principles.

However, the height of the wave at a distance of 60 m from one of the edges along a 60-degree angle with the breakwater requires additional information, such as wave direction and wave transformation equations, to provide an accurate estimate.

For a wave in water that is 15 m deep with a period of 11 s and a height of 1.4 m, the water particle velocity and pressure at a point 0 m ahead of the wave crest and 2 m below the still water level can be calculated using wave theory equations. The horizontal and vertical displacement of the water particle orbit at this point can also be determined using the properties of wave motion and particle orbits.

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Answer:

When the net force on an object decreases, the object's acceleration decreases.

Explanation:

i know

Answer:

Kinetic Energy

Explanation:

Potential Energy is where something is building up energy to move.

Answer:

Kinetic Energy

Explanation:

Answer: When you have more than one battery in a circuit, you add the values of the individual batteries to get the overall voltage of the circuit.

Explanation:

Wien's law states that the peak wavelength will: if the surface temperature increases by a factor of 2, the peak wavelength will: decrease by a factor of 2.

According to this, the wavelength at which the radiation curve reaches its maximum decreases as temperature increases. Higher energy photons are associated with the shift to shorter wavelengths. In other words, the relationship between max (peak wavelength) and temperature is inverse.

According to Wien's Law, which bears the name of German physicist Wilhelm Wien, objects with varying temperatures emit spectra with varied peak wavelengths. Shorter wavelength radiation is emitted by hotter things, giving them their blue appearance.

Wien's constant is a physical constant that describes the correlation between the black body's thermodynamic temperature and wavelength. It is a result of the black body's temperature and wavelength, which decreases as temperature increases until the wavelength is at its shortest.

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Newton's second law and the Atwood machine are often used together in high school physics labs to study the relationship between force, mass, and acceleration.

Newton's second law states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass.

The Atwood machine is a simple device that consists of a pulley and two masses connected by a string. By varying the masses and measuring the resulting acceleration, students can experimentally verify Newton's second law.

In the lab, students typically set up the Atwood machine, measure the masses of the two objects, and attach them to opposite ends of the string. They then release the system and measure the time it takes for the masses to move a certain distance.

Using this data, they can calculate the acceleration of the system. By applying Newton's second law, which states that the net force is equal to the mass times the acceleration, students can analyze the relationship between the masses and the resulting acceleration.

This lab provides a hands-on approach for students to understand and apply Newton's second law, reinforcing the concept of force, mass, and acceleration. It also helps students develop skills in data collection, analysis, and drawing conclusions based on experimental evidence.

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It has nothing to do with the area of contact or the speed of the slide.

The contact area between the two surfaces has no effect on the force generated by friction. But if the surface area is too small, this relationship breaks down, and the coefficient of friction goes up because the object may dig into the surface.

The static coefficient of friction may be affected by time, normal force, contact size, contacting materials' nature, and the presence of intermediate lubricant layers, as Coulomb already demonstrated experimentally.

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Answer:

This energy, called the heat of fusion or heat of melting, is absorbed by the particles as potential energy as the solid changes to a liquid

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Explanation:

Changing states of matter occur when matter loses or absorbs energy. When a substance absorbs energy, the atoms and molecules move faster and that increases kinetic energy, which causes particles to push even farther, to a point that they change its form. This energy is usually considered heat or thermal energy.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Hope I helped!!!

GL :)

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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The charge stored in the capacitor when 140 V is applied to it is 23.8 mC.

To calculate the charge stored in a capacitor, you can use the formula Q = C * V, where Q is the charge, C is the capacitance, and V is the voltage applied.

Given:

Capacitance (C) = 170 µF = 170 * 10⁻⁶ F

Voltage (V) = 140 V

Plugging these values into the formula, we have:

Q = (170 * 10⁻⁶F * 140 V

Calculating the charge:

Q = 23.8 * 10⁻⁶C

Converting to milliCoulombs (mC):

Q = 23.8 mC

Therefore, the charge stored in the capacitor when 140 V is applied to it is 23.8 mC.

