And I need help with seven and eight only I will appreciate it

0.88m/s is the the acceleration when the girl is pulling the wagon at an angle of 36.9 degrees. She is pulling with a force of 50N and the boy is pushing with a force of 30N. The mass of the wagon and books together is 90kg.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

The given data :

Pushing force by boy =30N

pulling force by Girl=50N

Mass of wagon and books together= 90kg

angle of pulling =36.9 degree

so the acceleration will be=F/m

hence net force =30+50N=80N

a=80/90

a=0.88m/s

Hence, 0.88m/s is the the acceleration when the girl is pulling the wagon at an angle of 36.9 degrees. She is pulling with a force of 50N and the boy is pushing with a force of 30N. The mass of the wagon and books together is 90kg.

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Answer:

HP is power and power is related to work by

P = W / t       work / time

W = F * S        work = force * distance

F = M * a        force = mass * acceleration

Thus  

W = M * a * S from above

Since P = W / t     we must have

P = M * a * S / t

Also S / t = average velocity over distance S

P = M * a * v

Or P = (M v ) * a

and power delivered = momentum * acceleration

Checking units:

Joules / sec = mass * meters/sec * meters /sec^2

kg m^2 / sec^3 = kg m^2 / sec^3

Hello!

\(\large\boxed{\text{C. 7,350,000 J}}\)

Use the equation:

\(PE = mgh\)

Where:

m = mass of the object (kg)

g = acceleration due to gravity (≈9.8 m/s)

h = height above ground (m)

Plug the given values into the equation:

PE = 7500 · 9.8 · 100

PE = 7,350,000 Joules.

Answer:

MY friend has already described the purpose of projectile motion so I will quickly go through the uses of each equation ...

Explanation:

TIME OF FLIGHT = it is given as 2Usin tita/g...it is the total time taken to and fro...it is 2x of the time taken ....

TIME taken ..t= Usin tita / g.....is the time taken to reach the maximum height which is 1/2 the TOTALTIME OF FLIGHT GIVEN ABOVE ..

MAXIMUM HEIGHT: the maximum height is the height attained by the projectile when projected ...it is calculate using the formula = U^2 sin^2 tita / 2g

Range =Search Results

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An object launched into projectile motion will have an initial launch angle anywhere from 0 to 90 degrees. The range of an object, given the initial launch angle and initial velocity is found with: R=v2isin2θig R = v i 2 sin ⁡ 2 θ i g .

Answer:

your answer should be c

Answer:

D.the branch that deals with the relations of organisms to one another and to their physical surroundings

His third law dictates that in disposition, for every action (force), there is an equal and opposing reaction.

Newton's laws of motion are three fundamental classical mechanics laws that describe the relationship between an object's motion and the forces acting on it.

These laws are summarized as follows: Unless acted upon by a force, a body remains at rest or in motion at a constant speed in a straight line.

His third law states that in nature, for every action (force), there is an equal and opposite reaction.

When object A applies a force to object B, object B applies an equal and opposite force to object A. In other words, forces are the result of interactions.

Thus, this is the third law of motion by Newton.

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Answer:

It depends on 2 factors

the nature of the materials

the normal force.

Explanation:

It depends on 2 factors

the nature of the materials that are in friction and the treatment that they have followed. This factor is expressed by a numerical value called the coefficient of friction or friction.

the force exerted by one body on the other, that is, the normal force.

A) The maximum energy stored in the capacitor at any time during the current oscillations is 0.525 J.

B) The frequency at which the capacitor contains the amount of energy found in part A is 1.33 MHz.

The formula for the energy stored in a capacitor is E = (1/2) * C * V^2, where C is the capacitance and V is the voltage across the capacitor.

Since the L-C circuit is oscillating, the energy will be transferred back and forth between the inductor and capacitor. At the point where the current in the inductor is at its maximum, all the energy is stored in the capacitor.

Using the formula for the maximum current in an L-C circuit, which is I_max = V_max / sqrt(L/C), we can find the maximum voltage across the capacitor, which is V_max = I_max * sqrt(L/C) = 1.6 * sqrt(0.410/0.260*10^(-9)) = 103.8 V.

Plugging in the values of C and V_max into the formula for the energy stored in the capacitor, we get E_max = (1/2) * C * V_max^2 = 0.525 J, as found in part A.

To find the frequency at which the capacitor contains the amount of energy found in part A, we can use the formula for the resonant frequency of an L-C circuit, which is f = 1 / (2pisqrt(L*C)). Plugging in the values of L and C, we get f = 1.33 MHz.

