Gabe is designing a flashlight that uses a parabolic reflecting mirror and a light source. the shape of the mirror can be modeled by a parabola that opens upward with a diameter of 4 in. and a depth of 1 in. the vertex of the parabola is at the origin. where should gabe place the bulb to ensure a perfect beam of light? (0, 1) (0, 4) (1, 0) (4, 0)

Doppler's effect:

The Doppler effect states that the frequency of sound increases as it source approaches you and it decreases as the source turns away from you.

When the ambulance drives past you, the pitch of the siren is lower. This is due to the fact that the frequency of the wavelength decreases.

A higher pitch means frequency increases and a lower pitch means frequency decreases.

Therefore, the correct answer is option B. decreases

Answer:

Explanation:

The farther a celestial object (a mass in space) is from another, the less of a gravitational force that they have on each other.

If the jet comes to rest in 13.0 ss , the magnitude of the average acceleration is zero.

The magnitude of average acceleration can be determined by using the formula:
average acceleration = (change in velocity) / (change in time)

In this case, since the jet comes to rest, its initial velocity is zero. Therefore, the change in velocity is the final velocity.

The jet comes to rest in 13.0 seconds, we can substitute the values into the formula to calculate the magnitude of average acceleration.
average acceleration = (final velocity - initial velocity) / (change in time)

Since the initial velocity is zero, the formula simplifies to:
average acceleration = final velocity / (change in time)

As the jet comes to rest, the final velocity is also zero.

Therefore, the magnitude of the average acceleration is:
average acceleration = 0 / 13.0 seconds
average acceleration = 0 m/s²

So, the magnitude of the average acceleration is zero.

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Hence, work done over the particle is 26

According to the given information

Consider a particle that moves on the line segment from (1,0,0) to (3,4,2)

The objective is to find the work done by the force field \($F(x, y, z)=\langle y+z, x+z, x+y\rangle$\) on the particle.

The particle moves on the line segment joining the points (1,0,0) to (3,4,2).

Recall that the work done over the particle is given by the integral as follows:

\(W=\oint_C F \cdot d r\)

The curve C represents the line segment from the point (1,0,0) to (3,4,2).

Calculate the vector function which represents the segment such as,

\(& r(t)=\langle 1,0,0\rangle+t\langle 3-1,4-0,2-0\rangle \\\)

\(& r(t)=\langle 1,0,0\rangle+t\langle 2,4,2\rangle \\\)

\(& r(t)=\langle 1+2 t, 4 t, 2 t\rangle\)

The vector \($\vec{r}(t)=(1+2 t) \vec{i}+(4 t) \vec{j}+(2 t) \vec{k}$\)

Compare the above equation with \($\vec{r}(t)=x \vec{i}+y \vec{j}+z \vec{k}$\)

Evaluate the value of x, y, z by above equations.

x=1+2 t, y=4 t, z=2 t

Since, \($F(x, y, z)=\langle y+z, x+z, x+y\rangle$\)

Substitute the values of equation (2) to get,

\(x & =y+z \\\)

  \(& =4 t+2 t \\\)

  \(& =6 t \\\)

\(y & =x+z \\\)

  \(& =1+2 t+2 t \\\)

  \(& =1+4 t \\\)

\(z & =x+y \\\)

  \(& =1+2 t+4 t \\\)

  \(& =1+6 t\)

Find the derivate of the vector as,

\(d r(t)=(2 \vec{i}+4 \vec{j}+2 \vec{k}) d t\)

Here \($0 \leq t \leq 1$\)

Substitute the values in equation (1) as follows:

\(& \oint F \cdot d r=\int F(r(t)) \cdot r^{\prime}(t) d t \\\)

            \(& =\int_0^1 F(r(t)) \cdot r^{\prime}(t) d t \\\)

            \(& =\int_0^1((6 t) \vec{i}+(1+4 t) \vec{j}+(1+6 t) \vec{k}) \cdot(2 \vec{i}+4 \vec{j}+2 \vec{k}) d t \\\)

            \(& =\int_0^1(12 t+4+16 t+2+12 t) d t\)

            \(& =\int_0^1(40 t+6) d t \\\)

            \(& =\left(\frac{40 t^2}{2}+6 t\right)_0^1 \\\)

            \(& =\left(20 t^2+6 t\right)_0^1 \\\)

            \(& =26\)

Hence, work done over the particle is 26

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Miniature circuit breakers is called the developed form of fuse because MCBs are more sensitive to current than fuses. They immediately detect any abnormality and switch off the electrical circuit automatically. This prevents any permanent damage to electrical appliances and human beings

Answer:

Anaphase

Explanation:

This is because the spindle fibres have shortened and is pulling the chromatids towards the poles of the cell. The chromatids have also separated.

