Melanie ran the 100 meters race in 12 seconds what was her avarage speed?​

Answer:

the correct answer is d

on a tall, dry mountain peak

Explanation:

A telescope is an instrument that allows the observation of distant bodies whose light is very dim, for this the telescope concentrates a large amount of light with large diameter lenses or mirrors.

The location of a telescope must take into account several aspects:

* The most important that there are no nearby lights that disturb the observation, so it must be away from cities and other strong light sources.

* The climate should be as stable as possible with few temperature variations, to prevent the optical surfaces from fogging up and reducing the thermal expansion that changes the length of the instrument.

* You must choose a place with little rain and therefore little amount of clouds

Based on these needs we can answer which luxury will be the most suitable

a) There is a lot of light nearby

b) there is a lot of humidity and wind

c) there is a lot of light

d) This is an ideal place with low light, low humidity and stability in the climate

e) lots of humidity and light

so the correct answer is d

Answer:

D

Explanation:

The LIGHT GATHERING ability of a telescope is defined by its area

 a 30 meter scope has  an area of 225 pi    the 10 m scope has an area of 25 pi     so the   30 m scope can gather 9 times more light

The internal pressure of the rock formation causes fluid to return to the surface through the wellbore,the fluid is called as flowback.

When the infusion interaction is finished, the internal pressure of the rock arrangement makes liquid re-visitation of the surface through the wellbore. This liquid is known as both "flowback" and "created water" and may contain the infused synthetics in addition to normally happening materials like saline solutions, metals, radionuclides, and hydrocarbons. The flowback and created water is regularly put away on location in tanks or pits before treatment, removal or reusing. Generally speaking, it is infused underground for removal. In regions where that isn't a choice, it could be dealt with and reused or handled by a wastewater treatment office and afterward released to surface water.

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The minimum value of the transmission signal bandwidth in the case of a multi-level PAM signal with 64 levels, using a symbol waveform of a square pulse, is 8 kHz. The symbol rate is also 8 kHz.

In a multi-level PAM (Pulse Amplitude Modulation) signal, the number of levels determines the number of distinct amplitudes that can be transmitted. In this case, there are 64 levels.

To determine the minimum value of the transmission signal bandwidth, we need to consider the Nyquist criterion. According to the Nyquist theorem, the minimum bandwidth required for a signal is twice the highest frequency component of the signal. Here, the highest frequency component of the voice signal is 3.4 kHz.

Since the voice signal is sampled at a frequency of 8 kHz, the Nyquist criterion tells us that the minimum bandwidth required for transmission is 2 * 3.4 kHz = 6.8 kHz. However, in practice, it is common to choose a slightly higher value to account for the practical implementation considerations. Therefore, the minimum value of the transmission signal bandwidth is rounded up to 8 kHz.

The symbol rate is the number of symbols transmitted per second. In this case, since the voice signal is sampled at 8 kHz, the symbol rate is also 8 kHz.

Moving on to the second part of the question, when transmitting the PAM signal into binary data using PCM (Pulse Code Modulation) encoding, we need to consider the bandwidth and bit rate.

To determine the bandwidth of the transmission signal when using PCM encoding with a square wave pulse, we need to apply the Nyquist criterion again. The Nyquist criterion states that the bandwidth is equal to the highest frequency component of the signal. In PCM encoding, the highest frequency component is half the sampling rate, which is 4 kHz (8 kHz / 2).

Therefore, the bandwidth of the transmission signal when using PCM encoding with a square wave pulse is 4 kHz.

The bit rate is the number of bits transmitted per second. In PCM encoding, each sample of the PAM signal is quantized and represented using a fixed number of bits. Since the symbol rate is 8 kHz and each symbol is represented by 6 bits (64 levels), the bit rate is calculated as 8 kHz * 6 bits = 48 kbps.

In summary, the bandwidth of the transmission signal when using a multi-level PAM signal with 64 levels and a square wave pulse is 8 kHz, with a symbol rate of 8 kHz. When using PCM encoding with a square wave pulse, the bandwidth of the transmission signal is 4 kHz, with a bit rate of 48 kbps.