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Despite their darkness, their lustrous dark fur coat can make them difficult, if not impossible, to spot. Panthers have small heads, powerful jaws, and emerald green eyes. Their hind legs are often larger and slightly longer than their front legs.

The ability to remain undetected is one of the main ways that panthers differ from other big cats. Panthers hunt at night since they are nocturnal.

Therefore, They can blend in with their surroundings thanks to their dark fur, and their keen eyesight and nose make it easier for them to find their prey.

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By Using Euler's method with two steps, we can find the approximate value of Y(2) is 2.125. , where Y is the solution of the initial value problem dy/dx = x - y, and Y(1) = 3.

Euler's method is defined as a numerical technique which is  used to approximate solutions into ordinary differential equations. The method includes dividing the interval of interest into smaller steps and thereafter approximating the solution at each step by using the derivative of the function.

In this case, we are given the initial value problem dy/dx = x - y, with the initial condition Y(1) = 3. To approximate Y(2) using Euler's method with two steps, we will divide the interval [1, 2] into two equal steps.

Step 1:

We start with the initial condition Y(1) = 3. Using the differential equation dy/dx = x - y, we can approximate the value of Y at the midpoint of the interval [1, 2].

Using the step size h = (2 - 1) / 2 = 0.5, we can calculate Y(1.5) as follows:

Y(1.5) ≈ Y(1) + h × (x - y) = 3 + 0.5 × (1.5 - 3) = 3 + 0.5 × (-1.5) = 2.25

Step 2:

Now, using the value of Y(1.5) as the new approximation, we calculate Y(2) using the same process:

Y(2) ≈ Y(1.5) + h × (x - y) = 2.25 + 0.5 × (2 - 2.25) = 2.25 + 0.5 × (-0.25) = 2.125

Thus,  by using Euler's method with two steps, the approximate value of Y(2) is 2.125.

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The complete question is

Use Euler's Method With Two Steps To Approximate Y(2), Where Y Is The Solution Of The Initial Value Problem: Dy : X − Y, Y(1) = 3

The relationship between wavelength, frequency, and photon energy is inverse. As the wavelength of a wave decreases, the frequency and photon energy increase, and vice versa.

Wavelength and Frequency: Wavelength (λ) and frequency (f) are inversely related. This means that as the wavelength increases, the frequency decreases, and as the wavelength decreases, the frequency increases. This relationship can be described by the equation:

λ = c/f

where c is the speed of light. This equation shows that the product of wavelength and frequency is always a constant (the speed of light).

Frequency and Photon Energy: The energy of a photon is directly proportional to its frequency. This relationship is described by the equation:

E = hf

where E is the energy of the photon, h is Planck's constant, and f is the frequency. According to this equation, as the frequency increases, the energy of the photon increases, and as the frequency decreases, the energy of the photon decreases.

Combining the Relationships: Since wavelength and frequency have an inverse relationship and frequency and photon energy have a direct relationship, it follows that wavelength and photon energy also have an inverse relationship. As the wavelength decreases, the frequency increases, and therefore, the photon energy increases. Conversely, as the wavelength increases, the frequency decreases, and the photon energy decreases.

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Answer:

The answer is D for plato users :)

Explanation:

The minimum value of the coefficient of static friction is 1.33.

To calculate the minimum value of the coefficient of static friction, we need to determine the force of static friction acting on the block. The force of static friction is equal to the force of gravity acting on the block (mg) multiplied by the coefficient of static friction (µs

m = 14.26kg

θ = 41°

g = 9.8 m/s²

The force of gravity acting on the block is given by the formula:

Fg = mg

where,

m =  (mass of the block)

g =  (acceleration due to gravity)

Fg = 14.26kg *9.8 m/s²

Fg = 139.75 N

The force of static friction can be found using the formula:

Fstatic = µs * N

where,

µs = coefficient of static friction (unknown)

N = Normal force acting on the block

The normal force acting on the block is equal to the force of gravity acting on the block perpendicular to the ramp.

N = mg * cos(θ)

where,

θ = 41 degrees (incline of the ramp)

N = 14.26kg * 9.8 m/s² * cos 41°

N = 105.47 N

So,

Fstatic = µs * (mg * cos(θ))

making µs subject of the formula and substituting already calculated vaues we get,

µs =      Fstatic

          (mg * cos(θ))

µs =    139.75 N

         105.47 N

µs = 1.33

This is the minimum value of the coefficient of static friction.

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Answer:

a) reactant

b) product

Explanation:

During a chemical reaction, the reactants interact among themselves in a specific temperature, pressure, pH, enzyme etc. Due to various intra and inter molecular and atomic interactions, the chemical bonds in the reactants break down. Formation of new chemical product is governed by the formation of new bond (ionic, covalent, hydrogen vander waal etc. )

Work done on a 1500kg elevator by its cable to lift it 40m at a constant speed is 592000N.

