Work occurs when (2 points) an applied force results in movement of an object in the same direction as the applied force an object is subjected to balanced forces resulting in movement of the object the energy present is the result of the force acting on the object the movement of the object was caused by a force and is in the opposite direction of the force

Explanation:

Yes, there are differences in the shapes of position-time graphs for uniform acceleration and uniform deceleration in different directions. Let's consider each case separately:\(\hrulefill\)

(1) - Uniform acceleration towards the positive direction:

In this case, the object is moving in the positive direction with a constant acceleration. The displacement-time graph will typically be a curve that starts from an initial position and shows a steady increase in displacement over time. The shape of the graph will depend on the specific acceleration value.

(2) - Uniform acceleration towards the negative direction:

In this case, the object is moving in the negative direction with a constant acceleration. The displacement-time graph will also be a curve, but it will show a steady decrease in displacement over time.

(3) - Uniform deceleration towards the positive direction:

In this case, the object is initially moving in the positive direction but is slowing down with a constant deceleration. The displacement-time graph will be a curve that starts with a positive slope and gradually levels off.

(4) - Uniform deceleration towards the negative direction:

In this case, the object is initially moving in the negative direction but is slowing down with a constant deceleration. The displacement-time graph will be a curve that starts with a negative slope and gradually levels off.

Answer:

Hard water is formed when water percolates through deposits of limestone, chalk or gypsum which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

Explanation:

Hard water is formed when water percolates through deposits of limestone, chalk or gypsum which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

Answer:

Hard water indicates a high amount of minerals.

Explanation:

This most often occurs when natural water sources pass through mineral deposits such as limestone or chalk. The process leads to a relatively high level of calcium, iron, and magnesium.

The efficiency of motor is 90.58%.To determine the efficiency of the motor, we need to calculate the input power and the output power, and then divide the output power by the input power

The input power can be calculated using the formula:

Input Power = Voltage × Current

Given that the voltage is 230 V and the current is 24 A, we have:

Input Power = 230 V × 24 A

Input Power = 5520 W (or 5.52 kW)

The output power of the motor is given as 5 kW (since it is a 5 kW motor).

Now, we can calculate the efficiency:

Efficiency = (Output Power / Input Power) × 100%

Efficiency = (5 kW / 5.52 kW) × 100%

Efficiency ≈ 90.58%

Therefore, the efficiency of this motor is approximately 90.58%.

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Answer:

i know da way ese'

Explanation:

Answer:

Gravitational Potential Energy

Explanation:

Gravitational potential energy is energy an object possesses because of its position in a gravitational field  (Hyper Physics). The potential energy is the energy that is stored in an object due to its position relative to some zero position(Physics Classroom).

For a body held at a height (h), the gravitational potential energy is capable to do work once the object is released from the height (h)

Answer:

B.-80.35 J

i dont know the calculation

The correct statement is " A dry cell battery has magnetic properties.", The correct option is C.

A dry cell battery does generate its own magnetic field due to the flow of electric current through the battery.

The magnetic field is created by the movement of charged particles (electrons) within the battery. This magnetic field is relatively weak and is not typically strong enough to be used for practical applications outside of the battery itself.

So, the magnetic properties of the dry cell battery are important for understanding its behavior within an electrical circuit.

Therefore, The correct answer is option C.

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Answer:

This question is incomplete

Explanation:

This question is incomplete. However, what is described in the question is known as upthrust. Upthrust is an upward force on an object (in this case the wooden block) provided by the liquid (water) as a result of it displacing some of the liquid. Thus floating objects will normally displace some part of the liquid; making some part of it to be submerged in water.

The percentage of the submerged wooden block can be calculated as

length (in height) of the wood block submerged in water/total length (in height) of the wood × 100

The length L₂ for destructive interference is  L₂ = 22 m

A sound wave is a mechanical wave which carries sound energy from one point to another.

Since two point sources S₁ and S₂, Which are in phase and emit identical sound waves of wavelength 2.0 m: The length L₁ = 21 m. A listener stands at point P: Assume the amplitude of individual sound reaching at point P does not change, to find L₂, we need to know the path difference for destructive interference.

The path difference for destructive interference is given by ΔL = (n + 1)λ/2

where

Since we require the least intensity, we have the minimum interference. So, n = 0.

So, ΔL = (n + 1)λ/2

ΔL = (0 + 1)λ/2

L₂ - L₁ = λ/2

So, making L₂ subject of the formula, we have

L₂ = L₁ + λ/2

Given that

Substituting the values of the variables into the equation, we have that

L₂ = L₁ + λ/2

L₂ = 21 m + 2.0 m/2

L₂ = 21 m + 1 m

L₂ = 22 m

So, the length L₂ = 22 m

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The projectile left the ground at an angle of 67.4 degrees above the horizontal, if there was no air resistance.

