How would you find the speed of a person who walked
10 meters in 8 seconds? Circle the letter of the correct
answer.
a. Speed = 10 meters = 8 seconds
b. Speed - 8 seconds x 10 meters
c. Speed - 8 seconds 10 meters

Answer:

E = 15680 J

Explanation:

We have,

Mass of Danielle is 80 kg

He is at the top of hill at a height of 20 m

As she slides down at the bottom of the hill, its potential energy gets converted to its kinetic energy. So, the kinetic energy at the bottom of the hill is :

[tex]E=mgh\\\\E=80\times 9.8\times 20\\\\E=15680\ J[/tex]

So, she will have 15680 J of kinetic energy at the bottom of the hill.  

Answer: it is period 93

Explanation:

The period of a wave, measured in seconds, is the reciprocal of its frequency. Given that a piano note vibrates at a frequency of 262 times per second, the period of the wave is approximately 1/262 or 0.00381 seconds.

In physics, the frequency is the number of waves that pass a fixed point in a given time period. We typically measure it in hertz (Hz), which is synonymous with cycles per second. On the other hand, the period is the duration it takes for one cycle to pass, which is the reciprocal of the frequency.

Here the note on the piano is stated to vibrate (frequency) 262 times per second. Thus, to calculate the period, we take the reciprocal of the frequency i.e. 1 divided by the frequency. Hence, it's 1/262 which equals approximately 0.00381 seconds. So, the period is about 0.00381 seconds.

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Cauterizing an incision or wound is associated with light, but not sound.

This is a medical procedure which involves burning a part of a body to remove or close off a part of it.

It is usually done with the use of hot iron, electricity etc which makes it associated with light and not sound.

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According to Ohm's law, if the voltage across a resistor is decreased, the current flowing through it will decrease proportionally. This is because the current is directly proportional to the voltage while the resistance remains constant.

The change in current flowing through a resistor, when the voltage across the resistor is decreased, can be explained using Ohm's law. According to Ohm's law, the voltage (V) across a resistor is equal to the product of the current (I) that passes through it and its resistance (R). The relationship is given by the formula V = IR.

If the voltage across the resistor is decreased, it would result in a decrease in the current through the resistor. For instance, if the voltage is decreased by 4 units, the current will drop by a factor that is equal to '4 divided by the resistance (R).' This is because current is directly proportional to voltage, maintaining a constant resistance.

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Answer:

hope this helps

...........

Friend #1 gets at least 2/5 of a pizza.

Friend #2 gets at least 2/5 .

Friend #3 gets at least 2/5 .

Friend #4 gets at least 2/5 .

Friend #5 gets at least 2/5 .

Friend #6 gets at least 2/5 .

Sum . . . . . . . . . at least  12/5 of a pizza.

Simplify . . . . . . at least  2.4 pizzas.

-- If pizzas can be bought by the half, they should order at least 2-1/2 pizzas.

-- If only whole pizzas have to be ordered, then they should order at least 3 pizzas.

Answer:

3 pizza if your in khan! :D

Explanation:

kenetic and potential

Answer:

1/ How do scientists determine the elements present in different stars?

KEY WORD for the main idea: Analysis of the starlight.

Answer: Scientists can identify what elements present in different stars by analysing the starlight.

Note: The "starlight" = spectral lines. Astronomers can can identify what kinds of stuff are in stars from the lines they find in star's spectrum. From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.

..

2/ What happens to a star when the fuel for its nuclear fusion reactions is exhausted?

KEY WORD for the main idea: generate light from energy

Answer: A star generates energy through nuclear fusion; this energy is released a light and heat.

Note: The energy source for all stars is nuclear fusion. Stars spend most of their lives repetitively compressing two hydrogen atoms into a single helium atom - plus a lot of energy, which is released as light and heat. A normal star that has exhausted the nuclear fuel in its interior, its outer layers have expanded, and it has become a red giant.

....

3/ Why aren't stars and galaxies spread out evenly across the universe?