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Answer:

True

Explanation:

I did this on a test and got it right, I swear

Answer:

It can be concluded that the blue crystal is a hydrate. You can tell that it is a hydrate because when hydrates are heated, they give off water vapor proving that they had water chemically attached to their atoms.

Answer:

D.) Nuclear fusion begins under high pressure

Explanation:

Answer:

USE RUBBER CLOVES

USE A PLIER

USE CONDUCTIVE WIRES

SWITHC OFF THE MAIN SWITCH WHILE WIRRING

Explanation:

The magnitude and phase in frequency domain are given

Vx~ = 2.828 angle = -45 degrees

vx(t) = 2.83cos(2?(10^3)t - 45°) V

Using Kirchhoff's voltage law, we can write the equation:

i1R1 + i1R2 + L1(di1/dt) = Vx

Taking Laplace transform on both sides and solving for Vx, we get:

Vx~ = i1~(R1+R2+jωL1)

Substituting i1~ with its phasor value (6 mA ∠0°), R1=1200 Ω, R2=600 Ω, L1=30 mH and ω=2π(10^3) rad/s, we get:

Vx~ = 2.828 ∠-45° V

To get the time-domain expression, we take the inverse Laplace transform of Vx~, which results in:

vx(t) = 2.83cos(2?(10^3)t - 45°) V

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Answer:

1.968504 ft/s

Charge q1=1.00 nC is at x1 = 0 and charge q2 = 3.00 nC is at x2 = 2.00 m. At a point 1.00 m away from charge q1, the electric field will be equal to zero.

This can be determined by calculating the electric field at this point, which is given by:E = (1/4πεo) x (q1/x2 - q2/x2), where εo is the electric permittivity of free space and x is the distance from charge q1.
At x = 1.00 m, E = 0.

An electric field is defined as the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, which is either attracting or repelling them. It is also refers as the physical field for a system of charged particles.

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The speed v(c) of the center of mass of the system after the pod is launched is equal to v(f).

Mass of the pod, m₁ = m

Mass of the spaceship, m₂ = 6m

The conservation of momentum principle states that, within a given domain, the amount of momentum is constant such that, momentum is never created nor destroyed, but only modified by the application of forces.

So, according to the conservation of momentum, the momentum before launch and before launch must be equal. Therefore, the speed of the center of mass of the system becomes equal to the speed with which the spaceship is moving towards the right.

Therefore,

v(c) = v(f)

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Answer:

Hotter.

Explanation:

When heat is added to a substance, the molecules and atoms vibrate faster.

The magnitude of the magnetic field at the center of the loop 6.28  × 10⁻⁵ T.

A magnetic field is a vector subject that describes the magnetic effect on moving electric charges, electric currents, and magnetic materials. A transferring price in a magnetic area stories a pressure perpendicular to its very own pace and to the magnetic discipline.

calculation:-

Given;

Number of turns n  = 17 turns

radius = 11 cm = 0.11m

current i = 0.58 A

Magnetic field at the centre of the loop is

B = μ₀nI//2r

B = 4π × 10⁻⁷ × 17 × 0.58 / 2× 0.11

  = 628.4 × 10⁻⁷ T

   = 6.28  × 10⁻⁵ T

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric-powered currents, and magnetic substances. A transferring rate in a magnetic field story a pressure perpendicular to its own velocity and to the magnetic area.

The magnetic field is the place around a magnet wherein the impact of magnetism is felt. We use the magnetic discipline as a tool to explain how the magnetic force is shipped in the area around and inside something magnetic in nature.

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From the calculations, the total heat involved in the entire process is 9.72 × 10^6 J.

The term specific heat capacity is the heat that is gained when 1 Kg of a body undergoes a temperature rise of 1 K.

a) H = mcdT

m = mass

c = specific heat

dT = temperature change

H = 3.62 kg ×  2020J/kg°C × (157 - 100)

H = 416806.8 J

b) H = mL

H = 3.62 kg × 2,260,000 J/kg

H = 8181200 J

c) H = 3.62 kg × 4200 J/kg°C × ( 100 -26)

H = 1125096 J

Total heat: 416806.8 J + 8181200 J + 1125096 J = 9.72 × 10^6 J

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Answer: Ohm's law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and directly proportional to the resistance of the circuit. The formula for Ohm's law is V=IR.