First, let's find the time of flight. We can use the kinematic equation:

y = yo + voy*t + 0.5*a*t^2

where y is the maximum height (0.57 km), yo is the initial height (0 m), voy is the initial vertical velocity (unknown), a is the acceleration due to gravity (-9.81 m/s^2), and t is the time to reach the maximum height (unknown).

Plugging in the values and solving for t, we get:

0.57 km = 0 + voy*t + 0.5*(-9.81 m/s^2)*t^2

t = 12.19 seconds

Since the total time of flight is twice the time to reach the maximum height, we have:

total time of flight = 2*t = 24.38 seconds

Now we can use the range equation to find the initial velocity vector of the projectile:

x = vox*t

1500 m = vox*24.38 seconds

vox = 61.51 m/s

where x is the range and vox is the initial horizontal velocity.

Finally, we can use trigonometry to find the initial angle of projection, theta:

voy/vox = tan(theta)

voy = vox*tan(theta)

61.51 m/s*tan(theta) = (150 m/s)

theta = 67.4 degrees

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In a nuclear reaction, to calculate the amount of energy it will produce, you must know the difference between the total nuclear mass before and after the reaction.

option A is the correct answer.

Mass defect is the difference between the predicted mass and the actual mass of an atom's nucleus.

In this scenario the actual atomic mass is less than the predicted mass which is calculated by adding the masses of nucleons.

The mass defect represents the energy that was released when the nucleus of an atom is  formed.

The amount of energy released in a nuclear reaction is calculated as;

E = Δmc²

where;

The above equation is known as Einstein binding energy equation.

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The magnitude of the force P provided that the stress in the part AB is two times that of BC part is 0.8 kN.

The magnitude of the force P provided that the stress in the part AB is two times that of BC part is calculated as follows;

Take moment about the joint to determine the magnitude of the force along part BC.

120 kN x 750 mm  =  F x 1000 mm

F = ( 120 kN x 750 mm ) / ( 1000 mm )

F = 90 kN

Stress is given as force divided by area. The following equation can be used to determine the magnitude of force P.

Stress in AB = 2 times stress in BC

P/A₁  = 2F/A₂

where;

A₁ =  πd²/4  =  π(50 x 10⁻³)²/4

A₁ = 1.96 x 10⁻⁵ m²

A₂ = πd²/4  =  π(75 x 10⁻³)²/4

A₂ = 4.42 x 10⁻³ m²

P/A₁ = 2F/A₂

P = (2F x A₁) / (A₂)

P = (2 x 90 kN x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = (2 x 90,000 N x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = 798.2 N

P = 0.798 kN

P ≈ 0.8 kN

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Answer:

Explanation:

solar

The formula for the distance covered by a body moving with an initial velocity u and accelerating at a rate a for a time t is s = ut + ¹/₂at².

To derive the formula for the distance covered by a body moving with an initial velocity u and accelerating at a rate a for a time t, we can use the basic equations of motion.

The first equation of motion states that the final velocity v of a body after time t is given by:

v = u + at

where;

We can rearrange this equation to give:

at = v - u

The second equation of motion states that the distance s covered by a body in time t is given by:

s = ut + ¹/₂at²

Substituting for at from the first equation of motion, we get:

s = ut + ¹/₂(v - u)t

simplifying gives:

s = ut + ¹/₂vt - ¹/₂ut

s = ¹/₂(v + u)t

Substituting the expression for v from the first equation of motion, we have:

s = ¹/₂(u + at + u)t

simplifying gives:

s = ut + ¹/₂at²

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The power to stop the car with kinetic energy of a car is  \(8*10^{6} J\) as it travels along a horizontal road is  \(8*10^{5} watt\), option B

Kinetic energy can be seen as one that is been recorded when an object is able to move from a place , in a broad term we can say this is the energy that can be attributed to that of someone leaving a place and go to another place hence we can see it as the one in the motion.

The definition of energy as the "power to accomplish work" refers to the capacity to apply a force that moves an object. Even if the word is vague, it is clear what energy actually means: it is the force that causes objects to move. The two types  can be attributed to the one we know which are kinetic and potential energy.

\(Power \frac{Energy}{time}\)

\(Energy = 8*10^{6} J\)

\(time = 10 s\)

\(Power = \frac{8*10^{6} J}{10}\)

\(power = 8*10^{5} watt\)

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proper question;

The kinetic energy of a car is 8 × 106 J as it travels along a horizontal road. How much power is required to stop the car in 10 s? (A) zero joules (B) 8  105 J (C) 8  107 J (D)8  104 J (E) 8  106 J​

Answer:

The statement that the time of ascent of a projectile is equal to the time of descent is not generally true. In most cases, the time of ascent and descent will not be equal.