KEY WORD for the main idea: Gravitational attraction

Answer: Stars and Galaxies aren't evenly distributed uniformly throughout the universe, because of the existance of gravity.

Note: Gravity, as one of the fundamental forces of the universe, is the powerful force that glues our universe together. This is the one that causes every object in the universe to attract every other object. One of the most noticeable effects of gravity in the solar system is the orbit of the planets.

Explanation:

Hope this answer can help you. Have a nice day !

Answer:

Genetic Engineering: the direct manipulation of an organisms genes using biotechnology (ex. genetically engineering corn to be insect resistant)

Cloning: The process of producing genetically identical individuals of an organism either natually or artificially,cloning allows for the creation of multiple copies of genes, expression of genes, and study of specific genes (ex. Cloning cells for untreatable diseases)

Artificial Selection: Also known as Selective breeding it is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits/ characteristics (ex. Dog breeding)

Answer:

Genetic Engineering :

Benefits

-Ability to create food that is resistant to pests, cold, and disease

-Greater food production volume and increased vitamins

Risks

-Concerns about long-term health risks

-Lack of regulation

Cloning

Benefits

-Ability to increase endangered animal populations

-Possibility of eliminating diseases and defective genes

Risks

-Shorter lifespan for cloned animals

-Greater chance of health issues for cloned animals

Artificial Selection

Benefits

-Allows for selection of desired traits

-Ability to create better versions of organisms

Risks

-Loss of genetic diversity

-Increased chance of diseases that can shorten lifespan

Explanation:

This is straight from the lesson 6.01 page 5 (FLVS)

Answer:

The frequency the cyclist observes is 1029.412 Hz

Explanation:

Here we have that the frequency is given by the relation;

[tex]f_{obs} = f_{source}\left (\frac{v \pm v_{obs}}{v \pm v_{source}} \right )[/tex]

Where:

[tex]f_{obs}[/tex] = Frequency sensed by the observer

[tex]f_{source}[/tex] = Frequency emitted by the source = 1,000 Hz

v = Velocity of sound in air

[tex]v_{obs}[/tex] = Speed of observer = + 10 m/s

[tex]v_{source}[/tex] = Speed of source  = 0 m/s

Plugging in the values, we have;

[tex]f_{obs} =1000 \times \left (\frac{340 + 10}{340 + 0} \right ) = 1000 \times \left (\frac{350}{340 } \right ) = 1029.412 \ Hz[/tex]

Therefore, the frequency the cyclist observes = 1029.412 Hz.

The phenomenon described in the question is known as the Doppler Effect, used to explain why a moving observer perceives a change in frequency. Given the conditions in the problem, the cyclist would perceive the siren's frequency to be approximately 1029.4 Hz instead of 1000 Hz.

The phenomenon described in the question relates to the Doppler Effect, which involves a change in frequency of a wave (in this case, sound) due to the relative motion between the source of the wave and the observer.

When the observer is moving towards the source of a sound, the frequency they perceive is higher than the actual frequency of the sound. This perceived frequency (f') can be calculated using the formula:

f' = f * (v + vo) / v

Where: f is the actual frequency, v is the speed of sound, and vo is the speed of the observer (cyclist).

Substituting the given values:

f' = 1000 Hz * (340 m/s + 10 m/s) / 340 m/s = 1029.4 Hz

Therefore, the cyclist will observe a frequency of approximately 1029.4 Hz.

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Answer:

Internal hardware is physical parts that help the computer work; software is the programs and applications that make the computer work.

Explanation:

Credit to the guy above me

The difference between internal hardware and software lies in their physical nature and functions within a computer system. Internal hardware refers to the tangible components of a computer, while software consists of the programs and applications that enable the computer to perform tasks.

The difference between internal hardware and software lies in their physical nature and functions within a computer system. Internal hardware refers to the tangible components of a computer, such as the motherboard, processor, memory, and storage devices, that are housed inside the computer's casing. These components work together to enable the computer to perform tasks.