The application allows the user to enter weekly temperature readings over a five-week period. Upon clicking the Calculate Average button, the application calculates and displays the average temperature in a Label control. It also includes error handling to display an appropriate message if non-numeric values are entered.

1. Design the form: Create a form with labels, textboxes for temperature input, a Calculate Average button, and a Label control to display the average temperature.

2. Implement event handling: Attach an event handler to the Calculate Average button's click event. In the event handler, perform the necessary calculations and display the average temperature in the Label control.

3. Validate input: Before calculating the average, validate the user input to ensure numeric values are entered. You can use functions like `Double.TryParse` or regular expressions to check if the input is numeric. If non-numeric values are detected, display an error message and prevent the calculation.

4. Calculate the average: If the input is valid, calculate the average temperature. Sum up the temperature readings entered for each week and divide by the total number of weeks (in this case, five).

5. Display the result: Set the text property of the Label control to the calculated average temperature. Format the result as desired, such as rounding to a specific decimal place.

6. Test the application: Run the application and enter sample temperature readings for each week. Verify that the average is correctly calculated and displayed.

By following these steps, you can create an application that allows users to enter weekly temperature readings, calculates the average, and displays it in a user-friendly manner.

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Explanation:

Given data

velocity v= 25m/s

The time it takes to put on brake t= 0.3s

the distance covered when the  brake was put on is

v=s/t

s= v*t

s= 25*0.3s

s= 7.5m

hence the distance covered is 7.5m

Also the rate of decrease in aceleration is 5m/s^2

we can also calculate the distance covered at this rate

v^2=u^2+2as

25^2= 0+2*5*s

625=10s

divide both sides by 10

s=625/10

s= 62.5m

The total  distance covered between putting on the brakes and decelareation is  7.5+62.5= 70m

Given that the tree is 75m ahead, the car would not hit the tree

a) The electric current flowing through it is 5 amp.

b) The voltage will produce by an amount of 60 volt.

A stream of charged particles, such as electrons or ions, travelling through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flowing through a surface or into a control volume is how it is calculated.

a) When  a 24 ohm heating coil in a coffee maker plugged into a 120v outlet, electric current flowing trough it = 120 v/24 ohm = 5 amp.

b) When  e 6 amps through a circuit that has 10 ohms of resistance, voltage produced in it = 6 amp × 10 ohm = 60 volt.

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The angular speed increases by a factor of 2 and when she decreases her moment of inertia by a factor of 2 her angular speed change.

Angular momentum is a characteristic of rotating bodies determined by the product of their angular velocity and moment of inertia.

The angular momentum is calculated by

L = IW

Where,

I = Inertia momentum

W = angular velocity

It can be calculated by applying the law of conservation of angular momentum as given below:

= \(I_{i} W_{i} =I_{f} W_{f}\)

Where, i = initial, f = final

Since the final inertia momentum of figure skater gets decreased by 1/2 from the initial,

= \(\frac{1}{2}I_{i} = I_{f}\)

Therefore, the final angular speed would become

 \(I_{i} W_{i} = \frac{1}{2} I_{i} W_{f}\)

 \(2W_{i} = W_{f}\)

Hence, which means that angular speed increases by a factor 2.

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Given that the progressive wave equation is represented by y=Asin2π(0.15t-0.1x). Let's find the period, amplitude, frequency, wavelength, and velocity.

The wave equation is represented by y=Asin2π(0.15t-0.1x). The standard wave equation can be written asy = Asin(kx-ωt + Φ)Where,k = wave numberω = angular frequencyΦ = phase angle for the given equation, k = 0.1 and ω = 0.15.Amplitude:

Amplitude = A = maximum displacement from the mean position.A = 1Frequency: Frequency is the number of complete oscillations made by a point on the wave in one second. It is denoted by f.f = ω/2πFrequency, f = 0.15/2π = 0.0238 HzPeriod: Period is the time taken by one complete oscillation.

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