help solve these questions for me please im badd at this!

Answer:

approximately 0.00504 kWh

Explanation:

This electrical energy and is measured in kWh.

For 5 minutes and 20 seconds of use, it is 0.06 W x 0.084 h = 0.00504 kWh.

Note: 60W = 0.06kW; 5min 20sec = 0.083(8) ≈ 0.084 hour

Answer:

Sport lowers high blood pressure, Keeps cholesterol level right. Blood circulation in the body is relatively high during play, so nutrients can go to all parts of the body. Moreover, white blood cells increase during play that increases the body’s immunity power. That’s why sports is important in our life.

Explanation:

yes

You will hear two taps when your friend taps the fence​ because the sound wave created by tap travels through the fence and into the air. When the sound wave reaches your ear, then you will hear the first tap.

When your friend taps the fence, you will hear two taps because the sound wave created by the tap travels through fence and into the air. When sound wave reaches your ear, you will hear the first tap.

The sound wave then continues to travel through fence and reflects back towards your ear, creating second tap. This is known as echo. The time between the two taps depends on distance the sound wave has to travel, density of the fence material, and other factors that can affect speed and reflection of the sound wave.

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The speed of the wind is 17 mph and the speed of the plane in still air is 119 mph.

Let the speed of the plane be x and the speed of the wind be y. Then, the speed of the plane with the wind becomes x + y, while the speed of the plane against the wind is x - y.

The distance traveled with the wind in 3 hours is 408 miles.

Therefore, we can write the equation as:

3(x + y) = 408

Divide both sides by 3:

x + y = 136  .... (1)

The distance traveled against the wind in 4 hours is also 408 miles.

Therefore, the equation can be written as:

4(x - y) = 408

Divide both sides by 4:

x - y = 102  .... (2)

Now we can solve these two equations using the elimination method.

Add equations (1) and (2):

x + y + x - y = 136 + 1022x = 238x = 119 mph

Therefore, the speed of the plane in still air is 119 mph.

Now, substitute this value of x in equation (1):

119 + y = 136y = 17 mph

Therefore, the speed of the wind is 17 mph.

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The correct question is:

A plane flies 408 mi with the wind in 3 hr. The return trip takes 4 hr. What is the speed of the wind and the speed of the plane in still air?

The additional energy density required to get the water's temperature up to 55 degrees is 4,500 cal.

1 g of water requires 100 calories to heat from its freezing point of 0 C to its boiling temperature of 100 C. However, in order to turn 1 g of water at 100 °C into 1 g of water vapour at 100 °C, 540 calories of energy are needed. The latent heat of vaporisation is what is causing this.

Water has an energy density of 1 calorie/gram/°C. As a result, the amount of energy needed to raise 150 grammes of water's temperature by 30 degrees Celsius (from 25 to 55 degrees Celsius) can be estimated as follows:

Energy = (mass of water) x (change in temperature) x (specific heat capacity of water)

Energy = 150 g x 30°C x 1 cal/g/°C

Energy = 4,500 calories

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The angular speed of the object is 1/30 radian per second, and the linear speed is approximately 0.1053 inches per second.

Angular speed refers to the rate at which an object rotates around a circle, measured in radians per second. In this case, the object sweeps out a central angle of 1/3 radian in 10 seconds, so the angular speed is calculated by dividing the angle by the time. Linear speed, on the other hand, is the distance traveled per unit of time along the circumference of the circle. It can be found using the formula: linear speed = angular speed × radius. Given the radius of 5 inches, the linear speed is obtained by multiplying the angular speed by the radius.

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Answer:

Anaphase

Explanation:

This is because the spindle fibres have shortened and is pulling the chromatids towards the poles of the cell. The chromatids have also separated.

The cell division which is shown in the picture is anaphase. The correct option is C.

Meiosis is divided into two main phases, each with its own set of subphases:

1 Meiosis I:

a. Prophase I: This is the longest and most complex phase of meiosis. During this phase, homologous chromosomes pair up and form bivalents, and crossing over occurs between the homologous chromosomes. The nuclear envelope breaks down, and spindle fibers form from the centrioles at opposite poles of the cell.

b. Metaphase I: During this phase, the homologous chromosomes line up along the metaphase plate, with one chromosome from each homologous pair facing each pole of the cell.

c. Anaphase I: During this phase, the spindle fibers contract and pull the homologous chromosomes towards opposite poles of the cell.

d. Telophase I: During this phase, the chromosomes reach the poles of the cell and the nuclear envelope reforms around each set of chromosomes. The cell then undergoes cytokinesis, resulting in two daughter cells.