On the other hand, software refers to the intangible programs and applications that are installed on the computer and instruct the hardware on how to perform specific tasks.

For example, the operating system (e.g., Windows, macOS, Linux) is a type of software that manages and controls the computer's hardware, allowing users to interact with the computer and run other software applications.

Applications like word processors, web browsers, and media players are also examples of software that users can install and use on their computers.

In summary, internal hardware comprises the physical components of a computer, while software consists of the programs and applications that enable the computer to perform tasks.

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Answer: B. The last quarter. Half of the moon's surface will be visibly illuminated.

Answer:

B. Last Quarter

When 20 J of work is done in 4 seconds, the power is 5 watts

Power is the rate at which work is done, expressed in watts.

In this case, if 20 J of work is done in 4 seconds, the power can be calculated as follows:

Power = Work done / Time taken

Power = 20 J / 4 s

= 5 watts

The direction of the induced magnetic field will be the same as the direction of the external magnetic field.

As per Felhming's right-hand rule: The direction of the magnetic field is perpendicular to the wire and is in the direction of the fingers of your right hand.

The direction of induced current in the coil is clockwise. Since the magnet is being moved away, the magnetic flux linked with the coil must be decreasing. Hence the induced magnetic field must be in the same direction as the external magnetic field.

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Answer:

D. impossible to estimate

Explanation:

According to the doppler effect, the frequency of the wave will increase.

let u be the speed of the submarine,

let the speed of sound in water be c,

let initial frequency of the sent out wave be f,

let frequency of received wave be f'

The distance occupied by the new wave will be (c - u), therefore, the new wavelenght will be (c - u)/f

Frequency = speed of sound ÷ wavelenght

therefore the new Freq f' will be

f' = cf/(c - u) which will be shorter than the initial wavelenght.

But we do not know the speed of the submarine, so we can't estimate.

Answer:

Explanation:

Mechanical Advantage of a wheel and axle is defined as the ratio of the load on the axle to the effort applied on the wheel. It can also be described as the ratio of the radius of the wheel (larger radius) to the radius of the axle (smaller radius).

Mechanical advantage = Load/ Effort = R/r

Given the wheel radius as 4 inches and the axle radius as 0.25 inches.

MA = R/r = 4/0.25

MA = 16

Mechanical advantage of the wheel and axle is 16

b) Using the formula Mechanical Advantage = Load/ Effort

Given MA = 16, Effort = 16lbs, Load =?

On substitution, 16 = Load/6

Load = 16*6

Load = 96lbs

The resistance force that can be overcomed with the effort is 96lbs

When viewed from a point on the positive z-axis (looking downward), the subsequent motion of the electron in a region with a uniform magnetic field in the positive z-direction will be in a circular path around the z-axis. This path is perpendicular to both the electron's velocity vector and the magnetic field direction.

The motion of charged particles like electrons in a magnetic field is governed by the Lorentz force equation:

F = q * (v x B)

where:

F is the magnetic force acting on the electron,

q is the charge of the electron,

v is the velocity of the electron,

B is the magnetic field vector.

Since the velocity of the electron (v) is in the positive x-direction, and the magnetic field (B) is in the positive z-direction, the cross product (v x B) will result in a force perpendicular to both the x and z axes. This force causes the electron to move in a circular path around the z-axis.

This motion is commonly referred to as circular motion in a magnetic field, and it is similar to the way charged particles move in a cyclotron or a particle accelerator. The electron will continue to move in this circular path as long as it remains in the region with the uniform magnetic field and no other forces act on it.

Hence, When viewed from a point on the positive z-axis (looking downward), the subsequent motion of the electron in a region with a uniform magnetic field in the positive z-direction will be in a circular path around the z-axis. This path is perpendicular to both the electron's velocity vector and the magnetic field direction.

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Answer:

B - Opposite, and direct

The word inverse means c) opposite and is an alternative word for indirect relationship.