When a projectile is launched into the air, it follows a curved path known as a parabola. The motion of the projectile can be divided into two phases: the upward motion and the downward motion.

During the upward motion, the projectile is subject to the force of gravity, which acts in the opposite direction to the initial velocity. As a result, the projectile slows down and eventually comes to a stop at the highest point of its trajectory. At this point, the velocity of the projectile is zero.

During the downward motion, the projectile continues to be influenced by gravity, but now the force of gravity acts in the same direction as the initial velocity. This causes the projectile to accelerate as it falls back to the ground.

The key point here is that the time of ascent and descent will only be equal if the projectile reaches the same height on its way up and on its way down. This requires specific conditions, such as launching the projectile from and returning it to the same height, with no air resistance, and with a specific initial velocity and launch angle.

In practical scenarios, the time of ascent and descent will generally be different. Factors such as air resistance, the launch angle, and the initial velocity will all affect the time it takes for the projectile to reach its peak and return to the ground. Additionally, the projectile's final velocity before striking the ground will not necessarily be the negative of its initial velocity.

Therefore, it is incorrect to assume that the time of ascent and descent of a projectile are always equal.

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Answer:

Yes, the time of ascent of a projectile is indeed equal to the time of descent. This is because the only force acting on the projectile is gravity, which is a constant acceleration. This means that the projectile's velocity changes at the same rate in both directions, up and down.

Explanation:

In order to prove this mathematically, we can use the following equations:

\(\boxed{\bold{v = u + at}}\)

\(\boxed{\bold{s = ut + \frac{1}{2} at^2}}\)

where:

For the ascent, we know that the initial velocity is u and the final velocity is 0. We can solve for the time using the equation:

\(\boxed{\bold{t = \frac{(v-u)}{a}}}\)

which gives us:

\(\bold{t =\frac{ (0 - u) }{ -9.8 m/s^2}}\)

\(\bold{t =\frac{ (u) }{ -9.8 m/s^2}}\)

For the descent, we know that the initial velocity is 0 and the final velocity is u. We can solve for the time using the same equation:

\(\bold{t =\frac{ (v- u) }{ -9.8 m/s^2}}\)

which gives us:

\(\bold{t =\frac{ (u - 0) }{ -9.8 m/s^2}}\)

\(\bold{t =\frac{ (u) }{ -9.8 m/s^2}}\)

As you can see, the time for the ascent is equal to the time for the descent. This is because the only force acting on the projectile is gravity, which is a constant acceleration. This means that the projectile's velocity changes at the same rate in both directions, up and down.

As for your point about the body falling and accelerating from rest, this is true.

However, the acceleration is still the same, regardless of whether the body is moving up or down. This is because the acceleration due to gravity is constant.

Answer:

D.some of its potential energy is transformed into kinetic energy each time it falls.

Answer:

if I am correct you can mark me as brainliest

The physics behind the movement of electric charges between parallel plates is based on the principles of electrostatics. Electric charges are either positive or negative, and they are affected by electric fields.

Electric fields are created by a difference in electric potential, which is measured in volts. When a voltage is applied to a set of parallel plates, the charges within the plates will be affected by the electric field, and will move in response to it.

When a voltage is applied to a set of parallel plates, the positive charges in the plate connected to the positive voltage will be attracted to the negative voltage, while the negative charges in the plate connected to the negative voltage will be attracted to the positive voltage.

The movement of charges between the plates is also affected by the presence of any obstacles or resistances in the electric field, such as resistance in the wire. This can slow down the movement of charges and result in a decrease in the current flowing through the circuit.

In all, the movement of charges between electric parallel plates is the result of the electric field created by a difference in electric potential, and the movement of charges is called drift velocity. The movement is also affected by the presence of resistance.

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Answer:

A. estrogen

Explanation:

This is released in the female reproductive organ.

Forensic Entomology is the study of life cycles of insects that feed on the flesh of dead, to establish time of death and occasionally identify chemicals present in a person's body at time of death

The scientific study of the colonization of dead body by arthropods is called forensic entomology .

Larvae and adults feed on dry skin and hairs of corpse and arrive later in decomposition process : Carpet Beetles

Time since death : postmortem Interval.

Rove Beetles : Arrive a few hours after death and are active throughout decomposition process. They feed on larvae and other insects rather than the corpse itself.

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On a figure or object and in a short statement banner you can plan to use text in your political cartoon.

What exactly are political cartoons used for?

A drawing that offers a humorous or unfavorable opinion about particular political persons or occasions. The objective is to influence the audience to take a particular stance on a historical event. A political cartoon expresses the views of its artist. It has an effect on the brain of spectators. But more often than not, they are attempting to persuade you than to amuse you. An effective political cartoon tries to convince you to agree with the cartoonist's point of view while also provoking discussion about current events by making their image in your brain.

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Answer:

a

because the brake has friction so the car eventually comes to a stop

1. The purpose of the investigation was to study the relationship between the Sun, Earth, and Moon.

2. The bright part of the moon appears bright due to the reflection of sunlight.

Introduction: The purpose of the investigation was to study the relationship between the Sun, Earth, and Moon. By creating models of the three celestial bodies, we aimed to understand how their movements and positions influence the phases of the moon and eclipses.The bright part of the moon appears bright due to the reflection of sunlight. As sunlight hits the moon's surface, it bounces back and reflects into space. This reflected light is what we see as the bright part of the moon.

Experimental Methods: To create our model, we used a lamp to represent the Sun, a ball to represent the Earth, and a smaller ball to represent the Moon. We also used a ruler, tape, and a protractor to measure distances and angles.We created our model by placing the lamp at one end of a table, the Earth in the middle, and the Moon at the other end. We attached the Moon to a string and moved it around the Earth to simulate the Moon's orbit around the Earth.

Develop a Model: Our model consists of a lamp, a ball, and a smaller ball on a string. The lamp represents the Sun, the ball represents the Earth, and the smaller ball on the string represents the Moon. As the Moon moves around the Earth, it goes through phases, from a new moon to a full moon and back again.We used diagrams and pictures to label the components of our model and describe causal accounts for the phases of the moon and eclipses.

Use a Model: When the Moon is full, it is in a direct line with the Earth and the Sun. Using our model, we can predict that the Moon would be directly opposite the Sun in the sky during a full moon. A lunar eclipse does not occur every month when there is a full moon because the Moon's orbit around the Earth is tilted at an angle of about 5 degrees to the Earth's orbit around the Sun. Therefore, the Moon is not always in a direct line with the Earth and the Sun during a full moon, which is necessary for a lunar eclipse to occur.

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The acceleration of the sprinter is approximately 131,426 km/h^2.

To find the acceleration in km/h^2, we need to convert the units from meters per second (m/s) to kilometers per hour (km/h) and adjust the time units accordingly. Here's the step-by-step calculation:

1. Convert the final velocity from m/s to km/h:

  14 m/s * (3.6 km/h) / (1 m/s) = 50.4 km/h

2. Convert the time from seconds (s) to hours (h):

  1.38 s * (1 h) / (3600 s) = 0.0003833 h

3. Calculate the acceleration using the formula:

  Acceleration = (Final velocity - Initial velocity) / Time

Since the initial velocity is 0 m/s (rest), we have:

Acceleration = (50.4 km/h - 0 km/h) / 0.0003833 h

Acceleration = 131425.955 km/h^2

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While certain types of glass containers may be suitable for short-term storage of vinegar, it is generally recommended to use non-reactive materials, such as plastic or stainless steel, for long-term storage to avoid any potential chemical reactions or corrosion.

Vinegar is an acidic liquid that contains acetic acid. When vinegar comes into contact with certain types of glass, particularly those made of lead or other reactive materials, a chemical reaction can occur. This reaction can lead to the leaching of potentially harmful substances into the vinegar.

Glass containers made from specific types of glass, such as soda-lime glass, are generally safe for storing vinegar.

However, it is important to note that prolonged storage or exposure to vinegar can still cause the glass to corrode over time. This can result in the deterioration of the glass container, potentially leading to breakage or the release of glass fragments.

To avoid any potential issues, it is recommended to use containers made of non-reactive materials, such as food-grade plastic or stainless steel, for long-term storage of vinegar. These materials do not react with the acidic nature of vinegar and do not pose a risk of leaching harmful substances.

Additionally, it is important to store vinegar in a cool, dark place to maintain its quality and prevent spoilage. Exposure to light and heat can degrade the quality of vinegar over time.

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Answer:

Work = Mass * Gravity * Height and is measured in Joules. Imagine you find a 2 -Kg book on the floor and lift it 0.75 meters and put it on a table. Remember, that “force” is simply a push or a pull. If you lift 100 kg of mass 1-meter, you will have done 980 Joules of work.

Explanation:

The medium in which electromagnetic waves and mechanical waves travel is one of their primary distinctions. Light and other electromagnetic waves, including radio waves, can move through void space without the aid of a physical medium.

They may move through vacuum, air, or other materials and are made up of oscillating electric and magnetic fields. The propagation of mechanical waves, such as sound or water waves, on the other hand, depends on a physical medium.

To transport energy, they rely on particle interactions and displacements in the medium. Since mechanical waves need a physical medium to carry their energy, they cannot move through a vacuum.

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