which best describes what happens with the sonar to sound pulses from a ship after they hit the ocean floor?

A truck travels on a straight road at a velocity of 17 meters per second. Over 20 seconds, it accelerates uniformly to 27 meters per second. The acceleration of the truck was 0.5 m/s^2

The velocity of the truck after 20 seconds is 27 m/s and its initial velocity was 17 m/s, so the change in velocity is:

Δv = 27 m/s - 17 m/s = 10 m/s

The acceleration can be calculated as the change in velocity divided by the time it took to change, so:

a = Δv / t = 10 m/s / 20 s = 0.5 m/s^2

Acceleration is a measure of the rate of change of velocity over time. It is a vector quantity, meaning it has both magnitude and direction, and is defined as the derivative of velocity with respect to time. In other words, acceleration is the rate at which an object's velocity is changing. If an object is moving in a straight line and its velocity is increasing, then it is accelerating. If the velocity is decreasing, then the object is decelerating.

Acceleration has units of meters per second squared (m/s^2). Positive acceleration means an increase in velocity, while negative acceleration means a decrease in velocity. For example, when an object is accelerating upwards, its acceleration is positive, while when it is falling, its acceleration is negative.

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"Power electronics" includes inverters, charge controllers, rectifiers, chargers, dc-dc converters, maximum power point trackers, and power quality equipment.

Power electronics refer to the field of engineering that deals with the conversion, control, and conditioning of electrical power using electronic devices. This field plays a crucial role in various applications, including renewable energy systems, electric vehicles, power supplies, and industrial automation.

Within the context of the question, power electronics devices such as inverters are used to convert DC power to AC power, charge controllers regulate the charging of batteries from solar panels,

rectifiers convert AC power to DC power, chargers replenish the energy stored in batteries, dc-dc converters convert DC voltage levels, maximum power point trackers optimize the power output of solar panels, and power quality equipment ensures the stability and reliability of the power supply.

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A situation that involves the transfer of heat by means of convection must involve the exchange of fluid currents such as land and sea breezes.

Heat transfer by convection is a method of heat transfer by which heat is transferred between two bodies through through currents of moving fluids or gases.

The following are examples of heat transfer by convection;

Thus, a situation that involves the transfer of heat by means of convection must involve the exchange of fluid currents such as land and sea breezes.

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Answer:

Umm Lucy will weigh to many pounds

Explanation:

The stress element shown in the question represents a critical point on a specimen whose yield strength is 65 ksi. However, the material will not yield under the given stress state because both the maximum normal stress and maximum shear stress are less than the yield strength of the material.

The stress element shown in the question represents a critical point on a specimen, meaning that the stresses acting on the specimen are close to or at the yield strength of the material. The yield stress of the material, in this case, is σy = 65 ksi.

To determine whether the material will yield or not, we need to compare the maximum normal stress and maximum shear stress acting on the specimen with the yield strength of the material.

The maximum normal stress (σmax) occurs on the plane perpendicular to the applied load and is given by:

σmax = (σx + σy)/2 + sqrt((σx - σy)^2/4 + τxy^2)

Where σx and σy are the normal stresses in the x and y directions respectively, and τxy is the shear stress acting on the plane.

From the stress element shown in the question, we can see that σx = 40 ksi, σy = 30 ksi, and τxy = -20 ksi. Substituting these values in the above equation, we get:

σmax = (40 + 30)/2 + sqrt((40 - 30)^2/4 + (-20)^2)
σmax = 35 ksi

We can see that σmax is less than the yield strength of the material (65 ksi), which means that the material will not yield under the given stress state.

The maximum shear stress (τmax) occurs on the planes inclined at 45 degrees to the x and y axes and is given by:

τmax = sqrt((σx - σy)^2/4 + τxy^2)

Substituting the values from the stress element, we get:

τmax = sqrt((40 - 30)^2/4 + (-20)^2)
τmax = 25 ksi

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Answer:heart

The hardest working muscle is the heart. It pumps out 2 ounces (71 grams) of blood at every heartbeat. Daily the heart pumps at least 2,500 gallons (9,450 liters) of blood. The heart has the ability to beat over 3 billion times in a person's life.

Explanation:hope this helps

Answer:

1) combustion can be used as a source of energy.

Combustion is used to power rockets

ii) Decomposition of sugar is a chemical change and new substances are formed.