The cell division which is shown in the picture is anaphase. The correct option is C.

Meiosis is divided into two main phases, each with its own set of subphases:

1 Meiosis I:

a. Prophase I: This is the longest and most complex phase of meiosis. During this phase, homologous chromosomes pair up and form bivalents, and crossing over occurs between the homologous chromosomes. The nuclear envelope breaks down, and spindle fibers form from the centrioles at opposite poles of the cell.

b. Metaphase I: During this phase, the homologous chromosomes line up along the metaphase plate, with one chromosome from each homologous pair facing each pole of the cell.

c. Anaphase I: During this phase, the spindle fibers contract and pull the homologous chromosomes towards opposite poles of the cell.

d. Telophase I: During this phase, the chromosomes reach the poles of the cell and the nuclear envelope reforms around each set of chromosomes. The cell then undergoes cytokinesis, resulting in two daughter cells.

2. Meiosis II:

a. Prophase II: During this phase, the nuclear envelope breaks down, and spindle fibers form from the centrioles at opposite poles of the cell.

b. Metaphase II: During this phase, the chromosomes line up along the metaphase plate, with sister chromatids facing opposite poles of the cell.

c. Anaphase II: During this phase, the spindle fibers contract and pull the sister chromatids towards opposite poles of the cell.

d. Telophase II: During this phase, the chromosomes reach the poles of the cell and the nuclear envelope reforms around each set of chromosomes. The cell then undergoes cytokinesis, resulting in four haploid daughter cells.

Meiosis involves two rounds of chromosome segregation, resulting in four haploid daughter cells that are genetically distinct from the parent cell.

Therefore, The correct option is C i.e anaphase.

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The initial speed of the car with a length of the skid mark of about 64 m long and kinetic friction of 0.70 is 29.63 m/s.

A force that acts between moving surfaces is referred to as kinetic or sliding friction. It is the frictional force that prevents relative motion between surfaces in contact. The formula to calculate this kind of friction is, \(f _k =\mu_kN\) where uk is the coefficient of friction and N is the normal force.

Given the length of the skid mark (Δd) is 64 m and the coefficient of kinetic friction is 0.70. The final velocity vf is 0 because the car stops.

Let us assume the initial velocity vi, mass m,  and deceleration a. Then, the normal force acting on the car is N = mg. The kinetic friction will be,

\(f _k =\mu_kN\\f_k=\mu_kmg\)

Let's assume the only force acting on the system is kinetic friction, then friction force=ma. Solve this equation with the above equation,

\(\begin{aligned}ma&=\mu_kmg\\a&=\mu_kg\end{aligned}\)

Then, the initial speed is calculated as follows

\(\begin{aligned}v_f^2&=v_i^2-2a\Delta d\\0&=v_i^2-2\mu_kg\Delta d\\v_i^2&=\mathrm{2\times0.70\times9.80\;m/s^2\times64\;m}\\v_i^2&=\mathrm{878.08\;m^2/s^2}\\v_i&=\mathrm{29.63\;m/s}\end{aligned}\)

The answer is 29.63 m/s.

The complete question is -

Police investigators, examining the scene of an accident involving two cars, measured 64 m long skid marks on one of the cars, which nearly came to a stop before colliding. The coefficient of kinetic friction between rubber and the pavement is about 0.70. Estimate the initial speed of that car, assuming a level road.

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The graph showing F as a function of y shows that D, the cube will oscillate between y=0.05 m and y=0.09 m.

From the graph, the force exerted on the cube increases linearly as the cube is displaced upwards from its equilibrium position at y = 0.07 m. When the cube is displaced to y = 0.05 m, the net force is upward and greater than the weight of the cube. This causes the cube to accelerate upward.

As the cube moves upward, the force exerted by the water decreases until it is equal to the weight of the cube at y = 0.07 m. At this point, the net force on the cube is zero and the cube momentarily comes to rest. The cube then continues to move upward, but the force exerted by the water is now downward, causing the cube to slow down and eventually come to a stop at y = 0.09 m.

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The complete question is:

A 4.0 kg cube is placed in a container of water. A student observes that the cube floats while performing simple harmonic motion. The net force exerted on the cube F represents the sum of the force due to gravity and the force exerted on the cube by the water. A force probe is used to measure F as a function of the cube's distance y from the bottom of the container. The graph shows F as a function of y, where the positive direction is upward. Which of the following statements is correct about the motion of the cube if it is released from rest at a vertical position of y = 0.05 m?

