Plz help me I will give brainliest

Option d is correct i.e. The wave model explains this behavior because waves can move through space without needing a medium.

According to the wave model of electromagnetic radiation, light and other forms of electromagnetic waves are characterized by oscillating electric and magnetic fields that propagate through space. Unlike mechanical waves, such as sound waves, electromagnetic waves do not require a medium (a material substance) to travel through. They can travel through empty space, such as a vacuum, as well as through different materials.

A scientist wants to explain the behavior of electromagnetic radiation which allows it to move through space. The correct explanation the scientist could use is:

d. The wave model explains this behavior because waves can move through space without needing a medium.

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Answer: \(2520\)¢

Explanation:

Given

Company charges \(10\)¢ per cubic inch

The dimension of the box is \(9\ in.\times 7\ in.\times 4\ in.\)

The volume of the box is

\(V=9\times 7\times 4\\V=252\ in.^3\)

Therefore cost associated with it is

\(\Rightarrow C=10\times 252\\\Rightarrow C=2520\)

Thus, the cost is \(2520\)¢.

Answer:

25.20

Explanation:

Answer:

The energy an object has due to its motion is called kinetic energy

Explanation:

Factors Affecting Kinetic Energy: the kinetic energy of an object depends on both its speed and its mass.

Answer:

kinetic energy

Explanation:

In physics, the kinetic energy (KE) of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.

The scenario provided is an excellent model for fission, as it demonstrates the chain reaction that occurs when a neutron collides with a uranium nucleus and splits it into two smaller nuclei, releasing a large amount of energy in the process.

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Answer:

voltage ,current and resistance

The reaction of the floor is as follows:

The reaction of the floor on the man is equal to the weight of the man and the upward force.

A)  When the lift moves upwards with steady speed.

R = 80 * 9.8 + * 80 * 0

R = 784 N

B) When the lift moves upwards with acceleration 0.4m/s

R = 80 * 9.8 + * 80 * 0.4

R = 816 N

In conclusion, the reaction of the floor changes as the body accelerates upwards.

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Answer:

4.1°c

Explanation:

Multiply 5/9 (5 over 9) by temp F and subtract 32 = 4.1°c

Converting 65 degree Fahrenheit to celcius scale is equal to 18.33 degree Celsius.

Step 1: Information is provided

95°F is the current temperature in Fahrenheit.

Step 2: Converting degrees Fahrenheit to degrees Celsius formula

T°C=T°F-32×5/9

The temperature in Celsius is T°C.

The temperature in Fahrenheit is expressed as T°F.

3. Convert 95 °F to degrees Celsius.

T°C=T°F-32×5/9

=65-32×59

=33×59

=18.33°C

As a result, 95°F is equivalent to 35°C.

We employ the same conversion formulas found in the majority of textbooks. To convert temperatures from degrees Fahrenheit to degrees Celsius, multiply the result by.5556 (or 5/9) after subtracting 32. When converting from degrees Celsius to Fahrenheit, multiply the result by 1.8 (or 9/5) and then by 32.

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The level of measurement for the variable "the amount of resistance a suspect displays towards the police, measured as not resistant, somewhat resistant, or very resistant" is the ordinal level of measurement. An ordinal level of measurement provides information about the order of things.

It indicates the relative ranking of variables in a particular group but does not provide precise quantitative measures.The ordinal level of measurement ranks observations in a particular order, from the smallest to the largest, or from the least to the most, based on some specific criteria. The distance between any two consecutive categories is not the same.

In the given variable, we cannot compare the exact resistance of suspects because the difference between each category is not equal and is based on police perception rather than a precise measure.Main answer: The level of measurement for the variable "the amount of resistance a suspect displays towards the police, measured as not resistant, somewhat resistant, or very resistant" is the ordinal level of measurement.The ordinal level of measurement is used to sort data into categories. Ordinal scales may also be employed to measure attitude, satisfaction, or quality. The data can be put into a specific order, but the distance between data points cannot be measured.

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Answer:

The earth has more gravity so that means if you jump out of a plane without a parachute u will die. But the moon has less gravity so u will not die when hit ground. But someone can probally explain it better than me.