2)corrosion of pipes

Corrosion of bridges

Corrosion of knives and blades at home

I) iron rusts due to the action of air and moisture bon the metal setting up an electrochemical process in which the iron is the anode. This leads to the corrosion of the iron metal.

ii) Rusting is a problem because it reduces the economic value of iron. Rust weakens iron and threatens the integrity of materials made from iron.

Iron rusting may lead to the collapse of a bridge

Iron rusting makes a blade blunt

Iron rusting weakens pipes made of iron

iii) Rusting of iron can be prevented by galvanizing the iron or by painting the iron.

3) chemical change leads to the formation of a new substance while physical change does not lead to the formation of a new substance.

Chemical changes are not easily reversible while physical changes are easily reversible.

ii)condensation of water vapour is a physical change

iii)

Electrolysis of water;

Two moles of water---> two moles of hydrogen gas + one mole of oxygen gas

Synthesis of water;

two moles of hydrogen gas + one mole of oxygen gas---->Two moles of water

Decomposition of sugar;

One mole of Sucrose---> twelve moles of carbon + eleven moles of water + heat

Six moles of carbon dioxide + six moles of water +energy------> one mole of sugar + six moles of oxygen

Explanation:

Combustion is useful as a source of energy because it is used in power generation. Currently, combustion is being used to power rockets. It is also used as a way of providing heat at home.

One of the characteristics of a chemical change is that it leads to the formation of new substances. Since the decomposition of sugar leads to the formation of carbon and water, it is an irreversible chemical change.

When water is heated, it is converted into vapour which can settle on a surface and convert back to liquid water. This is a physical change.

The electrical field along the horizontal axis is 3.36N/C and the 8.11N/C along the vertical axis

Data;

The electrical field force is given as

\(E = \frac{kQ}{r^2}\)

The distance apart will be

\(r = \sqrt{1.1^2 + 2.6^2} = 2.8m\)

Let's find E1 and E2

E1 will be

\(E_1 = \frac{-9*10^9 * 7.5*10^-^9}{2.8^2} = -8.61N/C\)

E2 will be

\(E_2 = \frac{-9*10^9*1.5*10^-^9}{2.8^2} = -1.72N/C\)

Let's find the angle between the charges

\(tan\theta = \frac{2.6}{1.1} \\\theta = 67.04^0\)

The value E12

\(E_1_2 = |E|cos\theta = 8.61(cos67.04) = 3.36N/C\)

The value of E21 = 0

The value of electrical field along the horizontal axis

\(E_x = 3.36 N/c\)

The value along the vertical axis

\(E_1_y = -|E_1|sin \theta = -7.93 N/C\\E_2_y = E_2 sin 90^0 = -1.72N/C\\E_y = \sqrt{7.93^2 + 1.72^2}= 8.11N/C\)

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During the day, the radio primarily receives AM (Amplitude Modulation) stations from a nearby city due to the influence of various factors, including the behavior of radio waves and the Earth's atmosphere :

During the day, the ground wave propagation is more effective than the skywave propagation. The ground wave of AM stations from nearby cities is able to propagate relatively well and reach your location. However, the ground wave's range is limited due to absorption, reflection, and refraction caused by the temperature gradient in the lower atmosphere. At night, the absence of solar radiation on the ionosphere causes it to become more reflective. This leads to an increase in skywave propagation, enabling AM signals from more distant cities to bounce off the ionosphere and reach your location. The increased range allows you to pick up stations from the distant city that were previously beyond the reach of the ground wave during the day.

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Answer:

mechanical wave -> a wave that requires a medium through which to travel

wave -> a disturbance that transfers energy from one place to another place

medium -> the matter that waves flow through

Answer:

Medium - The matter that waves flow through

Mechanical wave - A wave that requires a medium through which to travel

Wave - A disturbance that transfers energy from place to another

.

Hope this helps! <3

The primary indicator of an object's position and speed is its velocity.It is the distance that an object travels in one unit of time.The displacement of the item in one unit of time is the definition of velocity.

Smax = 400 feet.

c) v = 32 ft/s

c) v = - 32 ft/s

(a)

The following is the function provided for ball height:

s = 160 t - 16 t²

Therefore, we must take the derivative with respect to t and make it equal to zero in order to get the time to reach maximum height (in-flexion point):

So, 160 - 32 t = 0, 32 t = 160 t, and 160/32 t = 5 sec.

As a result, the maximum distance is covered every 5 seconds.