2. Meiosis II:

a. Prophase II: During this phase, the nuclear envelope breaks down, and spindle fibers form from the centrioles at opposite poles of the cell.

b. Metaphase II: During this phase, the chromosomes line up along the metaphase plate, with sister chromatids facing opposite poles of the cell.

c. Anaphase II: During this phase, the spindle fibers contract and pull the sister chromatids towards opposite poles of the cell.

d. Telophase II: During this phase, the chromosomes reach the poles of the cell and the nuclear envelope reforms around each set of chromosomes. The cell then undergoes cytokinesis, resulting in four haploid daughter cells.

Meiosis involves two rounds of chromosome segregation, resulting in four haploid daughter cells that are genetically distinct from the parent cell.

Therefore, The correct option is C i.e anaphase.

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Answer:

see below

Explanation:

Reultant force via Pythag Theorem

R = sqrt (3^2 + 4^2) = 5 N

F = ma

5 = 20 a

a = 5/20  m/s^2

Answer:

Explanation:

Power (p)= 40 watt

time (t)= 3 minutes = 180 seconds

Energy (E)= ?

we know

P = E/t

40 = E / 180

E = 7200 Joules

Therefore it does 7200 joules of work.

hope it helps :)

Answer:

YES SURE

Explanation:

Answer:

#6 is 14 miles in 7 mins

Explanation:

you need to get the unit rate (how many miles per min) then multiply from there so you take 10/5 (because there 5 mins) and get 2 miles per min, then you take 2 an multiply it by 7 (because you want to know how far she went in 7 min) and you get 14

Answer:: 14miles in 7 mins

Answer:

Jo

Explanation:

irradiating food doesn't make it radioactive (that's contamination) and beta particles are stopped by aluminium foil or thin metals, so it may not pass through thick packaging (usually gamma is used to irradiate foods as it can pass through the packaging)

Answer:

Protostar

Explanation:

Answer:

0.433 s

Explanation:

Let's break the projectile motion into its horizontal and vertical components:

Horizontal component (x):

Vertical component (y):

We want to find the time required for the hurdler to travel a distance of 0.635 m. In order words, his displacement should be 0.635 m in the x-direction.

Since we don't have the final velocity, we can use this constant acceleration equation:

We have three known variables and want to solve for t. Using this equation in the x-direction, we have:

Substitute these values into the equation.

Simplify the equation.

Divide both sides by the horizontal component of the initial velocity.

Since we start with 3 sig figs, we will round this value to 0.433. The time it takes to clear the hurdle is 0.433 seconds.

The molecular formula of a substance containing carbon, hydrogen, and oxygen and molar mass 234 is C10H12O5.

For solving the molecular formula of a substance containing carbon, hydrogen, and oxygen, we first need to find out the empirical formula. The empirical formula is the simplest whole-number ratio of atoms of each element present in a compound.The steps involved in finding the empirical formula of a substance are as follows:

1. Find the mass of each element present in the compound.

2. Convert the mass of each element into moles using its atomic mass.

3. Find the ratio of the moles of each element.

4. If the ratio obtained in step 3 is not a whole number, divide the ratio by the smallest ratio obtained.

5. Multiply the resulting numbers obtained in step 4 to make them whole numbers.

6. Write the empirical formula using the whole numbers obtained in step 5.The empirical formula mass (EFM) of the compound is the sum of the atomic masses of all the atoms in the empirical formula.

