GENTE ME AJUDEM NESTA QUESTÃO POR FAVOR, TENHO PROVA ONLINE AMANHÃ! "Um sonar de um navio de pesca localizou um cardume de sardinhas a 300 m de profundidade. Sabendo que a velocidade de propagação do som na água tem o valor de 1500 m/s, calcula o tempo que decorre desde a emissão dos ultra-sons e a sua receção no navio." Por favor!

Answer:

the point on the earth’s surface where the effects of a sudden movement (earthquake) are felt most strongly

पृथ्‍वी का वह भाग जहाँ भूकंप का झटका सबसे अधिक महसूस किया जाता है; अधिकेंद्र

Explanation:

Marie kon hai bro

The stone will strike the ground after approximately 8 seconds.
To solve this problem, we can use the equation of motion for a freely falling object:
h = v₀t - 1/2gt²

Where h is the height of the object at time t, v₀ is the initial velocity, g is the acceleration due to gravity (32.2 feet per second squared), and t is the time elapsed.

At the highest point of its trajectory, the stone's velocity will be zero. Therefore, we can use the given initial velocity to find the time it takes for the stone to reach its maximum height:

v₀ = 96 feet per second
h = 265 feet
t₁ = v₀/g = 96/32.2 = 2.98 seconds

After this, the stone will fall back to the ground. We can use the same equation of motion to find the time it takes to reach the ground:

h = 0 (ground level)
v₀ = -96 feet per second (negative because it is in the opposite direction of the initial velocity)
t₂ = sqrt(2h/g) = sqrt(2(265)/32.2) = 4.01 seconds

The total time it takes for the stone to strike the ground is the sum of the time it takes to reach the maximum height and the time it takes to fall back to the ground:

t = t₁ + t₂ = 2.98 + 4.01 = 6.99 seconds

Rounding to the nearest whole number, we get that the stone will strike the ground after approximately 8 seconds.

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Therefore, the charge moved through an electric potential difference of approximately 0.2401 vol.tsTo find the electric potential difference (ΔV) that the charge moved through, we can use the formula:

ΔV = ΔPE/q

where ΔPE is the change in potential energy and q is the charge.

The change in potential energy can be calculated using the formula:

ΔPE = qΔV

Given that the charge (q) is 4.6 x 10^-6 C, and the velocity (v) is 72.2 m/s, we can find the change in potential energy using the kinetic energy formula:

ΔPE = (1/2)mv^2

where m is the mass of the charge. The mass is given as 47 x 10^-8 kg.

ΔPE = (1/2)(47 x 10^-8 kg)(72.2 m/s)^2

ΔPE = (1/2)(47 x 10^-8 kg)(5220.84 m^2/s^2)

ΔPE = (1/2)(47 x 10^-8 kg)(5220.84 J/kg)

ΔPE = (1/2)(2.2054 x 10^-6 J)

ΔPE = 1.1027 x 10^-6 J

Now we can find the electric potential difference (ΔV):

ΔV = ΔPE/q

ΔV = (1.1027 x 10^-6 J)/(4.6 x 10^-6 C)

ΔV ≈ 0.2401 V

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If you press on the plunger, you increase the pressure of the air, and thus the air in the small syringe escapes out, and hens the large syringe gets expanded.

Also the colored water gets filled inside the larger syringe.

Answer:

The answer is D.

Explanation:

Answer:

0.625m

Explanation:

Now Velocity of a wave ,V = frequency × wavelength

Wavelength =velocity /frequency

=500/800 =0.625m

Answer:

Explanation:

I hope it helps

Reflecting telescopes use mirrors to focus light and are free from chromatic aberration, while refracting telescopes use lenses and suffer from this effect, which is why modern-day research telescopes are overwhelmingly reflecting telescopes.

Reflecting telescopes and refracting telescopes differ in their design and the way they gather and focus light.