Smax = (160)(5) - (16)(5)²

Smax = 800 - 400

Smax=400 feet

b)First, we determine the speed at which the ball travels 384 feet.

384 = 160 t - 16 t

16 t² - 160 t + 384 = 0

Quadratic Equation Solving:

Either:

t = 6 sec

or t = 4 seconds

Since it takes 5 seconds to reach the highest point,

t then equals 5 seconds.

t then equals 4 seconds.

Now, by taking a derivative of ods with respect to t at 4 sec, we can find velocity:

v = 160 - 32 t

v = 160 - (32)(4)

v = 32 ft/s

c,Because t = 6 s > 5 s

The second number of t = 6 sec must represent the point in the ball's downward motion when it is 384 feet above the earth.

So, at that moment, velocity will be:

v = 160 - (32)(6)

v = -32 ft/s

downward motion is a bad sign.

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Explanation:

Optics is a branch of physics that is the study of light and vision. ... The branch of physics dealing with the nature and properties of electromagnetic energy in the light spectrum and the phenomena of vision. In the broadest sense, optics deals with infrared light, visible light, and ultraviolet light.

Explanation:

vertical force = 460,000 * sin(70) - 300,000

Fv = 187,717.75N

Elastic potential energy is initially at rest, making it move.

Elastic potential energy is what causes a ball to bounce or rebound because it is transformed into kinetic energy and used to raise the ball back up. However, because some of the ball's energy was transferred to the ground or changed into sound (in the noise it makes upon impact) and heat energy, the ball won't go as high as it did at first (friction with the table). Additionally, even though we cannot see it, the ball alters once it strikes the ground or a table, energy is needed to take shape for a brief period of time.

Because of this, each bounce has a slightly lower height than the one before it. The ball has some kinetic energy when it hits the floor, but some of it is changed, so it loses some of it each time it bounces. After a few bounces, the ball has so little kinetic energy remaining that it stops bouncing.

Thus the correct answer is option A.

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Answer:

Explanation:

The speed of the wave given only it's frequency and wavelength can be found by using the formula

\(c = f \times \lambda\)

where

c is the velocity of the wave in m/s

\( \lambda\) is the wavelength in m

f is the frequency in Hz

From the question we have

c = 8 × 24 = 192

We have the final answer as

Hope this helps you

The electrons are transferred from one item to another during the conduction process.The electrons are particles with a free charge.There is no free movement of protons.

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The speed and kinetic energy of an object of mass m moving in a circular orbit of radius r and speed v about a planet of mass M is given by v = √(GM/r), KE = ½m(GM/r).

What is kinetic energy?
The energy an object has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the stated velocity. The body holds onto the kinetic energy it acquired during its acceleration until its speed changes. The body exerts the same amount of effort when slowing down out of its current speed to the a state of rest. Officially, a kinetic energy would be any term that includes a derivative to respect to time in the Lagrangian of a system.

Speed:

The speed of an object of mass m moving in a circular orbit of radius r with speed v around a planet of mass M is given by:
v = √(GM/r)
where G is the gravitational constant (6.67 × 10-11 N*m2/kg2).

Kinetic Energy:
The kinetic energy of an object of mass m moving in a circular orbit of radius r with speed v around a planet of mass M is given by:
KE = ½mv2
Substituting the expression for v into this equation, we get:
KE = ½m√(GM/r)2
KE = ½m(GM/r)

Therefore, the speed and kinetic energy of an object of mass m moving in a circular orbit of radius r and speed v about a planet of mass M is given by:

v = √(GM/r)
KE = ½m(GM/r)

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The ground emits more energy than it absorbs, the ground: cools down. The correct option is d.

When the ground emits more energy than it absorbs, it means that the ground is losing more heat energy than it is gaining from incoming radiation. This leads to a net loss of energy from the ground, resulting in a cooling effect.

The ground gains energy primarily through the absorption of solar radiation. However, various factors such as cloud cover, atmospheric conditions, and time of day can affect the amount of solar radiation reaching the ground.

In some situations, the ground may receive less incoming radiation than it emits as thermal radiation, particularly during nighttime or in certain geographic regions.

As the ground continues to lose more energy than it gains, its temperature decreases, leading to a cooling effect. This cooling process helps to restore an energy balance, where the energy gained from incoming radiation matches the energy lost through emission, eventually reaching a state of equilibrium. The correct option is d.

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when the ground emits more energy than it absorbs, the ground . group of answer choices

a. is in equilibrium

b. heats up

c. changes its albedo

d. cools down

Answer:

I don't know what do u. mean

Answer:

The resultant vector is 45.3 N 40.74° North of East

Explanation:

The given vectors can be presented as follows;

35 km at 25 degrees N of E = 35 × cos(25)·\(\mathbf{\hat i}\)  + 35 × sin(25)·\(\mathbf{\hat j}\)  

15 km at 10 degrees E of N = 15 × cos(90 - 10)·\(\mathbf{\hat i}\)  + 15 × sin(90 - 10)·\(\mathbf{\hat j}\)  

15 km at 10 degrees E of N = 15 × cos(80)·\(\mathbf{\hat i}\)  + 15 × sin(80)·\(\mathbf{\hat j}\)  

The sum of the vectors becomes;

∑d = 35 × cos(25)·\(\mathbf{\hat i}\) + 15 × cos(80)·\(\mathbf{\hat i}\) + 35 × sin(25)·\(\mathbf{\hat j}\)  + 15 × sin(80)·\(\mathbf{\hat j}\)  

∑d ≈ 34.33·\(\mathbf{\hat i}\) + 29.56·\(\mathbf{\hat j}\)

The magnitude of the resultant vector = √(34.33² + 29.56²) ≈ 45.3 N

The direction = tan⁻¹(29.56/34.33) ≈ 40.74° North of East

The resultant vector = 45.3 N 40.74° North of East

The 232Th sample has a greater number of nuclei than the 235U sample due to its longer half-life.

The number of nuclei in a radioactive sample decreases with time due to decay. The rate of decay is determined by the half-life of the radioactive isotope.

The 232Th sample has a longer half-life than the 235U sample, which means that it decays more slowly and has a greater number of nuclei at any given time.

Therefore, the 232Th sample has a greater number of nuclei than the 235U sample. This is also supported by the fact that the initial activity (measured in Becquerels, Bq) of both samples is the same, indicating that they started with the same number of nuclei.

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Comparing the results, you will find that the 232Th sample has a greater number of nuclei than the 235U sample.

Consider two radioactive samples: A 185 MBq sample of 235U, whose half-life is 7.1 x 10^8 years, and a 185 MBq sample of 232Th, whose half-life is 1.4 x 10^10 years. To compare the number of nuclei in each sample, we can use the formula:

Number of Nuclei = (Activity × Half-life) / Decay constant

First, we need to find the decay constant for each sample:

Decay constant = 0.693 / Half-life

For 235U:
Decay constant (235U) = 0.693 / (7.1 x 10^8 years)

For 232Th:
Decay constant (232Th) = 0.693 / (1.4 x 10^10 years)

Now, we can calculate the number of nuclei for each sample:

Nuclei (235U) = (185 MBq × 7.1 x 10^8 years) / Decay constant (235U)
Nuclei (232Th) = (185 MBq × 1.4 x 10^10 years) / Decay constant (232Th)

Comparing the results, you will find that the 232Th sample has a greater number of nuclei than the 235U sample.

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Answer:

Approximately \(1.04 \; {\rm J \cdot g^{-1} \cdot K^{-1}}\).

Explanation:

Multiply energy input by efficiency to find the useful energy output:

\(\begin{aligned}& (\text{useful out}\text{put}) \\ &= (\text{efficiency})\, (\text{energy in}\text{put}) \\ &= (87.5\%)\, (1560\; {\rm kJ}) \\&= (0.875)\, (1560\; {\rm kJ}) \\ &= 1365\; {\rm kJ}\end{aligned}\).

In other words, \(1365\; {\rm kJ}\) of energy was supplied to the air in the building.

The standard unit of energy is Joules (\({\rm J}\).) Apply unit conversion:

\(\begin{aligned}(1365\; {\rm kJ})\, \left(\frac{10000\; {\rm J}}{1\; {\rm kJ}}\right) = 1.365\times 10^{6}\; {\rm J}\end{aligned}\).

Let \(c\) denote the specific heat capacity of the air in this building. Let \(m\) denote the mass of the air.

Let \(Q\) denote the energy supplied to the air. Let \(\Delta T\) denote the change in temperature. The equation \(Q = c\, m\, \Delta T\) relates these quantities.

In this question, the change in the temperature of the air in this building is:

\(\Delta T = (22.1\; {\rm ^{\circ} C}) - (11.6\; {\rm ^{\circ} C}) = 10.5\; {\rm K}\).

Rearrange the equation \(Q = c\, m\, \Delta T\) to find specific heat capacity \(c\):

\(\begin{aligned}c &= \frac{Q}{m\, \Delta T} \\ &= \frac{1.365 \times 10^{6}\; {\rm J}}{(125\; {\rm kg})\, (10.5\; {\rm K})} \\ &\approx 1.04 \times 10^{3}\; {\rm J \cdot kg^{-1} \cdot K^{-1}}\end{aligned}\).

Answer:

The total frictional force equals 60 N

Explanation:

We know that F - f = ma where F is the applied force, f is the frictional force, m the mass of the object and a its acceleration.

Now, since the cart moves with constant velocity, its acceleration is zero. So, a = 0.

So F - f = ma

F - f = m(0) = 0

F - f = 0

So, F = f

From the above, we see that the frictional force equals the applied force which is equal to 60 N.

So, f the total frictional force equals 60 N

It will take 2.857 minutes (or about 2 minutes and 51 seconds) for the fish to reach a temperature of 60 °C.

To determine the time it will take for the fish to reach a temperature of 60 °C, we can use the principle of heat conduction and the concept of temperature difference.

We know that the rate of heating by conduction is proportional to the temperature difference between the body and its surroundings. Therefore, we can write the following equation:

(T - Ts) = k * t

where T is the temperature of the fish, Ts is the temperature of the surroundings (boiling water), k is the proportionality constant, and t is the time.

Given that the initial temperature of the fish is 20 °C and it takes 5 minutes to reach 30 °C, we can substitute these values into the equation:

(30 - 100) = k * 5

-70 = 5k

Solving for k, we find k = -14.

Now we can use this value of k to find the time it will take for the fish to reach 60 °C:

(60 - 100) = -14 * t

-40 = -14t

Dividing both sides by -14, we get t = 2.857 minutes.

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The vehicle will accelerate by 20 g, or in terms of g. A change in an object's velocity with respect to time might serve as a demonstration of acceleration.

An object's acceleration can be thought of as a vector quantity that exhibits both magnitude and direction. The first derivative of the velocity of an object in time can be used to express acceleration.

Calculating the average acceleration is as simple as dividing the velocity difference by the time change.

Acceleration is calculated as (final velocity minus initial velocity)/time.

The car's starting speed is indicated as u = 30 m/s.

The final speed was 0 m/s.

The duration of the automobile, t = 0.15 s

The typical acceleration is equal to (0–30)/0.15 = –200 m/s2.

Car acceleration is equal to 200/9.8 = 20 g.

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Answer:

meter

Explanation:

please make me brainllist

Answer:

33.23 m

Explanation:

At the point where both objects will meet, the vertical height will be equal.

From the equations of motion, the vertical height of the body falling at any time is given as

(y - y₀) = ut + ½gt²

y = vertical height at any time T

y₀ = initial height of the object = 81.5 m

u = initial velocity = 0 m/s (body was dropped)

g = -9.8 m/s²

(y - 81.5) = 0 - 4.9T²

y = 81.5 - 4.9T² (eqn 1)

For an object thrown up, the vertical height of the body at any time, t, is given as

(y - y₀) = ut + ½gt²

y = vertical height of the object at any time t

y₀ = initial height of the object = 0 m

u = initial velocity = 40 m/s

g = -9.8 m/s²

y = 40t - 4.9t² (eqn 2)

At the point where the two objects meet, we equate eqn 1 and eqn 2

y = y

81.5 - 4.9T² = 40t - 4.9t²

But T = (t + 2.2) (Since object 2 was dropped 2.2 s after object 1)

81.5 - 4.9(t + 2.2)² = 40t - 4.9t²

81.5 - 4.9(t² + 4.4t + 4.84) = 40t - 4.9t²

81.5 - 4.9t² - 21.56t - 23.716 = 40t - 4.9t²

81.5 - 21.56t - 23.716 - 40t = 0

57.784 = 61.56t

t = (57.784/61.56) = 0.93866 = 0.94 s

Therefore, the vertical height at t = 0.93866 s is

y = (40×0.93866) - 4.9(0.93866²) = 33.23 m

Hope this Helps!!!

Answer: decantation and screening

Explanation:

Answer:

it is A

Explanation:

the person above me helped