100 POINTS PLEASE HELP I NEED A GOOD GRADE DESPERATELY TO PASS!!!

Explanation:

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The focal length of the convex mirror is approximately -4.4 meters. The negative sign indicates that it's a convex mirror.

To find the focal length of a convex mirror given its magnification and object distance, we can use the mirror formula and magnification formula. The mirror formula is:

1/f = 1/v + 1/u

where f is the focal length, v is the image distance, and u is the object distance. The magnification formula is:

M = -v/u

First, we need to find the image distance (v) using the magnification formula:

0.55 = -v/(3.2 m)

Solving for v, we get:

v = -0.55 * (3.2 m) = -1.76 m

The negative sign indicates that the image is virtual and erect, which is a characteristic of convex mirrors.

Now, we can use the mirror formula to find the focal length (f):

1/f = 1/(-1.76 m) + 1/(3.2 m)

Combining the terms, we get:

1/f = (-1.76 + 3.2) / (3.2 * -1.76) = 1.44 / (-6.272) ≈ -0.23

Taking the reciprocal of both sides, we get the focal length:

f ≈ 1 / (-0.23) ≈ -4.35 m

Expressing the focal length with two significant figures, we have:

f ≈ -4.4 m

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With the use of the formula below, their initial angle of launch was 26.2°

A projectile is any object that is projected into the air which take a trajectory path.

Given that a catapult shoots an object 1.65m at an initial velocity 15m/s. It is in the air for 0.33s. Their initial angle of launch can be calculated by using the formula

h = usinФt - 1/2gt²

Where

Substitute all the parameters into the formula

1.65 = 15sinФ × 0.33 - 1/2 × 9.8 × 0.33²

1.65 = 4.95sinФ - 0.5336

Collect the like term

4.95SinФ = 1.65 + 0.5336

4.95SinФ = 2.184

SinФ = 2.184/4.95

SinФ = 0.4411

Ф = \(Sin^{-1}\)(0.4411)

Ф = 26.2°

Therefore, their initial angle of launch was 26.2°

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When light waves encounter a clear glass surface, some of the light is reflected and some is transmitted through the glass. The amount of light that is reflected depends on the angle of incidence and the refractive index of the glass.

Assuming the glass is in air, the fraction of light that is reflected from the first surface can be calculated using the Fresnel equations. For normal incidence (when the light is shining straight at the glass), the fraction of light reflected is given by:

R = ((n₁ - n₂)/(n₁ + n₂))²

where n₁ is the refractive index of air (approximately 1) and n₂ is the refractive index of the glass. For typical clear glass, n₂ is around 1.5.

Plugging these values into the equation, we find that the fraction of light reflected from the first surface is approximately 4%. Therefore, 96% of the light shining straight at the glass is transmitted through the first surface.

It's important to note that the light that is transmitted through the first surface can be partially reflected again at the second surface of the glass, leading to further losses due to reflection.

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The nonconservative work done on the boy, A boy with a mass of 71.2 kg has caught a wave, which gives him an initial speed of 1.6 m/s. He then falls 1.64 m and finishes with a speed of 8.51 m/s. We'll utilize the energy conservation law to calculate the nonconservative work done on him.

The boy's initial kinetic energy is given by 1/2 m v₁² = 1/2 (71.2 kg) (1.6 m/s)² = 91.03 J. The potential energy he has before dropping through a height of 1.64 m is mgh = (71.2 kg) (9.8 m/s²) (1.64 m) = 1151.9 J.When he reaches the bottom, his kinetic energy is 1/2 m v₂² = 1/2 (71.2 kg) (8.51 m/s)² = 2656.36 J.

As a result, the energy conservation law provides us with the following expression:Initial energy + work done on the system = Final energy W_nc = Ef - Ei - W_cW_nc = 2656.36 J - 91.03 J - 1151.9 JW_nc = 1413.43 JTo obtain the answer in kJ, we will convert the value to kilojoules by dividing it by 1000.W_nc = 1413.43 J = 1.41 kJTherefore, 1.41 kJ of nonconservative work was done on the boy.

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Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

f is the force

m is the mass

From the question

f = 24 N

m = 6 kg

We have

\(a = \frac{24}{6} = 4 \\ \)

We have the final answer as

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If air resistance is negligible and our toy dart cannon generates a maximum initial velocity of 2.78 metres per second, we can shoot a dart up to a maximum distance of 0.74 metres from the ground.

Velocity is a time-dependent measure of how quickly an object's position changes in relation to a frame of reference. The velocity of an object indicates both its direction and speed of motion. Final velocity is a vector quantity that describes the speed and direction of a moving body after it has reached its maximum acceleration. The relationship between two points in physical space is given by the formula R = v2 sin2 theta/g.

R(max) equals v2/g if theta is 45 degrees.