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Answer:

The forces are balanced

Explanation:

For an object to be unbalanced, each force has to be in the opposite direction of another force and have equal strength.

Taking a look at this photo:

The forces are balanced because the left and right side both have forces acting in the opposite direction and will equal strength, 25 Newtons.

The same is said about the top and bottom of the rectangle, but the equal strength is 10 Newtons.

At each point in a circular journey, an object's direction and speed change. Centripetal force is the name given to the force that results in this velocity or acceleration. Thus, option B is correct.

Centripetal force is felt by a vehicle travelling in a circle. A circularly moving body is subject to a centripetal force that pushes toward the center of the circle it is travelling in.

Therefore, Centripetal force is the force that keeps an object moving in a circular motion when it is travelling due to velocity, or its speed in a particular direction. By attracting an object to a circle's center, it achieves this.

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The induced emf in the loop as a function of time is ε(t) = a * B_a * e^(-a*t) * A.

The magnetic flux through the loop as a function of time is given by Φ = B(t) * A, where B(t) is the magnetic field and A is the area of the loop.
In this case, the magnetic field is given by B(t) = B_a * e^(-a*t), where B_a is the initial magnetic field magnitude and a is a constant.
Therefore, the magnetic flux through the loop as a function of time is Φ(t) = B_a * e^(-a*t) * A.
To find the induced electromotive force (emf) in the loop as a function of time, we use Faraday's law of electromagnetic induction, which states that the emf induced in a loop is equal to the rate of change of magnetic flux through the loop. The induced emf (ε) in the loop is given by ε = -dΦ/dt, where dΦ/dt represents the derivative of magnetic flux with respect to time.
Taking the derivative of Φ(t), we get ε(t) = -d/dt (B_a * e^(-at) * A) = a * B_a * e^(-at) * A.

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The final induced electromotive force (emf) in the loop is represented by the equation -aBₐeᵃt·A. This equation combines factors such as magnetic field strength (B), loop area (A), and exponential decay (eᵃt) to determine the emf.

The induced emf in the loop can be calculated using the formula:

emf = -d(Φ)/dt,

where emf represents the induced electromotive force, Φ is the magnetic flux through the loop, and dt is the change in time.

In this case, the magnetic field B is given as B = Bₐeᵃt, where Bₐ is a constant and a represents a constant rate of change with respect to time.

The magnetic flux Φ through the loop can be determined by integrating the magnetic field over the enclosed area S:

Φ = ∫B·dA,

where dA represents an infinitesimal area element.

To calculate the induced emf, we differentiate the magnetic flux Φ with respect to time:

d(Φ)/dt = d/dt ∫B·dA.

Since the magnetic field B is constant over the enclosed area S, it can be taken out of the integral:

d(Φ)/dt = ∫d(B·dA)/dt.

Applying the differentiation inside the integral:

d(Φ)/dt = ∫(dB/dt)·dA.

As the magnetic field B = Bₐeᵃt, differentiating with respect to time yields:

dB/dt = aBₐeᵃt.

Substituting this expression into the equation for d(Φ)/dt:

d(Φ)/dt = ∫aBₐeᵃt·dA.

Since the magnetic field B is perpendicular to the plane, the integral simplifies to:

d(Φ)/dt = aBₐeᵃt·A,

where A represents the area of the loop.

Finally, we obtain the induced emf:

emf = -d(Φ)/dt = -aBₐeᵃt·A.

In conclusion, the induced emf in the loop is given by -aBₐeᵃt·A.

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Answer:

Pressure is defined as the force per unit area: P = F/ A, or in terms of magnitude, P = mg/A, where mg is the weight of the fluid.

Explanation:

These two forces are called action and reaction forces and are the subject of Newton's third law of motion.

Have a luvely day!

In an open system, both energy and matter are exchanged with the surroundings.

In a closed system, only energy is exchanged with the surroundings.