A) The cube will have a constant upward acceleration of 2.0 m/s².

B) The cube will have a constant downward acceleration of 2.0 m/s²

C) The cube will travel upward with a changing. c acceleration until it comes to rest at a position of y= 0.07 m.

C) The cube will oscillate between y = 0.05 m and y = 0.09 m.

On the rod, the magnetic force of current flow is flowing in a -y direction.

Conventionally, an electric current flows in the direction that a positive charge would.As a result, the positive terminal of the battery receives less current in the external circuit than the negative terminal does.Electrons go from a negative potential to a positive potential, and vice versa.

Because of the high potential electron concentration at the positive terminal and the low potential electron concentration at the negative terminal, electric current flows. Current is calculated as the quantity of electrons passing across the cross section of a conductor in a second.

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Answer:

In the centre of a star, the temperature and pressure are so high that four protons can fuse to form helium, in a series of steps.  

Explanation:

\({ \qquad\qquad\huge\underline{{\sf Answer}}} \)

According to snells law :

\(\qquad \sf  \dashrightarrow \: n_1 ×sin \: i = n_2 \times sin \:r \)

[ n corresponds to the refracting index of a medium ]

now, as we know :

Now, let's proceed according to the formula ~

\(\qquad \sf  \dashrightarrow \: 1 \times \sin(40 \degree) = 1.33 \times \sin(r) \)

\(\qquad \sf  \dashrightarrow \: \sin(r) = \cfrac{1 \times sin \: r}{1.33} \)

[ sin 40° = 0.6428 ]

\(\qquad \sf  \dashrightarrow \: \sin(r) = \cfrac{0.6428}{1.33} \)

\(\qquad \sf  \dashrightarrow \: \sin(r) \approx \cfrac{1}{2} \)

\(\qquad \sf  \dashrightarrow \: r \approx 30 \degree\)

Hence, the angle of refraction is equal to 30°

Answer:

10:30am ........................

Answer:

maybe around 10:30 I would say

Answer:

If the bicycle went down the hill, because if you are at the top of the hill, that is potential energy, when you start going down, it is turned into kinetic energy. Makes sense?

Explanation:

Answer:

b

Explanation:

Answer:

Energy

Explanation:

Edge 2021

As part of his special theory of relativity, Einstein saw mass as a form of energy.

The theory of relativity as stated by Einstein stated that mass and energy are both interconvertible. This explains why energy is released when mass is lost.

Thus, as part of his special theory of relativity, Einstein saw mass as a form of energy.

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Answer:

The resultant momentum is 12.97 kg.m/s. Choice: c

Explanation:

Momentum

The momentum is a vector that measures the quantity of motion that an object has. It's also known by the term "mass in motion".

As a vector, it can be expressed by its rectangular components:

\(\vec p = p_x\mathbf{i}+p_y\mathbf{j}\)

The magnitude of the momentum is:

\(\mid \mid \vec p \mid \mid =\sqrt{p_x^2+p_y^2}\)

The object described has an x-component of:

px=8.5 Kg.m/s

And a y-component of:

py=9.8 Kg.m/s

Thus, the magnitude of the momentum is:

\(\mid \mid \vec p \mid \mid =\sqrt{8.5^2+9.8^2}\)

\(\mid \mid \vec p \mid \mid =\sqrt{72.25+96.04}\)

\(\mid \mid \vec p \mid \mid =\sqrt{168.29}\)

\(\mid \mid \vec p \mid \mid =12.97\)

The resultant momentum is 12.97 kg.m/s. Choice: c

In this experiment, rubbing a plastic bag against wool allowed electrons to move back and forth between the two, creating a negative charge on the bag. When the negatively charged bag was brought close to the neutral PAN, the bag's negative charge attracted the PAN's electrons, separating the two charges and leaving the PAN with a positive charge. On touching the pan the surplus positive charge was neutralized, creating a spark.

When the pan was brought up to the nose a slight jolt was felt and a crackling sound was heard. This resulted in the excess charge in the pan being carried through the air to the nearest conductor, the person holding the pan.

The spark and shock were easy to see in a dark environment as there was no ambient light to obstruct the view. The blow was more pronounced and distinct, and the spark appeared as a bluish glow.

