A baseball has a momentum of 6.0 kg x m/s. If the mass of the baseball is 0.15 kg, what is the baseball's speed?

Time is typically measured in units such as seconds, minutes, hours, days, weeks, months, and years. Work, on the other hand, is typically measured in units such as joules, calories, foot-pounds, or Newton-meters.

Time is a measurement of the duration or interval between two events, and it is usually measured in seconds, minutes, hours, days, weeks, months, or years.

Work, on the other hand, is a measure of the energy expended to move an object over a certain distance or to apply a force to an object to cause it to move. Work is often measured in units of joules, but it can also be measured in units of work per unit time, such as watts.

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True, The sun is a relatively young star, near the beginning of its life. A star is a celestial object that creates light and heat.

They form from dense clouds of gas and dust in space known as nebulae. In general, stars are classified into three categories depending on their mass, composition, and luminosity.Stars in their early life stages are young and have not reached the later stages of their life yet.

They also have more energy and are hotter than stars that have reached later stages. The sun is a relatively young star, near the beginning of its life. It is classified as a G-type main-sequence star, which means it's a mid-sized star with a surface temperature of about 5,500 degrees Celsius.The sun, like all stars, formed from a cloud of gas and dust, and its energy comes from nuclear fusion reactions in its core. As it converts hydrogen into helium, it emits light and heat. It will continue to do so for billions of years to come.

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UV radiation can cause changes to the DNA sequence known as mutations.

UV radiation, specifically UVB and UVA rays, has the ability to penetrate the skin and interact with the DNA molecules within our cells. When UV radiation is absorbed by the DNA, it can lead to the formation of abnormal chemical bonds between adjacent nucleotides, resulting in structural changes to the DNA molecule.

One common type of mutation caused by UV radiation is the formation of pyrimidine dimers. UVB rays have sufficient energy to directly cause adjacent thymine or cytosine bases to form covalent bonds, creating abnormal dimers. These dimers can distort the DNA helix and interfere with normal DNA replication and transcription processes.

If not repaired by cellular mechanisms, these mutations can be passed on during cell division and potentially lead to genetic disorders or an increased risk of cancer development.

To mitigate the harmful effects of UV radiation, it is important to protect the skin from excessive sun exposure by using sunscreen, wearing protective clothing, and seeking shade during peak UV hours.

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Explanation:

Consumerism is a social and economic order that encourages the purchase of goods and services in ever-greater amounts. ... In economics, consumerism refers to economic policies placing emphasis on consumption.

Answer:

HOPEFULLY i am correct but i say its D. Hopefully I helped!✨

Answer: It can be A or B

Explanation: In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time.

Label the rows as the electron energy levels:

The rows of the periodic table are also known as periods. There are seven periods, and each period corresponds to a particular energy level. You can label them from 1 to 7, starting from the top row.

Label the number of valence electrons in Columns 1, 2, and 13-18:

Columns 1 and 2 are the s-block elements, and they have 1 and 2 valence electrons, respectively. Columns 13-18 are the p-block elements, and they have 3 to 8 valence electrons, respectively. You can label the number of valence electrons in each column.

Label the metals, semi-metals, and non-metals using different colors:

Metals are on the left side of the periodic table, semi-metals are in the middle, and non-metals are on the right side. You can use different colors to label them without obscuring any of the information about different elements.

Label the ion charges for elements in the first 3 rows:

Elements in the first 3 rows of the periodic table have predictable ion charges. The alkali metals (Group 1) have a charge of +1, the alkaline earth metals (Group 2) have a charge of +2, and the elements in Group 13 have a charge of +3. For Groups 15, 16, and 17, the charges are -3, -2, and -1, respectively. The noble gases (Group 18) are unreactive and do not form ions. You can write these charges for each element in their respective positions.

Label the trends for atomic size, ionization energy, and electron affinity:

Atomic size generally decreases from left to right across a period and increases from top to bottom within a group. Ionization energy generally increases from left to right across a period and increases from bottom to top within a group. Electron affinity generally increases from left to right across a period and becomes less negative from top to bottom within a group. You can label these trends on your periodic table as well.

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A property that can be observed without changing the identity of a substance is a Physical Property.

A physical property is a property that can be observed or measured without changing the composition of the substance. They are used to observe and describe matter. Texture, color, smell. Melting point, boiling point, density, solubility, polarity, electrical conductivity, ductility, ductility, luster, sound intensity, etc., are some examples of physical properties.

Physical properties are often characterized as strength and general properties. Intensive properties do not depend on the size or extent of the system, nor on the amount of matter in the object, while extensive properties exhibit an additive relationship. These classifications are generally valid only if the smaller subdivisions of the sample do not interact in a physical or chemical process when combined.

