pulls a wagon a distance of 32 meters the handle is above an angle of 20 degrees above horizontal if you pull on it with a force of 27 N what work is it

Answer:

The correct false statement is;

As the stone rises, its potential energy decreases

Explanation:

When the stone is thrown straight up into the air, the initial velocity, u, progressively decreases according to the following equation;

v = u - g·t

Where;

v = The final velocity

g = The acceleration due to gravity = 9.81 m/s²

t = The time taken

Therefore whereby, the kinetic energy. K.E. is given by the equation , K.E. = 1/2 × m × u², as u reduces, the kinetic energy reduces

However, the potential energy, P.E. is given as P.E. = m × g × h

Where;

h = Height

m = The mass of the stone

Therefore, as the stone rises, the potential energy increases.

The incorrect option about the student's claim is option B which is his

claim about alternating current being correct.

This is the type of electron flow which involves a periodic reversal in

direction and changes in magnitude in the circuit.

In a circiuit electrons from the negative terminal to the positive one and

his claim mis correct about direct current which makes his claim wrong.

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The go-cart did 12,500 joules of work during the 25 m sprint.

To find the distance the crate was lifted, we can use the formula for work:

Work = Force * Distance * Cos(θ)

Given:

Work = 150 J

Force = 20 N

Since the force and displacement are in the same direction (vertical direction), the angle between them, θ, is 0 degrees. Therefore, Cos(0) =

1.

Plugging in the values into the formula:

150 J = 20 N * Distance * 1

Distance = 150 J / (20 N * 1)

Distance = 7.5 meters

Therefore, the crate was lifted a distance of 7.5 meters.

To calculate the power used, we can use the formula:

Power = Work / Time

Given:

Force = 90 N

Distance = 30 m

Time = 10 s

First, calculate the work done:

Work = Force * Distance

Work = 90 N * 30 m

Work = 2700 J

Now, calculate the power:

Power = Work / Time

Power = 2700 J / 10 s

Power = 270 W

Therefore, the power used to push the box a distance of 30 m in 10 s is 270 watts.

To calculate the work done by the go-cart, we can use the formula:

Work = Force * Distance

Given:

Mass = 100 kg

Acceleration = 5 m/s^2

Distance = 25 m

First, calculate the force:

Force = Mass * Acceleration

Force = 100 kg * 5 m/s^2

Force = 500 N

Now, calculate the work:

Work = Force * Distance

Work = 500 N * 25 m

Work = 12,500 J

Therefore, the go-cart did 12,500 joules of work during the 25 m sprint.

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Answer:

once a week

Explanation:

once a week so answer B

Answer:

B-Once a week

Explanation:

You answer is B-Once a week

When a completely smooth ball is simply rolling on a perfectly flat surface, there is no resistance between the surface and the ball, hence the ball is not slowed by the friction.

Realize that work implies that the operating force—here, friction—cause relative motion between the bodies. This may seem counterintuitive (that is, force from friction would need to cause the ball to move sideways relative to whatever it is rolling on). In pure rolling, the ball rotates around an axis but does not translate with respect to its point of contact with the surface (in pure rolling that point of contact is instantaneously stationary).

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Answer:

The block that is dropped straight down will have the greatest speed before hitting the ground. This is because it has no initial horizontal velocity, so all of its potential energy is converted into kinetic energy as it falls. The other blocks have some initial horizontal velocity, so some of their potential energy is converted into kinetic energy in the horizontal direction. This means that they will have a lower speed when they hit the ground.

Explanation:

The potential energy of an object is given by the equation:

PE = mgh

KE = 1/2 mv^2

When an object is dropped, its potential energy is converted into kinetic energy. The equation for the conservation of energy can be used to express this relationship:

PE = KE

mgh = 1/2 mv^2

v^2 = 2gh

v = sqrt(2gh)

The velocity of an object that is dropped is directly proportional to the square root of the height from which it is dropped.

The blocks in the question are all dropped from the same height. However, the block that is dropped straight down has no initial horizontal velocity. The other blocks have some initial horizontal velocity. This means that the block that is dropped straight down will have a greater speed when it hits the ground than the other blocks.

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The time taken for the rocket to reach a speed of 2430m/s from rest is 27.0 seconds.

Motion is simply the change in position of an object over time.

From the First Equation of Motion;

v = u + at

Where v is final velocity, u is initial velocity, a is acceleration and t is time elapsed.