The work done by a force is calculated as the product of the force(F) and the displacement of the object on which the force is acted.

Work done = F×d

downward forces are weight of lift and frictional force

upward force is only tension of string.

T = Frictional force + Mg

Mg = 1500× 9.8 = 14700N

given frictional force is 100N

So, Tension in string = (100+ 14700) N

= 14800N

work done by tension in lifting = tension force ×

displacement of lift

= 14800 × 40

= 592000N.

hence, work done on a 1500 kg elevator by its cable to lift it 40m at a constant speed is 592000N.

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The force used to push the mower forward along the ground depends on the angle between the force exerted along the handle and the ground. Without knowing the angle, the force used to push the mower forward cannot be determined.

To determine the force actually being used to push the mower forward along the ground, we need to consider the angle between the force exerted along the handle and the direction of motion of the mower.

When using a push mower, the force exerted along the handle can be divided into two components: one that acts vertically (perpendicular to the ground) and one that acts horizontally (parallel to the ground). The vertical component of the force is responsible for balancing the weight of the mower, while the horizontal component is responsible for propelling the mower forward.

Assuming that the force exerted along the handle is applied at an angle of 0 degrees (parallel to the ground), the entire force of 187 N is directed horizontally, pushing the mower forward. In this case, the force used to push the mower forward along the ground would be 187 N.

However, in reality, the force exerted along the handle may not be perfectly parallel to the ground. Let's assume that the angle between the force and the ground is θ. In this case, we can find the horizontal component of the force (the force actually used to push the mower forward) by multiplying the total force by the cosine of the angle:

Force used to push forward = Total force × cos(θ)

Since we know the total force exerted along the handle is 187 N, we need the value of θ to determine the force used to push the mower forward. If you provide the angle or any additional information, I can help you calculate the exact force.

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Answer:

static electricity

Explanation:

Answer:

Water

Explanation:

There is one Oxygen Atom and two Hydrogen molecules. The molecule is Dihydrogen Monoxide, commonly known as water.

When an electron in a hydrogen atom jumps from n = 3 to n = 2, the frequency of the emitted electromagnetic radiation is approximately 19.65 x 10^7 H

To calculate the frequency of electromagnetic radiation emitted when an electron in a hydrogen atom jumps from energy level n = 3 to n = 2, you can use the Rydberg formula:

1/λ = R_H × (1/n_final^2 - 1/n_initial^2)

where λ is the wavelength of the radiation, R_H is the Rydberg constant for hydrogen (approximately 1.097 x 10^7 m^-1), and n_final and n_initial are the final and initial energy levels, respectively.

To find the frequency (f) of the radiation, you can use the equation:

f = c / λ

where c is the speed of light in a vacuum (approximately 3.00 x 10^8 m/s).

Given:

n_final = 2

n_initial = 3

Let's calculate the frequency:

Using the Rydberg formula:

1/λ = R_H × (1/n_final^2 - 1/n_initial^2)

1/λ = 1.097 x 10^7 m^-1 × (1/2^2 - 1/3^2)

1/λ = 1.097 x 10^7 m^-1 ×(1/4 - 1/9)

Calculating the result:

1/λ = 1.097 x 10^7 m^-1 × (9/36 - 4/36)

1/λ = 1.097 x 10^7 m^-1 × (5/36)

1/λ = 0.1526 x 10^7 m^-1

Now, let's calculate the frequency using the equation f = c / λ:

f = c / λ

f = (3.00 x 10^8 m/s) / (0.1526 x 10^7 m^-1)

f = 19.65 x 10^7 Hz

Therefore, when an electron in a hydrogen atom jumps from n = 3 to n = 2, the frequency of the emitted electromagnetic radiation is approximately 19.65 x 10^7 Hz.

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The valley or ravine landfill method utilizes "lifts" from the bottom up with depths usually of 6 to 8 feet.

This means that the landfill is built up in layers or lifts, with each layer being 6 to 8 feet deep. The waste is then compacted and covered with a layer of soil before the next lift is added. This method is used in valleys or ravines because it allows for the natural contours of the land to be used, minimizing the need for excavation and land disturbance. It also helps to contain the waste in a specific area, making it easier to manage and monitor. Overall, the valley or ravine landfill method is an efficient and environmentally responsible way to dispose of waste.

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Answer:

N133A

Explanation:black

The velocity of a 4.5 kg object when it is halfway towards the ground after being dropped from a height of 6.0 m and given the acceleration due to gravity as 9.80 m/s² is 9.9 m/s.

