Animal studies indicate that

Answer:

The average speed for the whole journey is 44.\(\overline 4\) kilometers per hour

Explanation:

The average speed with which the car travels the distance, v₁ = 50 kilometer per hour

The average speed with which the car returns, v₂ = 40 kilometer per hour

Average speed, v = (Total distance, d)/(Total time, t)

Let 'd' represent the distance travelled, we have;

The time it takes the car to travel to the distance = d/50 hours

The time it takes the car to return = d/40 hours

The total time = (d/50 hours + d/40 hours) = d·(40 + 50)/(40 × 50) hours= 9·d/200 hours

The total distance = d kilometers+ d kilometers = 2·d kilometers

The average speed for the whole journey, v = 2·d kilometers/(9·d/200 hours) = 400/9 kilometers per hours = 44.\(\overline 4\) kilometer/hour.

While the element Krypton was indeed named after the Greek word "kryptos," meaning "hidden" or "secret," the reason for its name is not related to its properties as a secret element.

Krypton was discovered in 1898 by British chemists Sir William Ramsay and Morris Travers. They had been studying the gas that was produced when they evaporated liquid air, and they found that this gas contained a previously unknown element. Ramsay named the element Krypton because of its ability to hide within the other gases in the air, making it difficult to detect.

So, while the name Krypton does have a connection to the idea of secrecy, it is not because the element itself has any particular properties that relate to secrecy. Rather, it was named for its elusive nature and the difficulty in detecting it.

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Answer:

Frequency is the number of revolutions done per second. If one period is 30 seconds, then it takes 30 seconds to complete a single revolution.

So, how many revolutions occur in 1 second?  130

That’s your frequency. It should be obvious that this is the inverse of period.

On another note, angular frequency is the angular distance traveled per second, not revolutions. In a circle, each revolution is a full rotation about a circle, which is  2π

 (radians) Hence the angular frequency, given the above period, is the frequency multiplied by  2π

, since one revolution translates to  2π

 units of angular distance.

In summary, if we call  f

 the frequency (revolutions per second),  ω

 the angular frequency (radians per second) and  T

 your period (seconds per revolution), we have the following relations:

T=1f=2πω

ω=2πf=2πT

Explanation:

When a medical test has the ability to measure what it is intended to measure, it is said to be valid.

Validity is a fundamental property of a test that refers to the degree to which it measures what it is intended to measure.

A test that is valid is one that accurately measures the construct or characteristic it is designed to measure.

For example, if a test is designed to measure reading comprehension, it should accurately measure reading comprehension, rather than measuring some other unrelated construct.

Validity is typically assessed through various methods, such as content validity, criterion validity, and construct validity.

Content validity refers to the extent to which a test measures the content it is supposed to measure, while criterion validity refers to the degree to which a test correlates with an established criterion or gold standard.

Construct validity refers to the degree to which a test measures the construct it is intended to measure, based on a theoretical framework or model.

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Where θ 1 is the angle of the first line, and θ 2 is the angle of the second line.

Angle is the measure of a turn or displacement between two intersecting lines. Angles are typically measured in degrees, with 360 degrees in a full circle. acute angles are smaller than 90 degrees, while obtuse angles are larger than 90 degrees. Straight angles are exactly 180 degrees, while reflex angles are greater than 180 degrees.

The equation for the diffraction grating for the sodium is:
nλ = d sinθ
Where n is the order of the spectrum, λ is the wavelength of the light, d is the distance of the spectrum, and θ is the angle of the light.
For the first order, the initial angular position is:
nλ = d sinθ
θ = sin-1 (λ/d)
For the first order, the final angular position is:
nλ = d sinθ
θ = sin-1 (λ/d)
The angular separation of the two closely spaced yellow lines of sodium is:
Δθ = θ 1 - θ 2
Where θ 1 is the angle of the first line, and θ 2 is the angle of the second line.

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The weight of the hawk is found to be 25 N.

The tension is the force that acts on the wire. Given the fact the we are told in the question that a  hawk sits on a telephone wire. If the wire dips so that it makes a 30 degree angle with the horizontal, and the tension in the wire is 25 N.