R = 2.7^2 / 9.8 = .74 m

R = v^2 sin 2 theta / g

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Responder:

3,37 m / s, + ve x - dirección

Explicación:

Utilizando la ley de conservación de la cantidad de movimiento expresada por la fórmula;

m1u1 + m2u2 = (m1 + m2) v

m1 y m2 son las masas de los objetos

u1 y u2 son sus velocidades iniciales

v es su velocidad común

Dado

m1 = 0,519 kg

u1 = 4,80 m / s

m2 = 0,220 kg

u2 = 0 m / s (cuerpo en reposo)

Necesario

Velocidad común v

Sustituir en la fórmula los valores dados;

0,519 (4,8) + 0,22 (0) = (0,519 + 0,220) v

2,4912 + 0 = 0,739 v

2,4912 = 0,739v

Dividir ambos lados por 0,739

2,4912 / 0,739 = 0,739 / 0,739

v = 3,37 m / s

Por lo tanto, la rapidez de ambas bolas después de la colisión es de 3.37 m.s hacia la dirección x positiva, ya que m1> m2 y la velocidad común es positiva.

Fractal curves or surfaces might be used in a graphical representation of physical phenomena that have similar shapes at multiple scales.

Fractals are self-similar patterns that repeat at different levels of magnification, making them useful in representing complex phenomena such as turbulence, erosion, and the branching patterns of trees and rivers. They are also commonly used in computer graphics and simulations.

The type of curves or surfaces that might be used in a graphical representation of physical phenomena that have similar shapes at multiple scales are called fractals. Fractals are self-similar patterns, meaning they have the same or similar shapes when viewed at different scales. These curves and surfaces can be used to model various natural phenomena, such as coastlines, mountains, and cloud formations, as well as in various scientific and mathematical applications.

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The acceleration of the car toward the cliff is 19.81m/s. Other part as well as the explanation of the question is discussed below.

To find the speed at which the car leaves the cliff, first we need to know how long it took to reach the ground. We do this with the equation Where the vertical position at a time , since we are looking for the moment when the car reaches the gound is the initial vertical position, in this case the height of the cliff  is gravitational acceleration: .

So replacing the known values and since we need the time, we clear for it At time  the car  reaches the ground, according to the problem at a horizontal distance from the base of the cliff of 100 to find the velocity we use where  is the horizontal distance at time  (in this case  and  ),  is the initial horizontal distance, we define the cliff as zero in horizontal distance so , and  is the velocity of the car when it rolled of the cliff.

Therefore, The initial velocity (when it rolled of the cliff) is 19.81m/s.

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Answer:

condensation, the process of changing from a gas to a liquid

The height i should go  from the surface of the earth so that my weight will be 300 N is 1.92×10⁷ m.

Height is the vertical distance between two points.

To calculate the height i will go i will go from the surface of the earth so that my weight will be 300 N, we use the formula below

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1 and solve for h

Hence, the height is 1.92×10⁷ m.

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Answer:

50 out of 100 (ik its right)

Answer:

57? 17? 7? 77? 37? 47? 87? 97? 27? 67?

Explanation:

id'k

Answer:

3200

Explanation:

Answer:

D

Explanation:

Answer: velocity is the study of how fast an object changes its place, or is displaced.

Explanation: An example would be how fast a basketball reaches the other side of a gym, the acceleration and speed are measured and calculated to find velocity

Answer:

F = 39.2 N   (hand force) and    N = 68.6 N (shoulder force)

Explanation:

In this exercise we must use the rotational and translational equilibrium conditions, we have several forces: the weight (W) of the pole applied at its geometric center, the load (w1) at one end, the shoulder support (N) 60 cm from the load and hand force (F) at the other end of the pole

Let's set the reference system at the fit point of the shoulder

     ∑ τ = 0

We will assume that the counterclockwise turns are positive

    w₁ 0.60 + W 0.1 + F₁ 0 - F 0.4 = 0

all distances are measured from the support of the man (x₀ = 0.60 m)

    F = (w₁ 0.60 + W 0.1) / 0.4

    F = (m₁ 0.6 + m 0.1) g / 0.4

let's calculate

    F = (2.6 0.6 + 0.4 0.1) 9.8 / 0.4

    F = 39.2 N

this is the force that the hand must exert to keep the system in balance

We apply the translational equilibrium condition

    -w₁ -W + N - F = 0

     N = w₁ + W + F

     N = (m₁ + m) g + F

let's calculate

     N = (2.6 + 0.4) 9.8 + 39.2

     N = 68.6 N

Answer:

hit it harder

Explanation:

Endicott Kendrick

The energy conversion that is taking place as the blades of the windmills rotate is known as kinetic energy conversion.

Kinetic energy is the energy of motion and it is created when a body moves. In the case of windmills, the blades capture the energy of the wind, which is converted into mechanical energy and then into electricity.
When the blades of the windmill rotate, the wind passes through them and transfers its kinetic energy to the blades. This kinetic energy is then converted into rotational energy and is used to turn the rotor inside the windmill. The rotor is connected to a generator, which converts the rotational energy into electrical energy. This electricity is then used to power various electrical systems.
In summary,  where the kinetic energy of the wind is converted into mechanical energy and then into electrical energy.

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Answer: The answer is: D) as the moon revolves around earth, the different amounts of the sunlit side faces earth.