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Answer:

transverse wave, motion in which all points on a wave oscillate along paths at right angles to the direction of the wave's advance. Surface ripples on water, seismic S (secondary) waves, and electromagnetic (e.g., radio and light) waves are examples of transverse waves.

i think it goes fall the down winter and then the other seasons

From 1859 to 1994, lacrosse was known as the only official national sport of Canada.

Lacrosse, a game with Indigenous origins, was declared the official national sport of Canada in 1859. It held this distinction until 1994. The sport has a rich history in Canada, with Indigenous communities playing it for centuries before European settlers arrived. Lacrosse symbolized a connection to Indigenous culture and traditions.

However, in 1994, the Canadian government recognized ice hockey as the official winter sport and lacrosse as the official summer sport. This change reflected the growing popularity and cultural significance of ice hockey in Canada while still acknowledging the historical importance of lacrosse.

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We apply positive electric charges to two little plastic spheres. The amount of the repelling force between them when they are separated depends on how charged each sphere is. In light of this, total value of all of the two was 7.4 x 10-7 C.

Charge, often referred to as electric control, electrical charge, and electrostatic charge, and denoted by the symbol q, is a property of a unit unit matter that expresses that degree to which it has much more and fewer protons than electrons.

Subatomic particles or matter particles serve as examples of different types of charges: The charge on a proton is positive. Negative charge is a property of electrons. Null charge exists in neutrons.

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Answer:

the ebergy

Explanation:

energy does it have if a miving object

Here are 3 alkali metals with physical and chemical similarity.

What is alkali metals?

Alkali metals are come from the fact that when these metals or their oxides dissolved in water.a basic solution results.

Three alkali metals -

1- hydrogen(H)

2-lithium(Li)

3-potassium(K)

Physical and chemical similarity of hydrogen -

-it is colourless and tasteless in nature.

-it is a combustible gas but not a supporter of combustion.

Physical and chemical similarity of lithium -

-it have a melting point of 180.54

-it is the lightest of all metals,with a density approximately half that of water.

Physical and chemical similarity of pottasium -

- this metal is soft and white with a silver lustre.

-it imparts a lavender colour to a flame, and it's vapour is green.

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Answer:

   L = 40 cm

Explanation:

A microscope is an optical instrument built by two lenses in such a way that the image of the first is formed within the distance of the other (eyepiece), so that the latter creates an enlarged virtual image of the object, for which the magnification of the microscope is the same to the multiplication of the magnification of each lens

    M = - L / f₀ (25 cm /\(f_{e}\))

where fo and fe are the focal lengths of the objective and eyepiece, 25 cm is the near vision distance and L is the length of the microscope

     L = - M f_{o} f_{e} / 25

let's calculate

     L = - (-100) 2 5/25

      L = 40 cm

Answer:

90.0

Explanation:

Because 78.8329 + 3.179=83.0119

83.0119 + 6.5263=89.5382 rounded up is 90.0000

Hope this helps have a awsome afternoon:)

Because using natural gas is less polluting than petroleum or coal.

Natural Gas is a cleaner fuel than these. Natural gas emits a third less carbon dioxide than coal and emits half less than oil when used for different purposes.
The benefits of using natural gases are:

1. Domestic availability

2. relatively low cost
3. burns efficiently

4. reliable

5. relatively safe

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Particle accelerators use electromagnetic fields to accelerate particles by exerting a force on them.

The magnetic field alone cannot increase a particle's velocity, but when combined with an electric field, it can

accelerate charged particles. This is because the magnetic field causes the particles to move in a circular path, while

the electric field provides the necessary energy to increase the speed of the particles as they move along this path.

Therefore, the electromagnetic field works by combining the effects of both the electric and magnetic fields to

accelerate particles in a controlled manner.

Particle accelerators work by utilizing both electric and magnetic fields to increase the energy of charged particles.

While it's true that magnetic fields alone cannot increase the velocity of a particle, they play an essential role in

controlling the particle's trajectory. On the other hand, electric fields are responsible for increasing the velocity of

charged particles.

Here's a step-by-step explanation of how particle accelerators work using electromagnetic fields:

1. Charged particles are introduced into the accelerator.

2. Electric fields provide the necessary force to accelerate the particles, increasing their velocity.

3. Magnetic fields guide and steer the particles along the desired path or into circular orbits.

4. As particles move through alternating electric fields, they continue to gain energy and increase their velocity.

5. When particles reach the desired energy level, they can be directed toward a target or collision point for experiments.

In summary, particle accelerators use electromagnetic fields to control and increase the velocity of charged particles. Electric fields accelerate the particles, while magnetic fields guide their trajectory.

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Energy is the capacity for doing work.