In an isolated system, neither matter nor energy is exchanged with the surroundings.

In the greenhouse, only energy is exchanged with the surroundings.

Thus, the greenhouse is a closed system.

Hello!

When the object is hung from the spring, the force of the spring balances out the force due to gravity. In terms of equations:

\(\Sigma F = F_g - F_s\\\\0 = F_g - F_s\\\\F_s = F_g\)

The force of a spring is equivalent to:
\(F_s = -kx \\\)

k = Spring Constant (3000 N/m)
x = Extension of spring (0.05 m)

**Negative sign means the force is in the opposite direction of the extension. For example, if you pull a spring, the spring force tries to collapse the spring, aka it works against you

The force due to gravity is equivalent to:
\(F_g = mg\)

m = mass (? kg)
g = acceleration due to gravity (9.81 m/s²)

Solving for mass:
\(kx = mg\\\\m = \frac{kx}{g}\\\\m = \frac{3000(0.05)}{9.81} = \boxed{15.29 kg}\)

Answer: You could tell if you made an error in your calculations by repeating the steps.

Speed of light is the fastest/maximum in vacuum which is equal to 3 × 10^8 m/s, therefore speed of light through any material equal to 4 × 10^8 m/s is physically and theoretically impossible and therefore incorrect.

Explanation:

Answer:

Heat

Explanation:

All materials have go some sort of heat.

Answer:Since the friction  force is non-conservative as potential energy. All the work done by the friction forces results in a transfer of energy into thermal energy of the box  floor  system.

Explanation:

The apparent magnitude of a star refers to its brightness as seen from your eyes and absolute magnitude being the actual brightness of a star.

Magnitude can be defined as a unitless measure which is used to show the brightness of an object in comparison with the brightness of another object.

Basically, there are two types of magnitude and these include the following:

In conclusion, the apparent magnitude of a star refers to its brightness as seen from your eyes and absolute magnitude being the actual brightness of a star.

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I'm pretty sure it's apparent; absolute

Answer:

Myanmar, also known as Burma, has a long history of innovation and invention. In fact, many Burmese inventions have had a significant impact on the world.

One of the most notable Burmese inventions is the modern version of the solar-powered calculator, which was invented by a Burmese scientist named U Aung Kyaw in 1971. This invention revolutionized the calculator industry and paved the way for other solar-powered devices.

Another significant invention from Myanmar is the water filter, which was invented by Dr. Than Htut in 1980. The water filter has helped to provide clean drinking water to people in developing countries around the world.

Additionally, Myanmar has a rich history of traditional medicine and herbal remedies that have been used for centuries. Many of these remedies have been scientifically proven to be effective and are still used today.

Therefore, it is incorrect to say that there are no inventors in Myanmar. The country has a long history of innovation and continues to produce talented scientists and inventors who make significant contributions to various fields.

Explanation:

Read the above.

the height above the central maximum, y1, of the first bright spot above is half the distance between the two bright fringes, which is 2.05 mm.

The distance between two bright fringes is given as 4.1 mm. Since the first bright fringe above and the first bright fringe below are equal distances from the central maximum, we can say that the distance between the central maximum and the first bright fringe above is half of 4.1 mm, which is 2.05 mm. Therefore, the height above the central maximum, y1, of the first bright spot above is 2.05 mm.
Your question is about finding the height above the central maximum, y1, of the first bright spot above, given that the two bright fringes are 4.1 mm apart.
The height above the central maximum, y1, of the first bright spot above is 2.05 mm.

Since the first bright fringe above and the first bright fringe below are equal distances from the central maximum, we can divide the total distance between them by 2 to find the height above the central maximum, y1, of the first bright spot above. So, y1 = (4.1 mm) / 2 = 2.05 mm.

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A 500. Kg car is driving with a speed of 4.00 m/s, the momentum of car is 2000 kg.m/sec

Momentum is characterized as the intensity of a body's motion. As momentum relies on both velocity and the direction of the body's motion, it is quantified by "mass velocity". Because velocity is a vector, momentum is a also a vector quantity, whereas mass is a scalar number.