Refracting telescopes use lenses to bend or refract light to form an image. Light enters the telescope through a large lens called the objective lens, which bends the light and focuses it to form an image at the eyepiece.

Refracting telescopes suffer from chromatic aberration, where different colors of light bend at slightly different angles, causing the image to be surrounded by a colored halo or blur.

Reflecting telescopes, on the other hand, use a concave mirror to reflect light and form an image.

The mirror gathers and focuses the light at a point where an eyepiece or camera can be placed to observe or capture the image.

Reflecting telescopes are free from chromatic aberration, making them preferred for research purposes.

Modern-day research telescopes are overwhelmingly reflecting telescopes for several reasons.

Firstly, reflecting telescopes can be made much larger than refracting telescopes, which allows them to gather more light and produce higher resolution images.

Secondly, reflecting telescopes are easier and cheaper to manufacture and maintain than refracting telescopes.

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Explanation:

The band of electromagnetic radiation that human eyes can detect. This ranges from wavelengths of approximately 400 to approximately 700 nanometers (nm).

Explanation:

It's the portion of the electromagnetic spectrum that is visible to the human eye.

A cyclist provides himself the necessary centripetal force by leaning inward on a horizontal track, while going round a curve.

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the energy released is greater than a chemical reaction

nuclear reaction: reaction of the nucleus of the atom

chemical reaction: reaction of the atoms

Explanation:

a) Velocity and acceleration of a car are parallel when the car is moving along a straight line in the same direction. For example, when a car is gaining speed as it moves forward in a straight line, both velocity and acceleration are directed in the same direction.

b) Velocity and acceleration of a car are anti-parallel when the car is moving along a straight line in the opposite direction. For example, when a car slows down while moving in a straight line, its acceleration is directed opposite to the direction of its velocity, or the other way around.

Answer:

a)

There is only one case where velocity and acceleration are parallel only when they are moving in the same direction.

b)

There are 3 cases where velocity and acceleration are antiparallel.

(i) When both are moving in different direction

   It means :

(ii) When the object is slowing down, where velocity and acceleration are in the opposite direction.

(iii) In case of motion reversal.

Explanation:

When you ride your bike around a corner at 10 m/s, you are accelerating. Acceleration is caused by any forces. Sliding friction keeps you in the seat when a car goes around a corner. If you throw a ball into the air, Earth exerts a force on the ball.

Answer:

yes because acceleration is a vector quantity and as u turn around a corner you are changing direction.

Explanation:

A wave experiences reflection, refraction, Doppler effect, diffraction, and it can undergo both constructive and  destructive interference.

A wave can be defined as a disturbance in a medium that progressively transports energy from its source to another location, without transporting matter.

In Physics, there are two main (2) types of wave and these are;

Basically, some of the phenomenon and properties associated with waves include the following:

I. Doppler shift (Doppler effect).

II. Reflection.

III. Refraction.

IV. Diffraction.

V. Constructive interference.

VI. Destructive interference.

In conclusion, all waveform can be Doppler shifted, reflected, refracted,  diffracted, and can undergo constructive and  destructive interference.

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Answer:

Assuming they're unit vectors (length of 1)

You simply add them together.

The vector pointing right can be described with X and Y

(1, 0).

The vector pointing down

(0, -1).

The numbers are taken from the axis in X and Y directions.

If you add them together you get a final vector.

(1, - 1)

This gives you -45° pointing South East.

Or 360°-45°=315°

Answer:

H = 6 atoms

K= 2 atoms

O = 2 atoms

Answer:

H is 6 atoms K is2 atoms and O is 2 atoms

Explanation:

With 4.3 m/s velocity, is the cheetah running.

velocity= distance/time

distance=27.6 m

time=6.3 s

velocity=27.6 m/6.3 s

velocity=4.3 m/s

A vector number known as velocity describes "the pace at which an item changes its location." Imagine a person moving quickly, taking one stride ahead, one step back, and then beginning from the same place each time. A vector quantity is velocity. As a result, velocity is aware of direction. One must consider direction while calculating an object's velocity. Saying that an item has a velocity of 55 miles per hour is insufficient. The direction must be included in order to adequately characterize the object's velocity. Simply said, the velocity vector's direction corresponds to the motion of an item.

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Question :-

Answer :-

Explanation :-

As per the provided information in the given question, we have been given that the Current of the Device is 3.0 Ampere . The Resistance is given as 6.0 Ohm's . And, we have been asked to calculate the Potential Difference .

As we know ,

Where ,

Therefore , by Substituting the given values in the above Formula :-

\( \sf {\dag \: \: \: Potential \: Difference \: = \: Current \: \times \: Resistance} \)

\( \sf {\Longrightarrow \: \: \: \sf Potential \: Difference \: = \: 3.0 \: \times \: 6.0} \)

\( \sf {\Longrightarrow \: \: \: \sf Potential \: Difference \: = \: 3 \: \times \: 6} \)

\( \bf {\Longrightarrow \: \: \: \bf {Potential \: Difference \: = \: 18 \: }} \)

Hence :-

\( \underline {\rule {210pt}{4pt}} \)

Additional Information :-

\( \Longrightarrow \: \: \: \sf {Voltage \: = \: Current \: \times \: Resistance} \)

\(\Longrightarrow \: \: \: \sf {Current \: = \: \dfrac {Voltage}{Resistance} } \)

\(\Longrightarrow \: \: \: \sf {Resistance \: = \: \dfrac {Voltage}{Current} } \)

\( \underline {\rule {210pt}{4pt}} \)

Note :-

Q1. The main cause of surface subsidence is water withdrawal.This is option C

Q2. The statement "Subsidence is just restricted to a few areas worldwide" is False. This is option B

Q3. Evaporation from reservoirs is a source of water loss that is not often considered

This is option A

Q1. Surface subsidence refers to the sinking of land due to human activities, and one of the main causes of it is water withdrawal. Over-pumping of underground aquifers causes subsidence of the earth's surface, which can have severe consequences such as increased risk of flooding, infrastructure damage, and other problems.

Q2. Subsidence is not restricted to a few areas worldwide. Subsidence occurs in many areas around the world, especially in areas where large amounts of water are extracted from underground sources, such as in California and the Middle East. It is a global issue that affects the livelihoods of millions of people.

Q3. Evaporation from reservoirs is a source of water loss that is not often considered. Although agriculture and industrial/domestic consumption are major causes of water loss, evaporation from reservoirs is also a significant issue.

During hot and dry seasons, water stored in reservoirs evaporates, resulting in significant water loss. This can have a major impact on water availability for irrigation and other uses.

So, the correct answer to the question 1, 2 and 3 are C, B and A. respectively.

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The largest producer of primary air pollution in the United States is what? electricity producing plants.

Answer:

electricity production

Explanation:

Answer:

hi i only dont understand want ur saying

Hooke's Law states that the force exerted by a spring is directly proportional to the displacement from its equilibrium position.

To determine the amount by which the mass stretches the spring from its normal equilibrium position, we need to consider Hooke's Law. Hooke's Law states that the force exerted by a spring is directly proportional to the displacement from its equilibrium position.
The formula for Hooke's Law is: F = -kx
Where:
- F is the force exerted by the spring,
- k is the spring constant, and
- x is the displacement from the equilibrium position.
Since the system is at rest, the force exerted by the spring is balanced by the force of gravity acting on the mass.
The force of gravity is given by: Fgravity = m * g
Where:
- m is the mass of the object, and
- g is the acceleration due to gravity.
Since the mass is in equilibrium, the force exerted by the spring is equal to the force of gravity. Therefore, we can equate the two equations:
-kx = m * g
Now, we can solve for x, the displacement:
x = -(m * g) / k
Given that the acceleration due to gravity is 9.8 m/s², and the spring constant (k) and mass (m) are not provided, we cannot calculate the exact displacement without these values. However, using the provided information, you can substitute the given values into the equation to find the displacement.

