A hiker shouts towarda vertical cliff 685 m away. The echo is
heard 4.00 s later. What is the speed of the sound in this air?
a423.8 m/s
b 253.6 m/s
c 342.5 m/s

Sound waves are classified into three types, viz., Infrasonic, Audible, and Ultrasonic. These three types of waves differ from each other based on their frequency ranges and wavelengths.

Infrasonic waves have frequencies less than 20 Hz and wavelengths greater than 17 meters. Audible waves have frequencies between 20 Hz to 20,000 Hz and wavelengths between 17 meters to 1.7 cm. Ultrasonic waves have frequencies greater than 20,000 Hz and wavelengths less than 1.7 cm.

Infrasonic waves are generally produced by natural sources such as volcanic eruptions, earthquakes, thunderstorms, etc. They are also produced by large man-made sources such as explosions, jet engines, wind turbines, etc. The human ear cannot detect these waves, but they can cause physiological and psychological effects such as nausea, disorientation, anxiety, etc.

Audible waves are the sounds that humans can hear, produced by a variety of natural and man-made sources such as human voices, musical instruments, animals, etc. The frequency range of audible waves is subdivided into three ranges - low-pitched sounds (20 Hz to 250 Hz), mid-pitched sounds (250 Hz to 4000 Hz), and high-pitched sounds (4000 Hz to 20,000 Hz). Different musical instruments produce different types of sounds, depending on their frequencies.

Ultrasonic waves are commonly used in a wide range of applications such as medicine, industry, and defense. They are used in medical imaging (ultrasound), cleaning, welding, cutting, etc. Ultrasonic waves are also used in animal communication, particularly in the communication of bats, dolphins, and some other marine mammals. Humans cannot hear these waves, but animals can, which makes them highly useful in these applications.

The three types of sound waves, infrasonic, audible, and ultrasonic, differ from each other based on their frequency ranges and wavelengths. Infrasonic waves have frequencies less than 20 Hz and wavelengths greater than 17 meters. Audible waves have frequencies between 20 Hz to 20,000 Hz and wavelengths between 17 meters to 1.7 cm. Ultrasonic waves have frequencies greater than 20,000 Hz and wavelengths less than 1.7 cm.

Infrasonic waves are produced by natural sources such as volcanic eruptions, earthquakes, thunderstorms, etc., and large man-made sources such as explosions, jet engines, wind turbines, etc. The human ear cannot detect these waves, but they can cause physiological and psychological effects such as nausea, disorientation, anxiety, etc.

Audible waves are the sounds that humans can hear, produced by a variety of natural and man-made sources such as human voices, musical instruments, animals, etc. The frequency range of audible waves is subdivided into three ranges - low-pitched sounds (20 Hz to 250 Hz), mid-pitched sounds (250 Hz to 4000 Hz), and high-pitched sounds (4000 Hz to 20,000 Hz). Different musical instruments produce different types of sounds, depending on their frequencies.

Ultrasonic waves are commonly used in a wide range of applications such as medicine, industry, and defense. They are used in medical imaging (ultrasound), cleaning, welding, cutting, etc. Ultrasonic waves are also used in animal communication, particularly in the communication of bats, dolphins, and some other marine mammals. Humans cannot hear these waves, but animals can, which makes them highly useful in these applications.

The three types of sound waves differ from each other based on their frequency ranges and wavelengths. Infrasonic waves have frequencies less than 20 Hz and wavelengths greater than 17 meters, while audible waves have frequencies between 20 Hz to 20,000 Hz and wavelengths between 17 meters to 1.7 cm. Ultrasonic waves have frequencies greater than 20,000 Hz and wavelengths less than 1.7 cm. Each type of wave has its own unique characteristics and applications.

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Answer:

There are four natural states of matter: Solids, liquids, gases and plasma.

Explanation:

The fifth state is the man-made Bose-Einstein condensates. In a solid, particles are packed tightly together so they don't move much.

Answer:

The Full Moon and New Moon

Explanation:

The distance the block sails in the air is 15.8m when the spring with spring constant as 1400N/m is compressed to 17.0 cm , and then launches a 200 g block.