Goods can also be classified according to the meaning of their nature. For example, isotropic properties do not vary with viewing direction, while anisotropic properties have spatial variance.

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Specific heat is quantity of heat required to increase the temperature of a substance by one degree celsius.

The formula to calculate heat energy is

Q=mc∆T

We know, Q=mc∆T

Where Q = heat energy

m = mass

c= specific heat capacity

∆T= change in temperature

Thus,

According to above formula

c= Q/m∆T

Here m= 2 kg

∆T= 5 degrees

Q= 2000 joules

c= 2000/2×5

c= 200

Thus, the specific heat capacity of the block is 200.

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The mass of the asteroid would have to be approximately 1.67 x 10^22 kg, or about 2.8% of the mass of the Earth, for the day to become 25% longer.

When the asteroid collides with the Earth at the equator and buries itself just below the surface, it will transfer some of its angular momentum to the planet.

This will cause the Earth to rotate more slowly, resulting in a longer day. To calculate the required mass of the asteroid, we need to use the principle of conservation of angular momentum.

Assuming that the Earth is a uniform sphere and that the asteroid is very small compared to the Earth, the initial angular momentum of the Earth is given by:

L = Iω = (2/5)MR²ω

where I is the moment of inertia of the Earth, ω is the initial angular velocity of the Earth, M is the mass of the Earth, and R is the radius of the Earth.

After the collision, the angular momentum of the Earth will be:

L' = (2/5)MR²(ω/1.25)

where ω/1.25 is the final angular velocity of the Earth, assuming that the day becomes 25% longer.

The change in angular momentum of the Earth is therefore:

ΔL = L' - L = (2/5)MR²(ω/1.25) - (2/5)MR²ω = (2/25)MR²ω

The asteroid must therefore have an angular momentum of:

L_asteroid = -ΔL = -(2/25)MR²ω

Assuming that the asteroid is traveling straight toward the center of the Earth, its angular momentum is given by:

L_asteroid = mvR

where m is the mass of the asteroid, v is its velocity, and R is the radius of the Earth.

Equating these two expressions for the angular momentum of the asteroid, we get:

mvR = -(2/25)MR²ω

Solving for m, we get:

m = -(2/25)(Rω/v)M

Substituting the value for the initial angular velocity of the Earth (ω = 7.292 x 10^-5 rad/s), the radius of the Earth (R = 6.371 x 10^6 m), and the velocity of the asteroid (v = escape velocity = 11.2 km/s), we get:

m = 1.67 x 10^22 kg

Therefore, the mass of the asteroid would have to be approximately 1.67 x 10^22 kg, or about 2.8% of the mass of the Earth, for the day to become 25% longer.

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"Microwave transmission systems are used for high volume, long distance, line-of-sight communications."

Microwave is a line-of-sight wireless communication technology that uses high frequency beams of radio waves to provide high speed wireless connections that can send and receive voice, video, and data information.

Due to their small wavelength and ability to be focused into narrow beams that may be targeted directly at the receiving antenna, microwave links are frequently employed for point-to-point communications. As opposed to lower frequency radio waves, which interfere with one other, this enables neighbouring microwave equipment to operate on the same frequencies.

Another benefit is that the microwave band has a very high information-carrying capacity due to its high frequency; its bandwidth is 30 times greater than that of the radio spectrum below it.

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Answer:

mgi

Explanation:

Answer: x = 7

Explanation: 12 = 14 -2 = 12.

It takes approximately 62438 years for the activity of plutonium waste to decrease from 120000 to 625.The quantity of radioactive atoms in a substance directly relates to its activity.

The period of time it takes for a radioactive substance's radioactive atom count to reduce by half is known as its half-life. The decay constant can be determined by using the half-life of plutonium

N(t) = N0 * e^(-λt)

where N(t) is the number of radioactive atoms at time t, N0 is the initial number of radioactive atoms, λ is the decay constant, and t is time.

The half-life of a radioactive substance is the time it takes for the number of radioactive atoms to decrease by half. We can use the half-life of plutonium to find the decay constant:

\(t1/2 = ln(2) / \alpha \\\alpha = ln(2) / t1/2\\\alpha = ln(2) / 24000 years\\\alpha= 2.89 * 10^-^5 year^-^1\)

Now we can use the activity formula to find the time it takes for the activity of plutonium waste to decrease from 120000 to 625:

\(N(t) = N_{0} * e^(^-^\alpha^t)\)

We know that A0 = 120000 and A(t) = 625, so we can solve for t:

\(625 = 120000 * e^(^-^2^.^8^9* 10^-^5 year^-^1 * t)\\t = -ln(625 / 120000) / (2.89 × 10^-^5 year^-^1)\\t = 62438 years\)

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Potential difference (in V) across the R₂ resistor is option E) 10

In the circuit given below, the capacitors are uncharged. The switch is then closed for a long time. R₁ = 6Ω, R₂ = 40 Ω, R3 = 40 Ω and V = 20V.