In mathematics, this often refers to a situation where one value increases while the other decreases, creating a contrasting effect between the two variables.

Types of Relationships: When discussing relationships between variables:

A direct relationship means that as one variable increases, the other variable also increases.

An inverse relationship, on the other hand, indicates that as one variable increases, the other decreases.

In this context, the question asks for an alternative word for inverse relationships. The correct option would be that it is an alternative word for an indirect relationship since as one variable goes up, the other goes down, highlighting the opposite effect.

Answer:

Purple

Explanation:

They've all gone for the same amount of time, but purple is pointed the highest

pls vote me brainliest

Answer:

Magnetic domains

Explanation:

The areas in which the individual magnetic orientations of atoms line up are called magnetic domains.

In most magnetic materials, atoms are arranged in such a way that the magnetic orientation of one electron cancels out the orientation of another

In magnetic domain electrons have the same magnetic orientation. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction.

Answer:

the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time

Explanation:

Answer:

Magnitude (in kilogram) of the resultant force, [tex]|M| = 1958.53 kg[/tex]

Direction = 164.37°

Explanation:

The two forces exerted by the two tugboats are non zero vectors, therefore they can be expressed as:

For the 1620 kg tugboat in the direction N35degrees​W

[tex]M_{1} = 1620 cos \theta_1 i + 1620 sin \theta_1 j\\[/tex]

The direction of the force from the positive x - axis, [tex]\theta_1 = 90 - 35 = 55^{0}[/tex]

The equation above then becomes:

[tex]M_{1} = 1620 cos 55 i + 1620 sin 55 j\\ M_{1} = (1620 * 0.57) i + (1620*0.82) j\\M_{1} = 923.4 i + 1328.4j[/tex]

For the 1250 kg tugboat in the direction S50degrees​W

[tex]M_{2} = 1250 cos \theta_2 i + 1250 sin \theta_2 j\\[/tex]

The direction of the force from the positive x - axis,

[tex]\theta_2 = - (90 - 50) = - 40^{0}[/tex]

The equation above then becomes:

[tex]M_{2} = 1250 cos(-40) i + 1250 sin (-40) j\\ M_{2} = (1250 * 0.77) i - (1250*0.64) j\\M_{2} = 962.5 i - 800j[/tex]

The resultant vector will be given by:

[tex]M = M_{1} + M_{2} \\ M = 923.4 i + 1328.4j + 962.5 i - 800j\\M = 1885.9i + 528.4j[/tex]

The magnitude of the resultant is given by:

[tex]|M| = \sqrt{1885.9 ^{2} + 528.4^2 } \\|M| = \sqrt{3556618.81 + 279206.56}\\|M| = \sqrt{3835825.37} \\|M| = 1958.53 kg[/tex]

The direction will be given by :

[tex]cos \theta = \frac{a}{|M|} \\cos \theta = \frac{1885.9}{1958.53}\\cos \theta = 0.963\\\theta = cos^{-1} 0.963\\\theta = 15.63^0[/tex]

Direction = 180 - 15.63 = 164.37°

Answer:

[tex]\dot{W_{H} } = 4244.48 Btu/h[/tex]

Explanation:

Temperature of the house, [tex]T_{H} = 70^{0} F[/tex]

Convert to rankine, [tex]T_{H} = 70^{0}+ 460 = 530 R[/tex]

Heat is extracted at 40°F i.e [tex]T_{L} = 40^{0}F = 40 + 460 = 500 R[/tex]

Calculate the coefficient of performance of the heat pump, COP

[tex]COP = \frac{T_{H} }{T_{H} - T_{L} } \\COP = \frac{530 }{530 - 500 }\\ COP = \frac{530}{30} \\COP = 17.67[/tex]

The minimum power required to run the heat pump is given by the formula:

[tex]\dot{W_{H} } = \frac{\dot{Q_{H} }}{COP} \\[/tex]...............(*)

Where the heat losses from the house, [tex]\dot{Q_{H} } = 75,000 Btu/h[/tex]

Substituting these values into * above

[tex]\dot{W_{H} } = \frac{75000}{17.67} \\ \dot{W_{H} } = 4244.48 Btu/h[/tex]

Answer:0.316 m

Explanation:

The spring is stretched by 0.316 m, when force is exerted.