The image that depicts this problem have been attached to this solution. Now we have from the image that we have attached to this answer;

W = 2T sin θ

W = 2 * 25 * sin 30

W = 2 * 25 * 0.5

W = 25 N

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Answer:

1) The specific heat is the heat required to be added to a unit mass of the substance to cause a unit rise in its temperature

2) The temperature change is 20.92°C

Explanation:

The given parameters are;

The mass of the substance, m = 2.50 g

The heat released by the sample, ΔQ = 12 calories = 50.208 J

The specific heat capacity of the substance, c = 0.96 J/(g·°C)

Therefore, we have;

Heat released, ΔQ = Mass, m × Specific heat capacity, c × Temperature change, ΔT

Substituting in the known values gives

50.208 J = 2.50 g × 0.96 J/(g·°C) × ΔT

ΔT = 50.208 J/(2.5 g× 0.96 J/(g·°C)) = 20.92°C

The temperature change = 20.92°C

Answer: B

Explanation: The wavelength determines color. The wavelength is measured from crest to crest.

The metal that has the lowest melting point must be the metal that has the lowest density and therefore is easiest to bend. That is metal B.

The melting point of the metal depends upon the types of bonds between the metal atoms. The relationship between the melting point of a substance and the strength of the intermolecular force of that substance is directly proportional. That means that the stronger the intermolecular forces of the substance, the higher the melting point of the substance.

Tungsten has the highest melting point of any metal in the periodic table is 3422 °C.

As the strength of the intermolecular forces increases, more energy is needed to disrupt the attraction between these molecules. As a result, increasing intermolecular forces results in a concomitant increase in melting point.

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Answer:

U = 1.84 10⁻²⁷ J

Explanation:

Electric potential energy is

        U = k q₁q₂/ r

in this case the electric charge is

         q = 2 p

         q = 2 1.6 10⁻¹⁹

         q = 3.2 10⁻¹⁹ C

indicate the distance between the charges is 0.500 m

we calculate

         U = 9 10⁹  3.2 10⁻¹⁹  3.2 10⁻¹⁹ /0.500

         U = 1.84 10⁻²⁷ J

The correct answer is b) never true. When capacitors are connected in series, the equivalent capacitance of the combination decreases. This is because the total charge on the combination is equal to the charge on each individual capacitor, but the voltage across the combination is the sum of the voltages across each capacitor.

The formula for capacitance is C = Q/V, so if the charge is the same but the voltage is higher, the capacitance will be lower.

Therefore, as more and more capacitors are connected in series, the equivalent capacitance of the combination decreases.

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The sequence of energy transformations from the moment the ball is dropped to the moment the board is bent to its maximum extent and the ball is at rest is as follows:

1. The ball has potential energy (gravitational potential energy) from being held above the board.

2. As the ball is dropped, it gains kinetic energy as it accelerates to the ground.

3. When the ball hits the board, the kinetic energy is converted into elastic potential energy as the board bends.

4. As the board continues to bend, the elastic potential energy is converted into thermal energy.

5. Finally, when the board reaches its maximum extent, the ball is at rest and its kinetic energy has been completely converted into thermal energy.

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Solar energy is defined as the conversion of energy that is present in the sun and is one of the renewable energies.

Solar energy can be divided into two categories depending on how it is converted and the type of energy it is converted into.

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The average velocity of the car for the entire trip is 0.018 km/h.

The velocity of the trip is determined from the ratio of change of displacement to total time of motion.

The total displacement of the motion = ( 30 m North -  30 m South) + 40 m est = 40 m west = 0.04 km west

The total time of motion = 2.22 hours

The average velocity of the car for the entire trip is calculated as follows;

v = ( 0.04 km ) / ( 2.22 hrs )

v = 0.018 km/h

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Answer:

The final temperature is 35 °C.

Explanation:

Given that,

Mass of the wooden block, m = 0.2 kg

The specific heat of the block, c = 710 J/(kg°C)

Initial temperature, \(T_i=20^{\circ} C\)

Thermal energy, Q = 2130 J

We need to find the block's final temperature. The thermal energy due to change in temperature is given by :

\(Q=mc(T_f-T_i)\\\\T_i\ \text{is initial temperature}\\\\\dfrac{Q}{mc}=(T_f-T_i)\\\\T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{2130}{0.2\times 710 }+20\\\\T_f=35^{\circ} C\)

So, the final temperature is 35 °C.

Answer:

The kangaroo's acceleration after 5 seconds is 2.5 m/s^2

Explanation:

We can solve this problem using the formula for acceleration:

a = (v_f - v_i) / t

where a is acceleration, v_f is final velocity, v_i is initial velocity, and t is time.