More gravity equals more speed in some cases like falling

Answer:

Power divided by velocity is force.

Explanation:

Ignore the guy above htey just want points he will proboly be banned soon anyways yourwelcome!

The thing that happens when you push or pull a water tube is that the force makes the tube to speed up, slow down, or be in one place.

It is very hard when pulling  water and if a person need to consistently pull air out of the tube before water makes it to the pump, it is very  difficult and some pumps may or cannot do it.

In regards to pushing, when a person is pushing above the Center of Gravity, one is pushing the said object into the ground and thus is increasing the rate of friction.

If a person is pulling you are said to be pulling above the Center of Gravity and lowering friction.

So, The thing that happens when you push or pull a water tube is that the force makes the tube to speed up, slow down, or be in one place.

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Answer:

a) 14.2sec

b) 1394m away if horizontal speed never changes

c) 9.8m/s

Explanation:

The wavelength of the sound wave produced by the guitar string is 8.33 meters. the wavelength of a sound wave is directly proportional to its frequency. This means that as the frequency of the wave increases, its wavelength also increases. In the case of the guitar string, the low E note produces a sound wave with a relatively low frequency, which results in a longer wavelength.

The wavelength of the sound wave produced by the guitar string,
wavelength = speed of sound / frequency
Plugging in the given values, we get:
wavelength = 343 m/s / 41.2 Hz
wavelength = 8.33 meters

When an object or a system undergoes periodic motion, it vibrates at a specific frequency. Frequency refers to the number of cycles or vibrations that occur in a given time period, usually measured in Hertz (Hz) or cycles per second.

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A thermal energy transfer portfolio would be an excellent way for students to showcase their knowledge and understanding of this important scientific concept.

Thermal energy transfer is the energy transfer between two or more objects that have different temperatures. This energy transfer can take place in three different ways: conduction, convection, and radiation. A portfolio is a collection of documents or pieces of work that demonstrate a person's skills, abilities, and achievements in a particular area.

Therefore, a thermal energy transfer portfolio would be a collection of documents or pieces of work that demonstrate a person's skills, abilities, and achievements related to thermal energy transfer. This portfolio could include lab reports, experimental data, diagrams, and explanations of the various ways thermal energy can be transferred.

For example, a student's thermal energy transfer portfolio might include:

1. A lab report detailing an experiment they conducted to measure the rate of heat transfer through different materials using conduction.

2. A diagram showing the process of heat transfer through convection in a fluid, such as air or water.

3. A written explanation of the concept of radiation and how it relates to thermal energy transfer.

4. A spreadsheet of data showing the temperature changes in a system as heat is transferred through it.

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An aluminum alloy can withstand 207 MPa in tension with an 11 mm internal flaw, other factors like residual stresses may also contribute to failure and should be considered.

According to the statement, an aluminium alloy can survive internal flaws up to a sizeable 207 MPa when under tensile stress. The value is established based on the presumption that the defect is a crack-like defect and that it is the solitary element causing the component to fail. This cobduring operation. Remaining strains, for example, may also have an impact on the component's failure, therefore it's crucial to keep this in mind. To assure the component's safety and dependability, it is crucial to take into account a variety of variables and conduct thorough testing.

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A solid sphere and a spherical shell with the same radius and mass rolling down a frictionless ramp will land farther is  solid sphere

The moment of inertia of a solid sphere is (2/5)mr^2, while that of a spherical shell is (2/3)mr^2, where m is the mass and r is the radius.  When rolling down the ramp, these objects convert potential energy into kinetic energy, which includes both translational and rotational components. The total kinetic energy of a rolling object is K = (1/2)mv^2 + (1/2)Iω^2, where v is the linear velocity, ω is the angular velocity, and I is the moment of inertia.

Since the solid sphere has a lower moment of inertia, it is more efficient at converting potential energy into translational kinetic energy. This results in the solid sphere reaching a higher linear velocity than the spherical shell, causing it to reach the bottom of the ramp more quickly and land farther compared to the spherical shell. A solid sphere and a spherical shell with the same radius and mass rolling down a frictionless ramp will land farther is solid sphere.