Given that,

mass of car (m) = 500 kg

velocity of car (v) = 4.00 m/sec

Thus, momentum (p) = m × v

p = 500 kg × 4.00 m/sec

p = 2000 kg.m/sec

Thus, momentum of car is 2000 kg.m/sec

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Answer:

The reason is because the pressure of the air inside the room drops with time which makes opening the door to require an increased amount of force to make up for the reduced pressure inside the room

Explanation:

From the kinetic theory of gases we have the following relation;

\(v_{rms} = \sqrt{\dfrac{3 \cdot K \cdot T}{m} }\)

\(p = \dfrac{n \cdot MW \cdot v^2_{rms} }{3 \cdot V}\)

Where:

K = Boltzmann constant

T = Temperature

m = Mass

MW = Molecular weight

V = Volume

\(v_{rms}\) = Root mean square velocity

Whereby the room door is closed, the kinetic energy of the air particles will be used up such that the average velocity of the particles will decrease, given that the volume of the room is constant, the pressure inside the room will drop below the original pressure outside the room such that the force on the door due to the outside pressure is larger than the force on the door from inside the room requiring a larger amount of force to overcome the resistance of the now higher outside pressure force.

The statement "For tapping frequency (Hz), as numbers approach 0, it means that people are going slower" is True.

The tapping frequency or rate is the number of times that one taps their finger in one second. It is measured in Hertz (Hz), which is the number of taps per second.According to the question, when tapping frequency (Hz) approach 0, it means that people are going slower. As the frequency of tapping approaches zero, the person is tapping less frequently and thus slowing down.Frequency is defined as the number of cycles completed per unit time. It also tells about how many crests go through a fixed point per unit time.

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The velocity of the ride after 2.3 s is 22.54 m/s and the distance of fall is 25.291 m.

Velocity is the directional speed of an object in motion as a demonstration of its price of change in position as located from a selected frame of reference and as measured by a particular popular of the time.

Velocity is the top indicator of the location in addition to the rapidity of the item. it may be defined as the gap blanketed by means of an item in unit time. pace can be defined because of the displacement of the item in unit time.

Velocity is the quickness of movement or motion. A synonym is a celerity; an easier phrase is velocity. In physics, speed specifically refers to the size of the fee and the path of exchange in the position of an item. it's miles a vector amount that specifies both the speed of a frame and its path of movement.

For velocity:-

v = u + at

  = 0 + 9.8 × 2.3

  = 22.54 m/s

For distance:-

S = ut + 1/2at²

since the initial velocity is 0.

S =  1/2 at²

   = 1/2 × 9.8 × (2.3)²

    = 25.291 m

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In order the count rate to decrease from 16,000 counts per minute to 500 counts per minute in the experiment using radon-219, it will take approximately 3 minutes and 45 seconds

The count rate of a radioactive substance follows an exponential decay model given by:

N(t) = N₀ * e^(-λt)

Where:

N(t) is the count rate at time t

N₀ is the initial count rate

λ is the decay constant

t is the time

We can rearrange the equation to solve for time (t):

t = (1/λ) * ln(N₀/N(t))

In this case:

Initial count rate (N₀) = 16,000 counts per minute

Final count rate (N(t)) = 500 counts per minute

To determine the decay constant (λ), we need to know the half-life of radon-219. Let's assume that the half-life of radon-219 is 3.96 seconds.

The decay constant (λ) can be calculated using the formula:

λ = ln(2) / (half-life)

λ = ln(2) / 3.96 seconds

Substituting the values into the equation to calculate the time (t):

t = (1/λ) * ln(N₀/N(t))

t = (1 / (ln(2) / 3.96 seconds)) * ln(16,000 counts per minute / 500 counts per minute)

t ≈ 225.29 seconds or approximately 3 minutes and 45 seconds

Therefore, the count rate = 3 minutes and 45 seconds

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Answer:causes acceleration

Explanation:

Answer:

  3.6 kN

Explanation:

Given a giant squid has a mass of about 0.37 tons, you want its weight in newtons.