First, we need to find the initial velocity in the southward direction. We know that the kangaroo is initially moving eastward, so its initial velocity in the southward direction is zero.

Next, we need to find the final velocity in the southward direction after 5 seconds. We can use the formula for the velocity of an object undergoing constant acceleration:

v_f = v_i + a*t

where v_i is initial velocity, a is acceleration, and t is time.

The kangaroo starts with an initial southward velocity of zero, and its velocity increases by 2.5 m/s each second for 5 seconds, so its final southward velocity is:

v_f = 0 + 2.5 * 5 = 12.5 m/s

Now we can use the formula for acceleration to find the kangaroo's acceleration after 5 seconds:

a = (v_f - v_i) / t = (12.5 - 0) / 5 = 2.5 m/s^2

Therefore, the kangaroo's acceleration after 5 seconds is 2.5 m/s^2.

Answer:

speakers is going to be your answer

Answer:

doorbells

Explanation:

Answer:

The stress of the movement of tectonic plates caused this fold.

Sorry I don't know the answer to the first part.

The best choice for viewing very small surface structures of a cell would be option (b) a scanning electron microscope (SEM).

A scanning electron microscope is specifically designed to provide high-resolution, three-dimensional images of the surface of specimens. It achieves this by using a focused electron beam to scan the surface of the sample and collecting the electrons that are scattered back. This allows for detailed imaging of the surface structures of cells and other specimens.

In contrast, a transmission electron microscope (option a) is used to examine internal structures of cells by transmitting electrons through thin sections of the specimen.

Options c) brightfield microscope, d) darkfield microscope, and e) phase-contrast microscope are all light microscopes that are commonly used for observing cells and tissues. However, they are not the best choice for viewing very small surface structures of a cell when compared to the specialized capabilities of a scanning electron microscope.

Therefore, option (b) a scanning electron microscope would be the most suitable choice for this purpose.

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Answer:

If the amplitude increases the volume increases and vice versa.So therefor the volume depends on how high or low the amplitude is.

When two or more sound waves occupy the same space, they affect one another. The waves do not bounce off of each, but they move through each other. The resulting wave depends on how the waves line up.

With constructive interference, two waves with the same frequency and amplitude line up – the peaks line up with peaks and troughs with troughs as in diagram A above. The result is a wave that has twice the amplitude of the original waves so the sound wave will be twice as loud.

Answer:

about 2.7liters for women and 3.7liters for men

Explanation:

The angle of the plate will affect how much sunlight hits the plate. The amount of sunlight that hits a surface depends on the angle of incidence, which is the angle at which the sunlight hits the surface. When the angle of incidence is perpendicular to the surface (i.e., the sun is directly overhead), the maximum amount of sunlight is received by the surface.

However, as the angle of incidence increases, the amount of sunlight that hits the surface decreases because the same amount of sunlight is spread over a larger area. Therefore, if the plate is not angled properly to face the sun, it will receive less sunlight, which will affect its efficiency in converting sunlight into electricity.

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That's false.

There are billions of galaxies in the universe. A few of the nearest ones are moving TOWARD us, and ALL the rest are moving AWAY from us.

The farther a galaxy is from us now, the faster it's moving farther away.

The heat supplied to increase the temperature of the substance is used up to transform the state of matter of that substance. Hence the temperature of the substance stays constant until the phase transition completes.

In chemistry, phase transitions or phase changes are the physical processes of transition between a state of a medium of a substance. This term is used to refer to changes in the basic states of matter such as solid, liquid, and gas.

When a substance is heated or cooled and approaches a temperature corresponding to one of its phase transitions. Further gain or loss of heat results in diminishing or enhancing intermolecular attractions, instead of changing the molecular kinetic energies.

While a substance is undergoing a change in state which is a phase transition, its temperature remains constant. The horizontal lines on the graph represent the transition between the states of the substances X and substances Y.

When adding heat leads to the temperature of a substance being increased as the kinetic energy of the molecules of the substance increases. The conduction of heat occurs when these molecules start vibrating with high energy, Hence the heat transfer from one molecule to another.

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Explanation:

Hope it helps my lady.......

302.038 °K

Explanation

to conver from Fahrenheit to kelvin, we can use this formula.

then

Let

now, replace.

therefore, the answer is 302.038 °K

I hope this helps you