If a spring is stretched from its equilibrium position, then a force with magnitude proportional to the increase in length from the equilibrium length is pulling each end.

F = kx

where k is the proportionality constant called the spring constant or force constant.

Given, a screen door spring has a spring constant of 188 N/m, and when stretched,  a 59.5 N force is applied on the door.

Substitute the values, we get

59.5 = 188 x

x =  0.316 m

Thus, the spring is stretched by 0.316 m, when force is exerted.

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Answer:

they will be moving east and west, or perpendicular to particles of the wave.

Explanation:

Answer:

The answer is B: Perpendicular to the particles of the wave

Explanation:

Answer:

Due to gravity on the earth but on moon there is 1/6th of the gravity than on earth. Since the acceleration of gravity Is lesser in moon and weight is constant, the weight of an object is lesser on the surface of the moon.

Explanation:

Answer: C.

The gravitational pull of Earth is greater than that of the Moon.

Explanation: plato

Answer: Length, thickness, and temperature

Explanation:

I did it

Resistance of a material is affected by its length, thickness, temperature, and type of material; voltage does not determine resistance.

The factors that affect the resistance of a material include the length of the resistor, thickness of the resistor, the temperature of the conductor, and the type of material. Length affects resistance because the longer a conductor, the more collisions charges will make with its atoms, increasing resistance. The thickness of a resistor affects resistance inversely; a thicker conductor has a greater cross-sectional area, allowing more current to flow and decreasing resistance.

The temperature affects resistance because as a conductor gets hotter, the atoms vibrate faster, increasing kinetic energy and making it more difficult for the electric current to flow. Different materials also have different inherent resistances due to their atomic structures. Voltage does not affect resistance; rather, resistance determines how much voltage is required to drive a certain current through a conductor.

Astronauts must have their own supply of oxygen in their spacesuits during spacewalks due to the absence of breathable air in the vacuum of space, and to protect them from harmful solar radiation and the extreme temperatures of space. The suits also maintain positive pressure relative to the outside to prevent air from the vacuum of space from entering the suit if a leak occurs.

Astronauts must have their own supply of oxygen within their spacesuits during spacewalks because outer space does not have an atmosphere like the Earth which contains beneficial and breathable air; instead, space is a vacuum. This absence of atmosphere leaves astronauts exposed to the direct speed and force of solar radiation which can be harmful and potentially lethal. Their spacesuits, equipped with their own oxygen supply, not only enable astronauts to breathe but also serve as a barrier to protect them from this radiation and the extreme temperatures of space. The suit also maintains a positive pressure relative to the outside, ensuring that if a leak occurs, air will flow out of the suit, not into it from the vacuum of space.

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Answer:

514.5 meters

1687.9921 feet

Explanation:

speed of sound = 343 m/s

1.5 (seconds) x 343 (m/s) = 514.5 meters

The distance of the lightning strike is approximately 514.5 meters or 0.5145 kilometers away, calculated by multiplying the time delay of the thunder clap (1.5 seconds) with the average speed of sound (343 m/s).

If a thunder clap comes 1.5 seconds after a lightning strike, you can estimate the distance of the strike from your location. Since the speed of sound varies with temperature, we'll use the average speed of sound at room temperature, which is approximately 343 meters per second. To calculate the distance, you multiply the time it takes to hear the thunder (1.5 seconds) by the speed of sound (343 m/s), which equals to about 514.5 meters or roughly 0.5145 kilometers away.

The answer is V=25(7.5/(7.5+5)).

This is the voltage divider equation.

I hope this helps!

Answer:

I am so sorry

Explanation:

if your still here. Have you taken the algebra 2 B unit 8 semester B exam??