Weight in newtons is the force that results from the acceleration of a mass by gravity.

  F = ma

  F = (0.37 Mg)(9.8 m/s²) ≈ 3.6 kN

__

Additional comment

We can multiply 0.37 t = 370 kg by g = 9.80655 m/s² to get 3628.4605 N. However, the mass is given to 2 significant figures, so the product cannot be more precise than 2 significant figures. That is why we rounded it to 3600 N or 3.6 kN.

1 Mg is 1000 kg, or 1 t (metric ton)

Answer:

d = 11.77 m

Explanation:

Given that,

A ball is droped off the side of a bridge after 1.55 seconds.

We need to find how far it has fallen.

It will fall under the action of gravity. It would mean that a = g = 9.8 m/s²

Let it is fallen at a distance d. d can be calculated using second equation of motion as follows :

\(d=ut+\dfrac{1}{2}at^2\)

Put u = 0 and a = g

So,

\(d=\dfrac{1}{2}\times 9.8\times (1.55)^2\\\\d=11.77\ m\)

Hence, it will fall at a distance of 11.77 m.

Answer:

-11.77!!!! DONNT FORGET NEGATIVE

Explanation:

Answer: b is sedimentary. c is metamorphic. and a is igneous.

Explanation:

1) Solar energy

2) Mechanical energy

3) Electrical energy and light energy

4) Mechanical energy

5) Heat and light energy

6) Electrical energy

Energy transformation, also known as energy conversion, is the process by which energy is transferred from one form to another. Energy exists in many forms, including thermal energy, light energy, kinetic energy, potential energy, and chemical energy. In any energy transformation, the total amount of energy remains constant, but its form changes.

The efficiency of an energy transformation is the percentage of the input energy that is transformed into useful output energy. In some cases, some energy is lost as heat or waste, decreasing the overall efficiency of the transformation.

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In an AC circuit, the time lag between the source and the resistor voltages is most often reported as a phase difference, 0, between the source and the resistor.

4) The phase difference is determined by equating the ratio of time lag and period to phase difference and 27:

tlag=T/21Since the period of the voltage cycle is 1/f, this relation simplifies to:6ftlag=210=2πftlag

The AC voltage source can be represented by the function, V = Vo cos (2πft +

B

The combustion of the fuel in the helicopter is chemical energy. The vertical change in height is the result of kinetic energy. Because the helicopter is hovering in the air, it has gravitational potential.

Answer:

this would be B friend :)

Explanation:

We are given:

Radius of Venus=  6 * 10⁶ m

Height above the planet's ground = 9.4 * 10⁶ m

Mass of Venus = 4.867 * 10²⁴ kg

Finding the Gravitational Field:

We first need to calculate the distance between the center of masses

Distance between center of masses:

Since the point is above the surface of Venus, the radius of Venus and the height will add

Distance between the center of masses = 9.4*10⁶ + 6 * 10⁶

Distance (r) = 15.4 * 10⁶ m

Now back to Gravitational field!

We know the formula for Gravitational Field:

g = GM / r² [where g is the gravitational field, M is the mass of the planet, r is the distance between the center of masses and G is the gravitational constant]

plugging the known values in the formula:

g = (6.67 * 10⁻¹¹ * 4.867 * 10²⁴) / (15.4*10⁶)²       [G = 6.67*10⁻¹¹ Nm²/kg²]

g = (32.46 * 10¹³) / (237 * 10¹²)

g = (32.46 * 10¹³) / (23.7 * 10¹³)

g = 32.46/23.7                                                   [the 10¹³ got cancelled out]

g = 1.367 N/kg² (or m/s²)

Explanation:

Distance travelled (d) = 56 metres

Time taken (t) = 7 seconds

velocity of the object (V)

= d / t

= 56 / 7

= 8 m/s

The velocity of the object is 8 m/s.

Hope it will help :)