Find the potential difference across the R₂ resistor.Circuit Diagram:We can solve this question by following the below steps:

Step 1: Finding the Total Resistance

Let us assume the capacitors to be open circuit initially and solve the resistors R₁, R₂, and R₃ in series,

Rₛ.Rₛ= R₁ + R₂ + R₃= 6 + 40 + 40= 86Ω

Step 2: Calculating the Current

We can calculate the current flowing in the circuit by using Ohm's law, which is given as:

I = V/Rₛ = 20/86= 0.23A

Step 3: Finding the Potential Difference across R₂The potential difference across R₂ is given as:

V₂= IR₂= 0.23 × 40= 9.2V

Therefore, the potential difference (in V) across the R₂ resistor is 9.2V.

The option that matches the value is E. 10.

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Answer:

0.35

Explanation:

ur dogwater

Answer:

Hope this helps u pls mark me brainlist

Explanation:

The gas giants have atmospheres that are mostly hydrogen and helium. All four planets rotate relatively rapidly – while Earth spins once on its axis every 24 hours, Saturn spins once every 10 hours. Like Earth, all the gas giants have wind bands. These are seen as east-west stripes.

Answer:

Explanation:

5 C = 278 K

25 C = 298 K

V1 / T1 = V2 / T2

1.5L / 278 K = V2 / 298 K

V2 = (1.5L * 298) / 278

V2 = 1.61 L

Answer:

Well AM/Fm is digitally using soundwaves for cars through signal, which we cant hear without one (radio). Concerts are in real life and use wavelegnths that we hear because it bounces off overytihing.

Explanation:

The wind turbine with a blade diameter of 25 m and an average wind velocity of 6 m/s has an average electric power output of 172.34 kW. For an annual operating time of 8000 hours, the turbine will produce approximately 1,378,720 kWh of electricity.

If sold at a price of $0.09/kWh, the revenue generated from the electricity produced by the turbine would be approximately $124,086.72. To calculate the average electric power output, we can use the formula:

\(\[P = \frac{1}{2} \times \text{{density of air}} \times A \times v^3 \times \text{{efficiency}}\]\)

Substituting the given values into the formula, we can calculate the average electric power output:

\(\[P = \frac{1}{2} \times 1.3 \, \text{{kg/m}}^3 \times \left(\frac{\pi}{4} \times (25 \, \text{{m}})^2\right) \times (6 \, \text{{m/s}})^3 \times 0.34 \approx 172340 \, \text{{watts}} \approx 172.34 \, \text{{kW}}\]\)

To determine the amount of electricity produced for an annual operating time of 8000 hours, we multiply the average electric power output by the operating time:

\(\[\text{{Electricity produced}} = P \times \text{{operating time}} = 172.34 \, \text{{kW}} \times 8000 \, \text{{h}} = 1,378,720 \, \text{{kWh}}\]\)

Finally, to calculate the revenue generated, we multiply the electricity produced by the selling price per kilowatt-hour:

\(\[\text{{Revenue}} = \text{{Electricity produced}} \times \text{{price per kWh}} = 1,378,720 \, \text{{kWh}} \times \$0.09/\text{{kWh}} \approx \$124,086.72\]\)

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Explanation:

Momentum conservation

V=3.38

Delta kinetic energy =1/2m(vi^2-v^2)

Answer:

\(a=0.1\ m/s^2\)

Explanation:

Given that,

Initial velocity, u = 0

Final velocity, v = 2 m/s

Time, t = 20 s

We need to find the acceleration of the swimmer. The acceleration of an object is equal to the change in velocity per unit time. It can be given by :

\(a=\dfrac{v-u}{t}\\\\a=\dfrac{2\ m/s}{20\ s}\\\\a=0.1\ m/s^2\)

So, her average acceleration of the swimmer is \(0.1\ m/s^2\).

Answer:

I believe it is actually C

Explanation:

Matter and energy cannot be created or destroyed so A is incorrect

Since energy cannot be created, B is incorrect

while C and D both sound correct, D does not mention entering while C does so I believe C is correct. When i submit this answer into my quiz, i will add if i am right.

In the universe, all energy and matter are contained; no energy or matter enters or exits - the statement best describes why the universe could be considered an isolated system.

A thermodynamic system is said to be isolated if it cannot exchange either mass or energy with the outside world. In contrast to a closed system, energy can't move across isolated systems. Energy can move freely within and outside of closed systems; they are only closed to matter.

As both energy and matter can not exit from a universe, we can consider universe as a isolated system.

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Inform him that he should be more cautious because his work environment could have resulted in an accident. Inform him that you have cleaned up and that he owes you a favour.

The setting, social features, and physical conditions in which you perform your job are referred to as your work environment. These factors can have an impact on employee happiness, workplace relationships, collaboration, efficiency, and health.

A workplace culture is the set of shared values, belief systems, attitudes, and assumptions that employees share. Individual upbringing, as well as social and cultural context, influence this.

Taking care of the workplace environment boosts productivity, aids in talent retention, and, most importantly, is beneficial to the company's overall mental health. No job is perfect, not even those with an amazing office, a high salary, or entirely vocational tasks.

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Explanation:

the SI unit of force is newton(N)

but i am not really sure of acceleration

The

length

of the gap (t) between the steel rails is approximately 0.000288 meters or 0.288 millimeters.

To find the length of the gap, we need to consider the expansion or contraction of the steel rails due to the change in

temperature

.

Given:

Air temperature = -2 °C

Standard rail length = 12 m

We can use the linear

expansion

formula to calculate the change in length of the steel rails:

ΔL = α * L * ΔT

where:

ΔL is the change in length

α is the coefficient of linear expansion

L is the initial length

ΔT is the change in temperature

The

coefficient

of linear expansion for steel is typically around 12 x 10^(-6) per degree Celsius.

Now, we need to find the change in temperature (ΔT) from the reference temperature (which is not given in the question). Let's assume the reference temperature is 0 °C.

ΔT = (air temperature - reference temperature)

ΔT = (-2 °C - 0 °C)

ΔT = -2 °C

Substituting the values into the linear expansion formula:

ΔL = α * L * ΔT

ΔL = (12 x 10^(-6) / °C) * (12 m) * (-2 °C)

Simplifying the calculation:

ΔL = -0.000288 m

The negative sign indicates that the steel rails have contracted due to the decrease in temperature.

Therefore, the length of the

gap

(t) between the steel rails is approximately 0.000288 meters or 0.288 millimeters.

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length

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Answer:



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Home / AC Circuits / Power in AC Circuits



Power in AC Circuits

Electrical power consumed by a resistance in an AC circuit is different to the power consumed by a reactance as reactances do not dissipate energy

  

In a DC circuit, the power consumed is simply the product of the DC voltage times the DC current, given in watts. However, for AC circuits with reactive components we have to calculate the consumed power differently.

Electrical power is the “rate” at which energy is being consumed in a circuit and as such all electrical and electronic components and devices have a limit to the amount of electrical power that they can safely handle. For example, a 1/4 watt resistor or a 20 watt amplifier.

Electrical power can be time-varying either as a DC quantity or as an AC quantity. The amount of power in a circuit at any instant of time is called the instantaneous power and is given by the well-known relationship of power equals volts times amps (P = V*I). So one watt (which is the rate of expending energy at one joule per second) will be equal to the volt-ampere product of one volt times one ampere.

Then the power absorbed or supplied by a circuit element is the product of the voltage, V across the element, and the current, I flowing through it. So if we had a DC circuit with a resistance of “R” ohms, the power dissipated by the resistor in watts is given by any of the following generalised formulas:

Answer:

One that we describe using our 5 senses

Explanation:

A physical property describes something we can physically observe.

\(F=k(l_1-l_2)\)

\(10=5k\)

\(k=2\)

\(15=2*(30-l_2)\)

\(15=60-2l_2\)

\(2l_2=45\)

\(l_2=22,5cm\)

A force of 3 N is applied to a spring. The spring is not stretched beyond the limit of proportionality and it stretches by 15 cm. The spring constant is 20 N/m.

Spring constant (k) can be calculated using the formula;

k = F/x

Given that the force applied is 3N and the extension is 15 cm (which is equal to 0.15 m).

Substitute these values in the above formula;

k = F/x = 3/0.15 = 20 N/m

Therefore, the spring constant is 20 N/m.

When an external force is applied to a spring, it undergoes deformation. Hooke's law states that the deformation of a spring is directly proportional to the force applied provided that the limit of proportionality is not exceeded.

The spring constant k represents the amount of force required to produce a unit deformation in the spring. The higher the spring constant, the stiffer the spring is.

The formula for the spring constant is given as;

k = F/x

where F is the force applied to the spring and x is the deformation produced in the spring.

In this case, a force of 3N is applied to the spring, causing an extension of 15 cm. By substituting these values in the above formula, we get the spring constant as 20 N/m.

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