Explanation: I have my ways ;>

Have a great day!

-Sunny

Reverberation can enhance sound quality, create decay, reduce clarity, and cause distortion.

Answer:

f = 1.18 x 10¹¹ Hz

Explanation:

The equation used to find frequency is:

f = c / w

In this form, "f" represents the frequency (Hz), "c" represents the speed of light (3.0 x 10⁸ m/s), and "w" represents the wavelength (m).

Since you have been given the value of the constant (c) and wavelength, you can substitute these values into the equation to find frequency.

f = c / w                                                      <---- Formula

f = (3.0 x 10⁸ m/s) / w                                 <---- Plug 3.0 x 10⁸ in "c"

f = (3.0 x 10⁸ m/s) / (2.55 x 10⁻³ m)            <---- Plug 2.55 x 10⁻³ in "w"

f = 1.18 x 10¹¹ Hz                                         <---- Divide

Answer:

decomposers break down waste to yield ammonia.

Explanation:

The nitrogen cycle is the process by which nitrogen circulates among the atmosphere, terrestrial, and marine ecosystems and is converted into multiple chemical forms through both biological and physical processes.

In the nitrogen cycle, decomposers do not break down waste to yield ammonia.

So, the option ''decomposers break down waste to yield ammonia'' is correct.

The two options that help explain why the rotation of a conducting loop between the poles of a magnet generates a potential difference are:

(A) The magnetic field changes its direction relative to the loop.

(D) The angle between the loop and the magnetic field changes.

In a simple generator, a conducting loop rotates between the poles of a magnet, resulting in the generation of a potential difference. Two factors contribute to this phenomenon.

Firstly, as the loop rotates, the magnetic field lines passing through it change their direction relative to the loop (option A). This change in the magnetic field induces a changing magnetic flux through the loop.

According to Faraday's law, this changing magnetic flux induces an electromotive force (EMF) or a potential difference across the loop. Secondly, as the loop rotates, the angle between the loop and the magnetic field changes (option D).

This change in angle alters the component of the magnetic field perpendicular to the loop, further contributing to the generation of a potential difference.

Together, these changes in the magnetic field and the angle between the loop and the magnetic field lead to the generation of a potential difference, enabling the functioning of the generator.

Therefore the correct options are (A) The magnetic field changes its direction relative to the loop and (D) The angle between the loop and the magnetic field changes.

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Answer:

C. it will increase in speed

Explanation:

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A 50g weight needs to be positioned 30cm to the right of the center of mass in order to balance the meter stick.

Due to the 100g weight's additional weight and distance from the center of mass, the meter stick's center of mass will move in the direction of that weight. The meter stick must be balanced by adding a 50g weight 30cm to the right of the center of mass. This is so that the meter stick may remain balanced, which requires that the product of the weight and the distance on either side of the center of mass be equal. A 50g weight placed 30cm to the right of the center of mass will balance the meter stick in this situation because (100g x 15cm) = (50g x 30cm).

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Answer:

0.89 m

Explanation:

The time it takes to land is:

0.51 m / (1.2 m/s) = 0.425 s

The distance it falls in that time is:

Δy = v₀ t + ½ at²

Δy = (0 m/s) (0.425 s) + ½ (9.8 m/s²) (0.425 s)²

Δy = 0.89 m

The position-time relation, on the other hand, can be denoted by the second equation of motion, s = \(ut + \frac{1}{2} (at^2)\)

The height is 0.89 m.

The time it takes to land is:

0.51 m / (1.2 m/s) = 0.425 s

The distance it falls in that time is:

d = v₀ t + ½ at²

d = (0 m/s) (0.425 s) + ½ (9.8 m/s²) (0.425 s)²

d = 0.89 m

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Answer:

It reveals that light is a wave

Explanation:

Diffraction is the property of a wave in which there is a bending of the wave about the corners of an obstacle or aperture into the geometrical shadow of the obstacle or aperture.

This simply implies that a wave bends or spreads out when it passes through openings. Since the light diffracts through small slits and diffraction has been shown to occur in water waves and sound waves, this property of diffraction can only be characteristic of a wave and thus, this evidence reveals that light is a wave.

Answer:

It shows that light can travel in different wavelengths.

Explanation:

Light is similar to a wave in the way that it travels in a straight line, but when it is passing through the slits, it diffracts due to this difference. Therefore, light refracts in the same way as a wave would, and it is a mode of transferring energy. The light travels in a way similar to a wave

During phase shift, the substance's molecules' average kinetic energy remains constant.

Simply put, molecules move more quickly as kinetic energy rises. Nevertheless, molecules change phases when potential energy rises. The molecule changes phases as a result of an increase in potential energy.

In a phase change, matter moves from one state to another either by gaining energy through heat and entering a more energetic state, or by losing energy through heat and entering a state with lower energy.

The energy supplied during phase change is only used to separate the molecules; none of it is used to boost the kinetic energy of the molecules. Therefore, since the molecules' kinetic energy is constant, its temperature won't increase.

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