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I) Tension in the spring = 2N

ii) Angular speed of the bung=5 rads-¹

iii) The time(T) it takes to make one complete revolution=1.256 seconds

Formula used to calculate the time(T) it takes to make one complete revolution = 2π √(l/g)

l = radius= 40cm = 0.4m

g = acceleration due to gravity = 10m/s-²

π =3.14( constant)

T = 2× 3.14 × √0.4/10

T = 6.28 ×√0.04

T = 6.28 × 0.2

T= 1.256 seconds

Formula to calculate angular speed(w)= 2π/T

where T= 1.256 secs

Therefore w = 2×3.14/1.256

w = 6.28/ 1.256

w = 5 rads-¹

Formula to calculate Tension in the spring(F)

= mrw²

where m= 200 g = 0.2kg

r = radius= 40cm = 0.4m

w = angular speed = 5 rads-¹

Therefore F = 0.2 × 0.4 × 5²

= 0.08 ×25

= 2N

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A piece of wool is rubbed between two balloons. When brought close to one another, two balloons will resist one another. because the balloons' surfaces will be equally charged.

With a woolen cloth, two inflated two balloons are rubbed together and brought in close proximity. If they repel one another, it indicates that the charge on each balloon has a unique character after rubbed. Since similar charges attract one another, if the two balloons repel one another, it indicates that they have the same kind of charge.

Wood and plastic become electrified when woolen cloth is rubbed against them because of the friction created by the rubbing. Therefore, as compared to wool, plastic has a higher electron affinity.

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Answer:

4 m

Explanation:

\(v = f \times  λ\)

speed of sound wave (according to question)

= 1 × 1000 = 1000m/s

wavelength is represented by λ

therefore to find the wavelength, divide the speed by the frequency of the second wave given by the question

λ of another wave = 1000 ÷ 250 = 4 m

Speed of sound equals wavelength and frequency. The wavelength of the sound wave if the frequency is 250hz is 4 meters.  

Sound requires a medium to propagate in the form of vibration. It is the pattern of disturbance caused by the movement of energy particles propagating through the medium.

Sound waves can travel in the form of transverse and longitudinal waves. When the sound source continues to vibrate in the medium, the vibrations are propagated in the form of sound waves.

The sound waves travel at different speeds in different mediums. the speed of sound waves remains constant in the same medium. The speed of sound waves is directly proportional to wavelength and frequency.

Wavelength(λ) measures the distance between two crests/ two troughs in a wave and its SI unit is a meter. The frequency (f) of a wave is the number of waves that pass in a certain time and its unit is hertz(Hz). The SI unit of the speed sound wave is m/s.

From the givens,

wavelength(λ) = 1 meter.

frequency (f) = 1000hz.

Speed of wave(v) = wavelength × frequency

                              = 1 × 1000

                           v   = 1000 m/s.

speed of wave = 1000 m/s.

frequency = 250hz

wavelength(λ) = speed / frequency

                        = 1000 / 250

                        = 4 meters.

Hence, the wavelength(λ) of a 250 hz sound wave is 4 meters.

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Answer

decreased attention span

Explanation:

Answer:

11.1s

Explanation:

Given parameters:

Height of cliff  = 600m

Unknown:

How long it takes to hit the ground  = ?

Solution:

To solve this problem, we use one of the kinematics equation;

    H  = ut  +  \(\frac{1}{2}\)gt²  

H is the height

u is the initial velocity  = 0m/s

t is the time taken

g is the acceleration due to gravity

             600 = \(\frac{1}{2}\) x 9.8 x t²  

              600  = 4.9t²  

                 t²  = 122.5

                 t  = 11.1s

After 20 s, the motorcycle attains a speed of

\(\left(4\dfrac{\rm m}{\mathrm s^2}\right)(20\,\mathrm s)=80\dfrac{\rm m}{\rm s}\)

and it continues at this speed for the next 40 s. So at 45 s, its speed is 80 m/s.

Answer:

it helps me

Explanation:

:))) ...

....