Given the data in the question;

To determine the time, substitute the given values into the formula above and solve for t.

v = u + at

2430m/s = 0 + ( 90m/s² × t )

2430m/s = 90m/s² × t

t = 2430m/s / 90m/s²

t = 27.0s

Therefore, the elapsed time is 27.0 seconds.

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A rocket launched with an acceleration of 90 m/s², and a final speed of 2430 m/s. So the time required to reach the final speed is 27 seconds.

The ratio of change in velocity to time is referred to as acceleration. It has a SI unit m/s² with dimension formula MLT⁻².

According to the question, the given values are,

Final velocity, v = 2430 m/s

Initial velocity, u = 0 m/s

The acceleration is given as, a = 90 m/s².

Use the equation of motion to find the time required to reach the final speed,

v = u + at

2430 = 0 + ( 90 × t )

2430 = 90 × t

t = 2430 / 90

t = 27.0 seconds.

Hence, the time taken to reach the final speed is 27 seconds.

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Answer:

F = 180 N

Explanation:

To find the required force you first calculate the angle of the ramp, by using the following relation:

\(sin\theta=\frac{2m}{5m}=0.4\\\\\theta=sin^{-1}(0.4)=23.57\°\)

Next, you use the Newton second law to know what is the x component (in a rotated coordinate system) of the gravitational force:

\(F_x=mgsin\theta\)

the required force must be, at least, the last force Fx. You know that the weight of the object is 490N = mg. Hence, you have:

\(F=F_x=(450N)sin(23.57\°)=180N\)

the required force is 180N

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TRANSLATION:

Para encontrar la fuerza requerida, primero calcule el ángulo de la rampa, utilizando la siguiente relación:

Luego, usa la segunda ley de Newton para saber cuál es el componente x (en un sistema de coordenadas girado) de la fuerza gravitacional:

la fuerza requerida debe ser, al menos, la última fuerza Fx. Sabes que el peso del objeto es 490N = mg. Por lo tanto, tienes:

The half life is the time taken for half the number of radioactive atoms originally present to remain. This is  the time that corresponds to exactly half of the original number of radioactive isotopes remaining in the system.

The half life is the time taken for half the number of radioactive atoms originally present to remain. We can plot the number of atoms against the time taken in a graph.

We can obtain the half life of the radioactive isotope from the graph by noting the time that corresponds to exactly half of the original number of radioactive isotopes remaining in the system.

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(i) Switch k1 is closed:

The current passing through the circuit is:  0.25 amps

R_total = R1 + R2 = 3 + 5 = 8 ohms

The current passing through the circuit is:

i = V / R_total = 2 / 8 = 0.25 amps

(ii) Switches k1 and k2 are closed:

The current passing through the circuit is: 1.07 amps

1/R_total = 1/R1 + 1/(R2 + R3) = 1/3 + 1/(5 + 0) = 8/15

R_total = 15/8 ohms

The current passing through the circuit is:

i = V / R_total = 2 / (15/8) = 1.07 amps

(iii) Switch k1 is open and k2 is closed:

The current passing through the circuit is: 1.07 amps

1/R_total = 1/R2 + 1/(R1 + R3) = 1/5 + 1/(3 + 0) = 1/5 + 1/3 = 8/15

R_total = 15/8 ohms

The current passing through the circuit is:

i = V / R_total = 2 / (15/8) = 1.07 amps

So the current passing through the circuit depends on which switches are closed, and can range from 0.25 amps to 1.07 amps.

What is current?

Crrent refers to the flow of electric charge through a conductor, such as a wire. It is measured in amperes (A) and is defined as the rate at which electric charge flows past a given point in a circuit. current is caused by the movement of charged particles, such as electrons or ions, through a conductor.

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The height reached by the two carts after collision is determined as 5.34 m.

Apply the principle of conservation of mechanical energy.

K.E = P.E

v = √2gh

v = √(2 x 9.8 x 12)

v = 15.34 m/s

Apply the principle of conservation of linear momentum for inelastic collision.

m₁u₁ + m₂u₂ = v(m₁ + m₂)

8(15.34) + 4(0) = v(8 + 4)

122.72 = 12v

v = 10.23 m/s

Apply the principle of conservation of mechanical energy.

P.E = K.E

mgh = ¹/₂mv²

h = v²/(2g)

h = (10.23²) / (2 x 9.8)

h = 5.34 m

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The minimum compression of the spring needed to keep the block from falling is  0.0074 m and the minimum compression of the spring needed to keep the block from falling will increase if the mass of the block of wood is doubled.

A)The minimum compression of the spring needed to keep the block from falling is given by the expression,kΔx = mgsinθ + μmgcosθ

Here,m = 0.26 kg = 9.8 ms-2θ = 90° (since the block is pushed against a vertical wall)μ = 0.4 (coefficient of static friction between the block and the wall)k = 140 N/m

Therefore,140 Δx = 0.26 × 9.8 sin 90° + 0.4 × 0.26 × 9.8 cos 90°⇒ Δx = (0.26 × 9.8 × 0.4)/140⇒ Δx = 0.0074 m

Therefore, the minimum compression of the spring needed to keep the block from falling is 0.0074 m.

B) Doubling the mass of the block of wood will affect the minimum compression of the spring needed to keep it from falling.

Since the gravitational force acting on the block increases when the mass is doubled, the spring will need to be compressed more to balance the weight. Therefore, the minimum compression of the spring needed to keep the block from falling will increase if the mass of the block of wood is doubled.

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Answer:

On real life example of a scenario that takes advantage of the inverse relationship between force and time when impulse is constant is when making a serve with a lawn tennis racket

How It is an example of impulse is that when a serve is made by moving the bat slowly, the lawn tennis player uses less force and the ball is in contact with the string for longer a period

When however, the lawn tennis player moves the racket faster, with the strings of the racket highly tensioned  he uses more force and the ball also spends less time on the racket to produce the same momentum

Explanation:

The impulse of a force, ΔP is given by the following formula;

ΔP = F × Δt

Where ΔP is constant, we have;

F ∝ 1/Δt

Therefore, for the same impulse, when the force is increased, the time of contact is decreases and vice versa.

Answer:

The answer is below

Explanation:

Given that f(x) = x√3.

A function can be vertically stretched or compressed by multiplying it by a positive constant. If the constant is greater than 1, it is vertically stretched and if the constant is less than 1 it is vertically compressed.

If a function f(x) = x is compressed or stretched by a constant a, then the new function g(x) = a f(x)

If a function f(x) = x is translated a units down, then the new function g(x) =  f(x) - a

If a function f(x) = x is translated a units left, then the new function g(x) =  f(x-a)

If f(x) = x√3 is compressed vertically by a factor of 1/3. The new function is

\(f(x)'=x\sqrt{3} *\frac{1}{3} \\\\f(x)'=\frac{x}{3} \sqrt{3}\)

If it is then translated 3 units left and 7 units down, the transformed function g(x) is:

\(g(x)=(\frac{x-3}{3}\sqrt{3} )-7\)

A substance could have physical characteristics and chemical ones too, which are unique to the certain substance.

Color, odor, and how hard the substance, are all examples of physical characteristics of a substance.

Toxicity, flammability, and acidity, are all examples of chemical characteristics of a substance.

Answer:

Electronics (mainly), discovery of quantum mechanics, transistors, element properties, etc.

Explanation:

Great question. I think that it's widely agreed upon that the existence of handheld gadgets, as well as most electronics such as these, came from the advent of quantum mechanics (QM). Quantum mechanics allowed us to look at the behavior of electrons, as they are different from everyday objects. You can think of QM at the interface of chemistry and physics. Quantum mechanics is important, considering it predicts how electrons have to flow through your phone. This was especially helpful in determining their behavior regarding solid materials like the ones that make up your phone. Also, there are several materials that go into a phone, among these certain elements, such as silicon (a semiconductor) and copper/silver, which are great at conducting electrons. Eventually we started using things called transistors, which can amplify and switch electronic signals when needed. These can thought to be a direct product of QM. There are also all kinds of diodes and things that can emit light, among other things.

Also, you have to get the electricity from somewhere, and that can come from a controlled chemical reaction that you can charge right in your phone! That is basically what a battery does, it converts chemical energy (using chemical reactions) into electrical energy that powers your phone. So in short, electronics, chemistry of materials (governed by physics) and especially understanding of how electrons work with tiny transistors in your phone come together to even show you this answer. Wow.

Answer:

Non- examples will include processes that are not involving earthquakes or tectonic plates movements.

Explanation:

Seismology is the scientific study of earthquakes and internal structure of the earth. This study involves geographical distributions , origins, the effects and possible predictions of earthquakes. Seismology study can further include the  movement of Earth's tectonic plates.

Example of seismology is geological surveying.

Answer:

Mass is to gram

Explanation:

A star must be at least 3,437.75 parsecs away to have a parallax that is visible to the human eye.

The parallax of a star is a measure of the shift in its apparent position due to the observer's change in location. If a star has a parallax that is visible to the human eye, its parallax angle must be greater than 1 arcminute.

The parallax angle can be related to the distance to the star using the formula:

parallax angle (in arcseconds) = 206,265 * (distance to star in parsecs)^(-1)

Rearranging this formula to solve for the distance to the star, we get:

distance to star (in parsecs) = 206,265 * (parallax angle in arcseconds)^(-1)

Setting the parallax angle equal to 1 arcminute (which is equal to 60 arcseconds), we get:

distance to star (in parsecs) = 206,265 * (60)^(-1) = 206,265 / 60 = 3,437.75

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The amplitude of the magnetic field of the electromagnetic wave is 6.53 x 10^-7 T.

To find the amplitude of the magnetic field of an electromagnetic wave, we need to use the relationship between the electric and magnetic fields in an electromagnetic wave.

According to this relationship, the amplitude of the magnetic field is equal to the amplitude of the electric field divided by the speed of light (c). Therefore, if the amplitude of the electric field of an electromagnetic wave is 196 V/m, the amplitude of the magnetic field can be calculated as follows:

Amplitude of magnetic field = Amplitude of electric field / Speed of light
Amplitude of magnetic field = 196 V/m / 3 x 10^8 m/s
Amplitude of magnetic field = 6.53 x 10^-7 T

It is important to note that the amplitude of the magnetic field and the electric field of an electromagnetic wave are perpendicular to each other and are responsible for the wave's propagation through space.

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The length of the wave when A wave passes a point 5 times in one second and is traveling at 2560m/s is 512 m

To determine the length of a wave, we can use the equation:

wavelength = velocity / frequency

where wavelength is the distance between successive crests or troughs of the wave, velocity is the speed at which the wave travels, and frequency is the number of cycles of the wave that pass a given point in a given time period.

In this case, the wave passes a point 5 times in one second and is traveling at 2560 m/s. Substituting these values into the wavelength equation, we get:

wavelength = 2560 m/s / 5

= 512 m

Thus, the length of the wave is 512 m. This is the distance between successive crests or troughs of the wave.

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Answer:

Its angular acceleration is zero.

Explanation:

If the angular velocity of an object (in this case the toy) is constant, then its angular acceleration will be zero. Why? Because angular acceleration is the time rate change of angular velocity. Since there is no change, this brings the answer to zero.

Answer:

D

Explanation:

Hey you said this one would give 100 points.

Answer:

Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself.

Answer: They give  you a portion of the thing its fighting so it gets your cells use to it so they can fight it off easily

Explanation:

Answer:

B Newton's second law

Explanation:

An empty grocery cart is easier to move because there is less mass in an empty cart compared to a full cart. Newton's second law state that an object's acceleration depends on the mass of the object and the force applied.

Answer:

D

Explanation:

Trees are obviously effected from deforestation.

Pollution effects the things trees need to grow (water, air).

Reduction removes parts of the tree, some parts being needed.

Answer: D

Explanation:Trees are obviously effected from deforestation.

Pollution effects the things trees need to grow (water, air).

Reduction removes parts of the tree, some parts being needed.

The bulk modulus of the liquid is K=1.33×10 ³

The liquid that weighs heavier is denser if you weigh two liquids with similar volumes or amounts. A substance that is less dense than water will float if it is gently introduced to the water's surface. You follow the same procedure as you would for a solid to determine the density of a liquid. Determine the fluid's volume, mass it, and then divide mass by volume.

ρ=1300kg/m³

n=400Hz,λ=8.00m,

the velocity of wave  v=nλ,

v=400×8.00=3200m/s

v= K/ρ , .....................eq1

3200= K/1300

or   3200×3200=K/1300 ,

or   K=1.33×10 ³

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Answer:

Acceleration is the rate at which an object changes its velocity.  an object is said to be in acceleration if there is a chang in its velocity.

Explanation:

i hope this helped a lot

if it did then pls mark brainliest

pls and thank you!!

Answer:

v = 20.31 m/s

Explanation:

p = mv -> v = p/m = 32,500 kg*m/s / 1,600 kg = 20.31 m/s