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Answer:

The smallest particle in a chemical element or compound is called a molecule. Molecules are composed of atoms bonded together by chemical bonds. The sharing or exchange of electrons between atoms forms these bonds. Two hydrogen atoms are an example of a molecule.

Answer:

C

Explanation:

Hope this helps!

The average force the air exerted on the box as it fell is approximately 23.2N.

The formula is F = 0.5*Cd*p*A*v², where F is the force of air resistance, Cd is the drag coefficient of the object, p is the density of air, A is the cross-sectional area of the object, and v is the velocity of the object.

In this case, we can assume that the box is a simple rectangular shape with a cross-sectional area of 0.1m² and a drag coefficient of 1.0 (a conservative estimate for a box-shaped object). We also know that the density of air is approximately 1.2kg/m³.

Using the formula, we can calculate the force of air resistance on the box when it reaches its maximum velocity, which is likely close to the end of its fall. The maximum velocity can be estimated using the equation v² = u² + 2as, where u is the initial velocity (0), a is the acceleration due to gravity (9.8m/s²), and s is the distance fallen (20m). Solving for v, we get v = 19.8m/s.

Plugging in these values, we get:
F = 0.5*1.0*1.2*0.1*19.8²
F = 23.2N

Therefore, the average force the air exerted on the box as it fell is approximately 23.2N.

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Answer:

The answer is electrons.

Answer:

V= 0.25L

Explanation:

Answer:

because the friction in the baloons and the magnetism make it like nuclear fision

Explanation:

The magnetic field and friction between the balloons when placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion.

Nuclear fusion is the process through which light elements interact to create heavier elements (up to iron). Significant amounts of energy are released when interacting nuclei are from elements with low atomic numbers, such as hydrogen (atomic number 1) or its isotopes deuterium and tritium.

Thermonuclear weapons, or hydrogen bombs, which were created in the decade immediately following World War II, were the first to utilize the tremendous energy potential of nuclear fusion.

There are two main categories of fusion reactions: those that maintain the ratio of protons to neutrons and those that convert protons to neutrons.

Therefore, the magnetic field and friction in the balloons when placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion.

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Answer:

A) the initial point all energy is elastic potential and the final point all energy is kinetic

B) a bar graph the two bars have the same height and the sum of their height is the initial energy

C) two bars, one for the  kinetic energy and the other for the gravitational potential energy.

Explanation:

A) For this exercise we must use the energy conservation relations

starting point. When the spring is compressed

        Em₀ = K_e = ½ k x²

end point, at the bottom of the loop

        Em_f = K = ½ m v²

energy is conserved

        Em₀ = Em_f

         ½ k x² = ½ m v²

         v = \(\sqrt{ \frac{k}{m} }\)   x

In a bar graph the initial point all energy is elastic potential and the final point all energy is kinetic

B) intermediate point in a quarter of the radius

In this case we use the lower part of the loop as the starting point and the quarter part of the bow as the end point.

        Em₀ = K

         Em_f = K + U = ½ m v² + m g R

in a bar graph the two bars have the same height and the sum of their height is the initial energy

C) End point highest part of the loop

   starting point, bottom of loop

         Emo = K = ½ m v₀²

from part A of the exercise we saw that it is equal to the elastic energy of the spring

    final point. Highest part of the loop

         Emf = K + U

         Em_f = ½ m \(v_{f}^2\) + mg (2R)

where R is the radius of the loop

         Em₀ = Em_f

        1/2 m v₀² = 1/2 m v_{f}^2+ mg 2R

        v₀² = v_f^2 + 4gR

In a bar graph there are two bars, one for the  kinetic energy and the other for the gravitational potential energy. The sum of the heights of these bars is the initial energy, so the energy is transformed but not created or destroyed in the process.