A. after you iron a piece of clothing it is warm - Conduction

B. steam coming off hot coffee - Convection

C. getting a sunburn - Radiation

A. The transfer of heat from the iron to the clothing occurs through conduction.

Conduction is the process of heat transfer between two objects in direct contact, where heat energy flows from the higher temperature object (the iron) to the lower temperature object (the clothing).

B. The steam coming off hot coffee represents convection. Convection is the process of heat transfer through the movement of a fluid or gas. In this case, as the hot coffee heats the surrounding air, the air rises and carries the steam upward, creating a convective flow of heat energy.

C. Getting a sunburn involves radiation. Radiation is the transfer of heat energy through electromagnetic waves. In this case, the sun emits radiation, including ultraviolet (UV) rays, which are absorbed by the skin, leading to sunburn.

The heat energy from the sun is transferred to the body without the need for direct contact or a medium for conduction or convection.

These examples illustrate different modes of heat transfer: conduction, convection, and radiation.

Each mode operates differently based on the mechanism by which heat energy is transferred, highlighting the diverse ways in which heat can move from one object to another.

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The false statement is B) Homolytic bond cleavage yields neutral radicals in which each atom gains one electron.

In homolytic bond cleavage, each atom retains one electron from the shared pair of electrons, resulting in the formation of two neutral radicals, where each atom retains its original number of electrons.

No atoms gain or lose electrons in this process.

In a homolytic bond cleavage, a covalent bond is broken, and the shared pair of electrons is split equally between the two atoms involved in the bond.

This results in the formation of two neutral radicals, with each atom retaining one of the electrons from the shared pair.

A radical is a chemical species characterized by the presence of an electron that is unpaired, meaning it does not have a partner electron with which it forms a complete pair. When a covalent bond is homolytically cleaved, each atom involved in the bond gains one electron, resulting in the formation of two radicals.

These radicals are highly reactive due to the presence of the unpaired electron, which makes them prone to participate in further chemical reactions.

It's important to note that in homolytic bond cleavage, there is no transfer of electrons from one atom to another.

Instead, the bond is broken in a way that allows each atom to retain one of the electrons, leading to the formation of two neutral radicals.

Therefore, statement B, which suggests that each atom gains one electron, is false.

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Answer:

displacement, acceleration, potential energy

Explanation:

pretty sure this is correct but dont hold me to it.

The set of three that can have maximum magnitudes at the same instant of time will be displacement, acceleration, and potential energy.

Simple harmonic motion is periodic motion caused by a restoring force that is proportionate to the deviation from equilibrium.

Simple harmonic motion is periodic motion but many other conditions are dependent.

The object is in simple harmonic motion of the following quantities related to the object.

The set of three that can have maximum magnitudes at the same instant of time will be displacement, acceleration, and potential energy.

Hence the set of three quantities is the options i, iii,v.

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The total distance travelled during the vehicle's journey as found from the speed-time graph is 6.125 m

V = d / t

V = ( u + v ) / 2

V = Average Speed

d = Distance

t = Time

u = Initial velocity

v = Final velocity

During the first 0.5 s, u = 0 and v = 1 m / s.

d = ( 0 + 1 ) * 0.5 / 2

d = 0.25 m

During the next 0.5 s, u and v are equal meaning constant velocity ( V = 1 m / s ).

d = 1 * 0.5

d = 0.5 m

During the next 1 s, u = 1 m / s and v = 1.5 m / s.

d = ( 1 + 1.5 ) * 1 / 2

d = 1.25 m

During the next 2.5 s, u and v are equal meaning constant velocity ( V = 1.5 m / s ).

d = 1.5 * 2.5

d = 3.75 m

During the next 0.5 s, u = 1.5 m / s and v = 0.

d = ( 1.5 + 0 ) * 0.5 / 2

d = 0.375 m

Total distance travelled is the sum of all the individual distances calculated.

Total distance travelled = 0.25 + 0.5 + 1.25 + 3.75 + 0.375

Total distance travelled = 6.125 m

Therefore, the total distance travelled during the vehicle's journey as found from the speed-time graph is 6.125 m

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Answer:

383.2

Explanation:

W=m×g(9.8)×(change in height)

=3×9.8× (45-32)

=3×9.8×13

=383.2

Answer:

The answer is 39.3

Explanation: