name three substances that could be added to the water to make the steel needle to sink​

Answer:

technician B is right

Explanation:

A liquid crystal screen works by the polarization of the molecules that make up the screen by a local electric field, to abalone there must be a light source in the traces pattern in such a way that when a part of the screen is polarized the light manages to come out and we see the image. The polarization of the liquid crystal is a very fast process, therefore Technician A's comment is incorrect.

Liquid crystal displays (LCDs) are generally small and excessive pressure can break the glass and damage the display.

From the previous clarifications, technician B is right

The best description of Deena's error is: A "The line for constant velocity is not horizontal; it is diagonal and slopes downward."

In Deena's chart, she correctly identifies that the line for constant acceleration is diagonal and straight. This means that the velocity of an object with constant acceleration changes at a constant rate over time.

She also correctly mentions that to find the displacement for this scenario, you need to subtract the area of the triangle (which represents the changing velocity) from the area of the rectangle under the line (which represents the constant velocity portion).

Deena incorrectly described the line for constant velocity as horizontal, while it should be a straight line with a downward slope.

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The total mechanical energy of the bicyclist is 1400 J, obtained by adding her potential energy of 720 J and kinetic energy of 680 J. The correct answer is option B.

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Explanation:

Hey there!

Given that 4kg ball struck by 12 N force.

So, we need acceleration.

Force = Mass × Acceleration

And, so

Acceleration = Force / Mass.

Acceleration = 12/4

Acceleration is equal to 3m/s² in SI units.

Hope it helps :)

Okay, let's break this down step-by-step using the information given and the graph provided:

1) The P wave was recorded at 10 minutes.

2) The S wave arrived 5 minutes after the P wave, at 15 minutes.

3) According to the graph, the P wave travels at a speed of about 5 km/s.

4) The S wave travels at a speed of 3 km/s, which is slower than the P wave.

5) To find the distance to the epicenter, we need to use the difference in travel time between the P and S waves, which is 5 minutes.

6) Since the P wave speed is 5 km/s, in 5 minutes it will travel a distance of 25 km (5 km/s * 5 min).

7) The S wave speed is 3 km/s, so in 5 minutes it will travel 15 km (3 km/s * 5 min).

8) Therefore, the total distance to the epicenter is 25 + 15 = 40 km.

9) So the distance between the recording device and the earthquake epicenter is 40 km.

Does this make sense? Let me know if you have any other questions! I can also re-explain anything if needed.

There are roughly 1500 Km between the earthquake's epicenter and the recording device.

Using the graph, the time difference between the P wave and the S wave corresponds to a distance on the vertical axis. The distance is given in kilometers, convert minutes to seconds before using the graph.

5 minutes is equal to 300 seconds (since there are 60 seconds in a minute). So, see the point on the graph that corresponds to a time difference of 300 seconds (or 5 minutes). This point is located at a distance of approximately 1500 km.

Therefore, the distance between the recording device and the epicenter of the earthquake is approximately 1500 km.

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Answer:

2.77 would be the answer for this

Answer:

16m/s

Explanation:

Mv=mv

5000x8=2500x v

V=5000x8/2500

V=40000/2500

= 16m/s

When an object is placed between two parallel plane mirrors, an infinite number of images are formed. This is because each mirror reflects multiple images of the object, and those images are reflected by the other mirror, resulting in a never-ending series of reflections.

However, the intensity of each image decreases as the number of reflections increases, and the images get closer and closer together. In practical applications, only a few images are usually visible due to the limited amount of light available and the decreasing intensity of the images. Plane mirrors are flat mirrors that reflect light in a predictable manner. They are commonly used in many different applications, such as in mirrors for personal grooming or as reflective surfaces in optical instruments.

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The formula for preventing a collision is involved recognize the hazard, Understanding the defense, and at last Act correctly, in time.

The formula for preventing a collision is called RUA, where R stands for  Recognize the hazard, Constantly check the street ahead of you, and check your mirrors. Think almost what may happen as distant in progress as possible. Never assume that an unsafe condition will have passed before you reach it. U stands for understanding the defense, There are particular ways to handle most hazardous situations on the street. When you anticipate a danger, you're able to review the circumstance in your mind and visualize your defense so that when the time comes, you are able to act rapidly sufficient to avoid an accident. The arrangement is key and the last A stands for Act correctly, Once you see the risk and choose a defense, act promptly. Never assume that the condition will clear up. The sooner you act the more time you may avoid an accident.

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The answer is False. A polarized material does not need to have a nonzero net electric charge. Polarization occurs when the positive and negative charges within a material are displaced relative to each other, creating an electric dipole moment.

This can happen in materials such as dielectrics or insulators, which do not conduct electricity. The net electric charge of a polarized material can still be zero, as the overall positive and negative charges remain balanced, but the charges are spatially separated. Polarization plays an important role in phenomena such as capacitance, dielectric constant, and polarization-induced electric fields.

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Answer:

0.14 is the friction coefficient.

Explanation:

The equation for the friction coefficient is friction coefficient = force/normal force. The force is 4N, and the normal force is 28N. 4/28=0.14.

a] negative charge it's e-

The value of inductance is approximately 9.47×10^-7 H.

To find the value of inductance, we need to use the formula for resonance frequency:
f = 1 / (2π√(LC))
where f is the resonance frequency, L is the inductance, and C is the capacitance.

We know the value of capacitance (C = 4.2×10−13f), so we can rearrange the formula to solve for inductance:
L = 1 / (4π^2f^2C)

Substituting the given value of capacitance and assuming a resonance frequency of 1 MHz (10^6 Hz) for simplicity, we get:
L = 1 / (4π^2(10^6)^2(4.2×10−13)) = 9.47×10^-7 H

Therefore, inductance is  9.47×10^-7 H.

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As a fish swims deeper into the ocean, the pressure on its body is:

b.increases

The pressure on the upper surface of the water is the lowest where there is not so much water as of little water pressure, along with a little atmospheric pressure, but if you go deep inside the water the pressure will increases. As on the lower surface of water, the pressure is highest due to heavy water pressure from upwards along with atmospheric pressure. So if a fish swims deeper into an ocean the water will exert more pressure than it is on the upper, to the body of the fish, so the pressure increases.

If the oscillation amplitude is 0.22m, from a 0.29kg harmonic oscillator which has a total of mechanical energy 3.6j, the oscillation frequency is 4.141Hz.

It is a number of oscillations in the one-time unit, says per second. For example, a pendulum that takes 0.5s to make one full oscillation has a frequency of 1 oscillation per 0.5s or 2 oscillations / second.

How to calculate the oscillation frequency?

mass (m) = 0.29kg

Total energy (E) = 3.6j

amplitude (x) = 0.22m

E = 1/2 k*x^2

k = 2*E / x^2

= 2 * 3.6 / 0.22^2

= 148.76 N/m

Frequency (v) = 1/2π √k/m

= 1/2*3.14 * √148.76 / 0.22

= 4.141Hz

Therefore, the oscillation frequency is 4.141Hz.

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Answer:

C

Explanation:

Answer:

1.4L

Explanation:

You basically divide 20 divided by 1.5

The distance away in which brick 2 will land from brick 1, given that it was given an horizontal velocity of 10 m/s is 30 m

The following data were obtained from the question:

The horizontal distance of brick 2 from brick 1 can be obtained as illustrated below:

s = ut

Inputting the given parameters, we have:

= 10 × 3

= 30 m

Thus, we can conclude that the distance in which brick 2 will land frm brick 1 is  30 m

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Electric field strength at (2.6m,1.7m) is 25.9 V/m

Therefore, the term E can be used to determine the electric field intensity at a place whose coordinates are (x,y) (x,y)

V=250 (V⋅m) /√(x²+y²),  

E = ∂V/∂x i + ∂V/∂y j

If I is a vector along the x axis, and j is a vector along the y axis, both of which are unit vectors because their magnitudes are one.

∂V/∂x = -250x

           (x²+y²)³²

         = (-250*2.6)/29.97

=>   -21.68

∂V/∂x = -250y

           (x²+y²)³²

         = (-250*1.7)/29.97

=>   -14.18

so E(2.1,3) = -21.68 i  -14.18 j

E=√(∂V/∂x i² + ∂V/∂y j²)

E= √(-21.68² + -14.18²)

E=√ (470+201)= 25.9

therefore, the electric field's strength at (2.6m,1.7m) =25.9 V/m

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Answer:

f = 2445 Hz

Explanation:

i did the quiz

The frequency that the driver (observer) detects is equal to 1008 Hz

Given the following data:

To calculate the frequency that the driver (observer) detects, we would apply Doppler's effect of sound waves:

Mathematically, Doppler's effect of sound waves is given by the formula:

\(F_o = \frac{V \;+ \;V_o}{V\; - \;V_s} F\)

Where:

Substituting the given parameters into the formula, we have;

\(F_o = \frac{343 \;+ \;20}{343\; - \;20} \times 900\\\\F_o = \frac{363}{323} \times 900\\\\F_o = 1.12 \times 900\\\\F_o =1008 \;Hz\)

Driver (observer) frequency = 1008 Hz

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Answer:

c

Explanation:

The electric potential energy of the charge is divided by 2.

To find the electric potential energy, the values given from the source of an electric field changes from 3 mm to 6 mm.

            The electric potential energy is the energy that is needed to move a charge against the electric field.

The energy can be calculated as Work and these energy can be calculated as a whole not only the charges.

Formula for electric potential energy,

         U = KQ²/r

where,

K is the constant, k =  9 × 10⁹

Substituting the values of q as the charges and then the distance can be,

U = KQ² / 3   and U = KQ² / 6

So that, the values can be divided by 2.

The unit of electric potential energy is Joule.

The distance can be from r to ∞.

Hence, Option B is the correct answer.

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The control group for the experiment is honey at room temperature.

In an experiment, the control group serves as a baseline or reference point against which the experimental groups are compared. In this case, the control group is honey at room temperature. It is the group in which no specific manipulation or alteration is applied to the variable of interest, which in this case is the temperature. By keeping one group at room temperature, the researchers can observe and compare the viscosity of honey at different temperatures to determine the effect of temperature on the flow of honey. The other experimental groups, such as honey at 75, honey at 20, and honey at 50, will be subjected to different temperature conditions to examine the variations in viscosity.

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Answer:

3.85 V

Explanation:

The potential difference between two points can be calculated using the following equation

Where E is the energy and Q is the charge. So, replacing E = 250 J and Q = 65 C, we get:

Therefore, the potential difference is 3.85 V

Answer:

There are following two activities which affect heart rate and respiratory rate.

1-Exercise

2-Hiking

Explanation:

when we are exercising or hiking our heart rate and respiratory rate affected. This is because during hiking and exercising our body may need three or four time your normal cardiac output. This is because our body consuming energy during the workout and our muscles needs more oxygen. To meet the need of energy and oxygen respiration rate become fast and heart rate also increase.

Answer:

C. Hawaiian

Explanation:

Ego's father and all male relatives in his generation have the same kin name. Ego's mother and all female relatives in her generation are referred to by the same kin term.

Similarly, all brothers and male cousins are linked by giving them the same kin term. Sisters and all female cousins are also referred to by the same term.  

Answer:

No:      (V2 - V1) / t = a

If the vector velocity of the object does not change during time t then there is no defined acceleration

1. a. A steel girder, still glowing as it is removed from its mold, would produce a **bright line spectrum**. This is because the intense heat causes the atoms in the steel to emit light at specific wavelengths. The high temperature excites the electrons in the atoms, and as they return to lower energy levels, they emit photons of specific energies, resulting in distinct bright lines in the spectrum.
b. Sunlight shining through our atmosphere (as seen from Earth's surface) would produce a **continuous spectrum**. The sunlight consists of a broad range of wavelengths, covering the entire visible spectrum. As it passes through Earth's atmosphere, which contains various gases, particles, and molecules, these components do not selectively absorb or emit specific wavelengths, resulting in a continuous distribution of colors in the spectrum.
c. The Orion Nebula, a hot, glowing cloud of thin gases, would exhibit an **emission line spectrum**. The gases in the nebula are energized by nearby stars, causing them to emit light at specific wavelengths characteristic of the elements present. The excited electrons in the gas atoms emit photons at discrete energies, creating bright lines in the spectrum corresponding to specific elements or molecular transitions.
2. Three regularities/trends observed in the planets of our solar system that support the solar nebula concept are:
a. **Orbital Plane Alignment**: Most planets orbit the Sun in a nearly flat plane known as the ecliptic. This alignment suggests that the planets formed from a rotating disk of gas and dust, as the rotation of the solar nebula would have caused material to flatten into a disk-shaped structure.
b. **Terrestrial and Jovian Planet Differences**: There is a clear distinction between the inner terrestrial planets (Mercury, Venus, Earth, and Mars) and the outer gas giant planets (Jupiter, Saturn, Uranus, and Neptune). The terrestrial planets are smaller, denser, and composed mainly of rocky material, while the gas giants are larger, less dense, and composed mostly of hydrogen and helium. This supports the idea that the solar nebula had different zones with varying compositions and temperatures, leading to the formation of different types of planets.
c. **Rocky Debris in Inner Solar System**: In the inner solar system, there are numerous rocky asteroids and comets, which are remnants from the early stages of planet formation. These bodies are predominantly found in the asteroid belt between Mars and Jupiter and the Kuiper Belt beyond Neptune. Their presence suggests that rocky material was abundant closer to the Sun, while the outer regions contained more gas and icy material.

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The correct answer is 78.4 N

The coefficient of friction is the measure of the amount of friction that exists between any two bodies.

Here, we are given,

Force = 196 N

Coefficient of Kinetic friction μ(k)= 0.4

Kinetic friction is directly proportional to the magnitude of force of friction and thus can be calculated as -

\(f_{k}\) = μ x N

\(f_{k}\) = 0.4 x 196

\(f_{k}\) = 78.4 N

Therefore, the magnitude of force of friction on normal force of 196 N and coefficient of kinetic friction 0.4 is 78.4 N.

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Answer:

V = IR

Explanation:

V = voltage

I = current

R = resistance

A net force is also exerting itself on the ball when it begins to fall back to the earth and eventually stops.

Thus, According to Newton's Second Law, an object must be accelerating, or changing speed from second to second, if a net force is operating on it. The soccer ball accelerates when you initially kick it and continues to accelerate as it slows down until it comes to a stop.

The total amount of forces exerted on an object is referred to as its net force.

The total force operating on an item, which may include a number of different forces, is known as the net force acting on the object. The item is not accelerating and is consequently moving at a constant speed if the net force sums to zero.

Thus, A net force is also exerting itself on the ball when it begins to fall back to the earth and eventually stops.

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