Given the spring constant of spring (k) = 1400N/m

The length of spring that is compressed (x) = 17cm = 0.17m

The mass of the block (m) = 200g = 0.2kg

The coefficient of kinetic friction on the incline is (µ) = 0.210

Let the distance the block sail through air = d

First we need to find the velocity of block when it's released by the spring. Here work done by the block (W) = \(1/2 kx^2\)

\(W = 1/2 * 1400 * (0.17)^2 = 20.23J\)

This work done is equal to the block's change in kinetic energy ∆K such that: W = ∆K and as it is at rest initially the initial kinetic energy is zero.

The final kinetic energy (KEf) = \(1/2mv^2\)

\(20.23 = 1/2 * 0.2 * v^2\)

\(v = \sqrt{202.3} = 14.22m/s\)

Since the block slides at an inclined plane, it forms a 45° angle, and the triangle that has a hypotenuse of length \(\sqrt{2} * (2) = 2.83 m.\)

The net force acting on the block in perpendicular direction to the incline is = F such that: F = N - mg cos(45°) = 0 where

N = mg cos(45°) = 0.2 * 9.8 * 0.7 = 1.39 N

while the net force acting on the block parallel to the surface is = F'

F' = -f - mg sin(45°) = ma where f = µN = 0.21 * 1.39 = 0.29

mg sin(45°) = 0.2 * 9.8 * 0.7 = 1.39N

Since the parallel forces only do work on the block, which is negative due to friction and weight that oppose the block's sliding up the incline. Hence the total work done on the block is then:

W = (-0.291 N - 1.39 N) (2.83 m) = -4.74 J

Since W = ∆K such that:

\(-4.74 J = 1/2 (0.200 kg) (v')^2 - 20.23\)

v' = 12.4 m/s

According to projectile motion as the block travels a horizontal distance d after launched at an angle of 45° with initial speed 12.4 m/s after time t.

\(d = (v')^2sin(2*45)/g = (12.4)^2*sin 90/9.8 = 15.8m\)

Hence the distance the block sails in the air = 15.8m

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complete question: The spring in the figure has a spring constant of 1400 N/m . It is compressed 17.0 cm , then launches a 200 g block. The horizontal surface is frictionless, but the block's coefficient of kinetic friction on the incline is 0.210. what distance d does the block sail through the air? express your answer with the appropriate units.

When using high-power and oil-immersion objectives, a short working distance is required.

High-power objectives and oil-immersion objectives are specialized lenses used in microscopy to achieve high magnification and resolution. These objectives are typically used in advanced microscopy techniques such as oil-immersion microscopy, which involves placing a drop of immersion oil between the objective lens and the specimen.

One important consideration when using high-power and oil-immersion objectives is the working distance. Working distance refers to the distance between the front lens of the objective and the top surface of the specimen. In the case of high-power and oil-immersion objectives, the working distance is generally shorter compared to lower magnification objectives.

The reason for the shorter working distance is the need for increased numerical aperture (NA) to capture more light and enhance resolution. The NA is a measure of the ability of an objective to gather and focus light, and it increases with higher magnification. To achieve higher NA, the front lens of the objective must be closer to the specimen, resulting in a shorter working distance.

This shorter working distance can be a challenge when working with thick or uneven specimens, as the objective may come into contact with the specimen or have difficulty focusing properly. Therefore, it is crucial to adjust the focus carefully and avoid any damage to the objective or the specimen.

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Answer:

3.00 cm/s

Explanation:

my test had the same question -.-

Answer:

I don't know to be honest

Answer:

See the explanation below.

Explanation:

Work in physics is defined as the product of force by the distance that the body travels in the direction of the force.

It can be represented by means of the following equation.

\(W=F*d\)

where:

W = work [J]

F = force [N]

d = distance [m]

In the given example the work is zero since the tree does not move, therefore the bear exerts a force on the tree. But there is no talk of movement of the tree, therefore the work is zero.

Without specific details about the experiments you are referring to, it is challenging to provide a precise outcome. However,

In experiments involving light and materials, the choice of wavelengths can have different effects depending on the specific properties of the material and the nature of the experiment. Different wavelengths of light interact with matter in distinct ways due to the phenomenon of absorption. If the wavelengths chosen were 321 nm and 515 nm, it is possible that the outcome of the experiments would involve different levels of absorption and interaction with the material under investigation. The 321 nm wavelength falls in the ultraviolet (UV) range, while the 515 nm wavelength falls in the visible light range.

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Answer:search this up but put quizzlet at the end it should be there

Explanation:

A herd of deer would be a population (in this case, the individual is the deer).

A population is a group of individuals of the same species living in a particular geographic region.

Moreover, a community is a group of populations living together in a particular ecosystem.

In conclusion, a herd of deer would be a population (in this case, the individual is the deer).

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A golf ball striking the ground is a collision. The ground exerts an equal force on the golf ball. Both these sentences are right.

Newton's third law of motion tells us that "for every action, there is an equal and opposite reaction". This means that when two objects interact, they exert equal and opposite forces on each other.

In the case of the golf ball striking the ground, the action is the force of the golf ball hitting the ground. According to Newton's third law, the reaction to this action is an equal and opposite force exerted by the ground on the golf ball. This is why the golf ball bounces back up after hitting the ground.

The force of the golf ball on the ground and the force of the ground on the golf ball are equal and opposite in magnitude and direction.

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The three elements that the innovation and planning iteration provides are learning, adaptation, and improvement.

The innovation and planning iteration is a process used to develop new ideas and strategies for a project or organization. This process involves several stages, including planning, testing, and refinement. The three key elements that the innovation and planning iteration provides are learning, adaptation, and improvement.

Learning: The innovation and planning iteration provides an opportunity to learn from the results of each stage of the process. By collecting and analyzing data, the team can identify what worked well and what didn't, and use that information to inform the next stage of planning.

Adaptation: The innovation and planning iteration allows for flexibility and adaptation based on what has been learned from previous stages. The team can adjust their plans and strategies based on the feedback and data collected, ensuring that they are moving in the right direction.

Improvement: The innovation and planning iteration provides a way to continually improve and refine the project or organization. By taking an iterative approach, the team can make small improvements over time, leading to more significant progress and success in the long run.

The innovation and planning iteration is an effective way to develop new ideas and strategies, and the three key elements it provides - learning, adaptation, and improvement - are essential for ensuring success. By continually evaluating and refining their plans, teams can stay on track and achieve their goals.

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Answer:

Inversely proportional

Explanation:

P.E ∞ h

K.E ∞ v

v ∞ 1/h

Therefore

K.E ∞ 1/h

Then

P.E ∞ 1/(K.E)

Answer:

Inversely

Explanation:

Hagan's Power-Control Theory is a sociological theory that focuses on the relationship between gender, class, and crime. While the theory has been influential in understanding the gendered nature of crime, it also has some weaknesses. One of the weaknesses of Hagan's Power-Control Theory is:

Simplistic Gender Binary: Hagan's theory relies on a traditional gender binary framework, assuming that power differentials and patterns of crime are solely based on the dichotomy between male and female. This binary perspective overlooks the experiences of individuals who do not fit into traditional gender categories, such as non-binary or gender non-conforming individuals. It fails to account for the complex interplay of gender identity, expression, and power dynamics.

Limited Scope of Power: The theory primarily focuses on the power dynamics within the family, particularly the influence of patriarchal or egalitarian family structures on crime rates. It neglects the broader social, economic, and institutional factors that contribute to power differentials and criminal behavior. By primarily focusing on the family unit, it may underestimate the impact of structural inequalities and societal factors on criminal activities.

Lack of Intersectionality: Hagan's theory does not adequately consider the intersectionality of various social identities, such as race, ethnicity, and socioeconomic status. The theory tends to generalize its findings across diverse populations without accounting for the unique experiences and challenges faced by individuals at the intersection of multiple social categories. This limitation hinders a comprehensive understanding of how power differentials and crime intersect with various dimensions of identity.

Inadequate Empirical Support: While Hagan's Power-Control Theory has generated significant scholarly discussion, some critics argue that it lacks strong empirical evidence to support its claims. The theory's hypotheses and assumptions have not been consistently validated through extensive empirical research. Critics argue for the need to further test and refine the theory to establish its robustness and explanatory power.

It's important to note that these weaknesses do not invalidate the entire theory but rather highlight areas where it may fall short in providing a comprehensive understanding of the complex dynamics of power, gender, and crime. Researchers and scholars continue to engage in critical dialogue and empirical research to address these weaknesses and enhance the theoretical framework.

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Answer:

The average speed is 10,082

Explanation:

Do the formula

Distance * time = speed

2840 * 3.55

= 10,082

ANSWER:

The two movements the turning of the top and the movement of the Earth appear in rotating bodies and are the basis of the gyroscope.

STEP-BY-STEP EXPLANATION:

Depending on whether the top is launched, vertical or inclined, two movements are obtained: the sleeping top or the top that, in addition to turning on itself, describes a circumference, as if it were the Earth around the sun. In the sleeping top, the axis of rotation is perpendicular to the plane (ground) on which you dance. If the top is perfectly symmetrical, its center of gravity must be located at an interior point through which the virtual axis of rotation passes. But, because the top, by mass or construction, is not totally symmetrical, as it loses speed, its axis of rotation tilts and begins to rotate, describing a cone, whose vertex is the tip of the top.

In conclusion, the two movements the turning of the top and the movement of the Earth appear in rotating bodies and are the basis of the gyroscope.

Answer:

6 m/s

Explanation:

Answer:

The work efficiency formula is efficiency = output / input, and you can multiply the result by 100 to get work efficiency as a percentage. This is used across different methods of measuring energy and work, whether it's energy production or machine efficiency.

Explanation:

Hope this helped!!!

Answer:

the answer is most likely likely to be 2

Answer:

i donk know

Explanation:

Star A is twice as bright as star B, and is the same distance away.  So, Star A is four times as luminous as star B.

The luminosity of a star refers to the total amount of energy it radiates per unit of time. It is directly related to the brightness of the star. In this case, we are given that star A is twice as bright as star B and is at the same distance away.

The brightness of a star is related to its luminosity and the distance from the observer. Since both stars are at the same distance, the ratio of their brightness is equal to the ratio of their luminosities.

Given that star A is twice as bright as star B, we can infer that the luminosity of star A is four times (2^2) that of star B. Therefore, star A is four times as luminous as star B.

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Answer:

B

Explanation:

It becomes lighter so it rises

It states that: "At constant volume the pressure of a gas sample is directly proportional to the absolute temperature."

This means that doubling the pressure of the gas will cause its absolute temperature to double.

Mathematically this law is expressed as:

       \(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{\dfrac{P_{1}}{T_{1}}=\frac{P_{2}}{T_2} \iff \ P_1T_2=P_2T1 } \end{gathered}$} }\)

We have that the data is:

P₁ = 0.87 atm

T₁ = 25 °C + 273 = 298 K

T₂ = 50 °C + 273 = 323 K

P₂ = ?

We clear for the final pressure:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{P_{2}=\frac{P_1T_2}{T_{1}} } \end{gathered}$}}\)

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{P_{2}=\frac{(0.87 \ atm)\cdot(323\not{k})}{298\not{k}} } \end{gathered}$}}\)

\(\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{P_{2}=0.94 \ atm } \end{gathered}$}}}\)

The graphical representation of Tara is correct because of energy of the wave depends on the amplitude of the wave.

The energy of a wave due to the motion of a spring is calculated as follows;

E = ¹/₂KA²

where;

Thus, the graphical representation of Tara is correct because of energy of the wave depends on the amplitude of the wave.

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Answer:  No, it is not correct because as the amplitude of a wave increases, the energy it carries also increases. This graph shows that as the amplitude increases, the energy decreases.  

Explanation:

Answer:

Energy = 51840 J = 51.84 KJ

Explanation:

The electrical energy delivered to the toy can be found out by the following formula:

\(Energy = (Power)(time)\\Energy = (VI)(t)\\Enegry = VIt\\\)

where,

V = Voltage = 3 V

R = Resistance = 2.5 Ω

I = Current = V/R (Ohm's Law) = 3 V/2.5 Ω = 1.2 A

t = time = (4 h)(3600 s/1 h) =  14400 s

Therefore,

\(Energy = (3\ V)(1.2\ A)(14400\ s)\\\)

Energy = 51840 J = 51.84 KJ

Answer:

motion of spring,motion of pendulum

According to the given information temperature and velocity  of the following is a vector quantity

A vector quantity is one that just has magnitude, whereas a vector quantity has both orientation and magnitude. Given that it is direction-independent at a given position, heat is a scalar number.

Vectors include gravity and displacement. They possess both a value and a direction. The fact that gravity and displacement are pointing in the same direction in this instance allows us to derive a scalar energy from them (in this example, their direction are down and down, respectively).

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