The molecular formula is the multiple of the empirical formula that gives the actual molecular mass.The molar mass of the compound is given to be 234 g/mol. We can use this value to find the molecular formula.Let's assume that the compound has 100 g of mass. The composition of the compound in grams is given as follows:Carbon (C) = x grams; Hydrogen (H) = y grams; Oxygen (O) = z grams. The sum of these masses is equal to 100 g:x + y + z = 100 gThe molar masses of the elements are as follows:Carbon (C) = 12.01 g/mol; Hydrogen (H) = 1.008 g/mol; Oxygen (O) = 16.00 g/molThe moles of each element can be found using their masses and molar masses as follows:nC = x / 12.01 molnH = y / 1.008 molnO = z / 16.00 mol. The ratio of the moles of these elements can be found by dividing them by the smallest number of moles found:nC / nH / nO = x / 12.01 / y / 1.008 / z / 16.00. Let's assume that this ratio is 1:2:1nC / nH / nO = 1 / 2 / 1The empirical formula for this compound is C2H4O2. The EFM for this formula is 44.05 g/mol.The molecular formula can be found by dividing the molar mass of the compound by the EFM:MF = molar mass / EFMMF = 234 g/mol / 44.05 g/molMF = 5.31

Since this value is not a whole number, we need to round it to the nearest whole number to get the molecular formula. Therefore, the molecular formula for this compound is C10H12O5.

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Answer:

Accelaration: 2 - 1.875 - 2.167 - 2.25

Explanation:

Acceleration is \(\frac{ Ending Velocity-Starting Velocity }{Ending time-Starting time}\)

Acceleration to Time graph and the conclusion would be the description of that slope

Answer:

Answer is letter B

Answer:  THE CORRECT ANSWER IS :  The partiles that make up material B are more closely packed together than the partiles that make up material A

Explanation:     I TOOK THE TEST    apex

The required velocity of mass 100 kg is 3.75 m/s.

The required velocity of mass 100 kg is determined by applying the principle of conservation of linear momentum as follows;

This principle states that in an isolated or closed system, the sum of the initial momentum of an object is equal to the sum of the final momentum.

momentum of the 100 kg mass = momentum of 150 kg mass

100 kg x v = 150 kg x 2.5 m/s

v = ( 375 kg m/s ) / ( 100 kg )

v = 3.75 m/s

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The complete question is below:

A mass of 150 kg is moving 2.5 m/s. How fast would an object with a mass of 100kg need to be going to hit the previous mass head on and come to a complete stop?​

The independent variable is the different amount of repellent each person is given. This is because it does not depend on any variable. The dependent variable is what they are measuring, which would be the number of bites on each volunteer.
I hope this helps! :)

Answer:

160J OR 140J

Explanation:

Depends on teacher which formula your teacher uses.

U=Q+W OR U=Q-W

Method 1:

U=150+10J=160

U=150-10=140J

Thermal energy is transferred between objects only when they have different temperatures.

The movement of atoms and molecules within a substance is a form of energy known as thermal energy.

When two objects are in contact, or even in proximity, the atoms and molecules in the hotter object collide with those in the colder object.

Because of these effects, a portion of the kinetic energy from the more sizzling object is moved to the colder object, raising the temperature of the previous and bringing down the temperature of the last option.

A material's thermal conductivity — an estimation of how well it moves heat — decides how rapidly heat is moved between various sorts of materials.

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Claim: Humans have significantly impacted the ecological balance of our planet.

Evidence:

1. Human-induced climate change: The increase in greenhouse gas emissions from human activities, such as burning fossil fuels and deforestation, has led to global warming.

This phenomenon has caused shifts in climate patterns, including more frequent and severe extreme weather events like hurricanes, heatwaves, and droughts. The Intergovernmental Panel on Climate Change (IPCC) and other scientific studies provide extensive evidence supporting the link between human activities and climate change.

2. Biodiversity loss: Human activities, such as habitat destruction, overexploitation of resources, pollution, and introduction of invasive species, have resulted in a significant loss of biodiversity. According to the International Union for Conservation of Nature (IUCN), the current rate of species extinction is estimated to be 1,000 times higher than the natural background rate.

3. Altered nutrient cycles: Human activities, particularly intensive agriculture and excessive use of fertilizers, have disrupted nutrient cycles such as the nitrogen cycle. Excess nitrogen in ecosystems can lead to nutrient imbalances, eutrophication of water bodies, and harmful algal blooms, negatively impacting aquatic ecosystems.

Reasoning:

1. The evidence of human-induced climate change is supported by the principle of energy flow and the greenhouse effect. Increased greenhouse gas emissions trap more heat in the atmosphere, altering the balance of energy flow and leading to global warming.

2. Biodiversity loss is linked to the ecological principle of interdependence. Species play crucial roles in ecosystem functioning, and the loss of one species can have cascading effects on others, disrupting ecological interactions and overall ecosystem stability.

3. Altered nutrient cycles relate to the principle of nutrient cycling. Excessive inputs of nitrogen disrupt the natural cycling processes, impacting the availability of nutrients for organisms and leading to ecological imbalances.

Conclusion:

To address the problems we have caused, several actions can be taken. Firstly, transitioning to renewable energy sources and reducing greenhouse gas emissions is crucial to mitigate climate change.

Conserving and restoring habitats, implementing sustainable resource management practices, and controlling the spread of invasive species are essential for preserving biodiversity.

Additionally, adopting sustainable agricultural practices, reducing fertilizer use, and implementing effective waste management systems can help restore nutrient cycles and reduce pollution.

Promoting environmental education and awareness, supporting conservation efforts, and engaging in responsible consumption and lifestyle choices are also vital for long-term ecological balance.

Overall, a comprehensive and collaborative approach is necessary to fix the problems we have initiated and ensure a sustainable future.

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Answer:

So if we need to cover 1000 meters. And we go at a speed of 4.3 m/s. That means that every 4.3 meters we cover is 1 second. So we divide both amd get

1000/4.3 = 232.56 is approx the answer. Also the meters cancel out because

m/(m/s) = m*s/m, cancels out giving s as a unit.

Answer:

\(F_c = \frac{KQ_1Q_2}{R^2}\)

Explanation:

Coulomb’s law is given as;

\(F_c = \frac{KQ_1Q_2}{R^2}\)

where;

F is the electric force between q₁ and q₂

k is the coulomb’s constant  = 9 x 10⁹ Nm²/C²

r is the distance between the two charges

q₁ and q₂ are the two charges

Therefore, the coulomb’s law is given as \(F_c = \frac{KQ_1Q_2}{R^2}\)

The temperature of the electronic circuit increases at a rate of 3.84 × 10^11 K/s if no heat moves out of the electronic circuit.

When designing an electronic circuit that is made up of 170 mg of silicon, the electric current adds energy at a rate of 8 MW. Silicon's specific heat is 705 J/kg K.

The question demands to know the rate of temperature increase if no heat can move out of the electronic circuit formula used to calculate the temperature rise of silicon isΔT= (Q / m) × (1/Cp)where

ΔT = change in temperature,

Q = heat input,

m = mass, and

Cp = specific heat capacity of silicon

Given values are mass (m) = 170 mg,

Q = 8 MW, and

Cp = 705 J/kg K.

Converting 170 mg to kg:170 mg

= 170 × 10^-6 kg = 1.7 × 10^-4 kg

Therefore,Q = 8 MW = 8 × 10^6 J/s

The formula becomesΔT = (8 × 10^6 / 1.7 × 10^-4) × (1/705)

ΔT = 3.84 × 10^11 K/s

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Stars like the Sun primarily transport newly formed elements into the interstellar medium through a process called stellar winds and, in more massive stars, through supernova explosions.

Stars are known to  undergo nuclear fusion in their cores, where they convert lighter elements into heavier ones. This fusion process releases energy and creates new elements, such as helium, carbon, oxygen, and so on. Over millions or billions of years, these newly formed elements accumulate in the stellar interiors.

In the case of stars like the Sun, which are of moderate mass, they eventually enter the later stages of their lives known as the red giant phase.

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Answer:D is the answer

Explanation:yes

The mean free path in the gas is given by the formula: mean free path = (k * T) / (sqrt(2) * pi * d^2 * P), where k is Boltzmann's constant, T is the temperature in Kelvin, d is the diameter of a helium atom.

P is the pressure in atm. The diameter of a helium atom is approximately 2.4 Ångstroms.

The rms speed of the atoms is given by the formula: rms speed = sqrt((3 * k * T) / (m)), where k is Boltzmann's constant, T is the temperature in Kelvin, and m is the mass of a helium atom.

The average energy per atom is given by the formula: average energy per atom = (3/2) * k * T, where k is Boltzmann's constant and T is the temperature in Kelvin.

The mean free path is the average distance an atom travels between collisions. It depends on the temperature, pressure, and size of the atoms.

The rms speed is the square root of the average of the squared speeds of the atoms. It gives an indication of the magnitude of the velocities of the atoms.

The average energy per atom is the average kinetic energy of the atoms in the gas. It depends only on the temperature and is proportional to the absolute temperature.

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