This can be derived using the formula:

v² = u² + 2as

where:

v is final velocity

u is initial velocity

a is acceleration

and s is distance traveled.

Initial velocity (u) = 0 m/s

Final velocity (v) = ?

Distance (s) = 6/2 = 3m (since it is halfway toward the ground)

Acceleration (a) = g = 9.80 m/s²v²

= 0 + 2(9.80 m/s²)(3 m)v²

= 58.8 m²/s²v = √58.8 m²/s²v = 7.67 m/s (approx. 7.7 m/s)

Therefore, the velocity of the 4.5 kg object when it is halfway towards the ground is 9.9 m/s (approx. 10 m/s).

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Answer:

Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. ... The amount of energy in matter can be measured with a thermometer.

Explanation:

Answer:

Matter either loses or absorbs energy when it changes state.

Clear question is;

An ideal gas is enclosed in a piston-cylinder apparatus with the piston being freely movable. Given that ΔE is positive and ΔH is negative following a process,

pick one

A) the system absorbs heat and expands during the process.

B) the system absorbs heat and contracts during the process.

C) the system loses heat and expands during the process.

D) the system loses heat and contracts during the process.

E) the system loses heat but neither expands nor contracts during the process.

Answer:

Option A is correct.

Explanation:

In thermodynamics, when the change in energy which is ΔE of a system is positive, it means that the system is undergoing an endothermic process. An endothermic process is simply one where heat is absorbed from the surroundings

Now, when change in enthalpy which is ΔH is negative, it means that it's an exothermic reaction. Exothermic means it releases heat to the surroundings. This means work is positive because the system does work on the surroundings. Thus it will expand.

So the correct answer is;

heat is absorbed from the surroundings and will expand during the process.

Answer:

The electron is a negatively charged particle found in the atoms of all the elements. The electrons are located outside the nucleus in an atom. An electron is usually represented by the symbol (e –). The mass of an electron is about the mass of a hydrogen atom.

Explanation:

A girl rides her cycle round a circular track of diameter 60 m. The track is banked at 15° to the horizontal. The coefficient of friction between the track and the tyres of the cycle is 0.25. Modelling the girl and her cycle as a particle of mass 60 kg moving in a horizontal circle, the minimum speed at which she can travel without slipping is 13.64 m/s.

To find the minimum speed at which the girl can travel without slipping, we need to consider the forces acting on her and her cycle as they move in a circular track.

The forces acting on the girl and her cycle are the gravitational force (mg), the normal force (N), and the frictional force (f). The frictional force provides the centripetal force necessary to keep the girl moving in a circular path.

The normal force can be resolved into two components: the vertical component (N⊥) and the horizontal component (N∥). The vertical component balances the gravitational force, while the horizontal component provides the centripetal force.

Mass of the girl and cycle (m) = 60 kg

Diameter of the circular track (d) = 60 m

Bank angle (θ) = 15 degrees

Coefficient of friction (μ) = 0.25

Find the normal force components:

N⊥ = mg cos(θ)

N∥ = mg sin(θ)

The frictional force:

f = μN⊥

The frictional force (f) provides the centripetal force required for circular motion:

f = m(v² / r)

Here, v is the velocity and r is the radius of the circular track. The radius is:

r = d / 2

Combining the equations, we have:

μN⊥ = m(v² / r)

Substituting the values we have:

μmg cos(θ) = m(v² / (d / 2))

v² = (μmg cos(θ) / m) * (d / 2)

v² = (μg cos(θ)) * (d / 2)

v = √((μg cos(θ)) * (d / 2))

v = √((0.25 * 9.8 * cos(15)) * (60 / 2))

v ≈ 13.64 m/s

Therefore, the minimum speed at which the girl can travel without slipping is approximately 13.64 m/s.

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Answer:

Explanation:

Sounds travel faster in object having high density proportion or matter. This is because particles vibrates and causing the other particle near to as well vibrate. Hence, when sound is moving from a higher dense medium like Water, the rate of traveling is high compare to it moving in air with less dense.

Answer:

Here's what I get  

Explanation:

When two waves meet, they interfere with each other.

1. Constructive interference

If the crests of the waves happen to line up, as in Fig. 1,  the amplitudes add up.

The crests become twice as high. The troughs also line up, so they become twice as deep.

We call this constructive interference.

2. Destructive interference

If the trough of one wave meets the crest of another, as in Fig. 2, the opposite happens.

The trough of one wave subtracts from the crest of the other, so the two waves cancel.

We call this effect destructive interference.