Describe the purpose and use of the talk test.
I

The reactants have a higher potential energy and energy is released.

The potential energy graph shows a plot of the progress of a reaction. The hump on the graph is the activation energy of the reaction.

The statement that best describes the  total energy change of the system is that; reactants have a higher potential energy and energy is released.

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Superman must apply a horizontal force of 2918.5 N to the boulder to give it a horizontal acceleration of 13.0 m/s^2.

We can use Newton's second law, which states that force equals mass times acceleration. In this case, the mass of the boulder is not given, so we cannot directly calculate the force. However, we know that weight is equal to mass times the acceleration due to gravity (9.8 m/s^2), so we can use this relationship to determine the mass of the boulder.

\(2200 N = m * 9.8 m/s^2\\\Solving for mass, we get:\\\m = 224.5 kg\)

We can use Newton's second law to find the horizontal force:

\(F = m * a = 224.5 kg * 13.0 m/s^{2 }= 2918.5 N\)

Therefore, Superman must apply a horizontal force of 2918.5 N to the boulder to give it a horizontal acceleration of 13.0 m/s^2.

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Answer:

Doppler Effect refers to the change in wave frequency during the relative motion between a wave source and its observer

Explanation:

Like when a sound object moves towards you, the frequency of the sound waves increases, leading to a higher pitch.

The question is asking whether it is possible to find a magnetic vector potential for a given uniform surface current flowing in the xy plane and generating a magnetic field for different regions of space.

To determine whether it is possible to find a magnetic vector potential for the given scenario, we need to consider the conditions that must be satisfied. In general, a magnetic vector potential A can be found if the magnetic field B satisfies the condition ∇ × A = B. This is known as the magnetic vector potential equation.

In the given situation, the magnetic field is different for the regions above and below the xy plane. For z > 0, the magnetic field is described as B = MoK -î, and for z < 0, it is described as B = -MoK -î. To find the magnetic vector potential, we need to determine if there exists a vector potential A that satisfies the equation ∇ × A = B in each region.

By calculating the curl of A, we can check if it matches the given magnetic field expressions. If the curl of A matches the magnetic field expressions for both regions, then it is possible to find a magnetic vector potential for the given scenario. However, if the curl of A does not match the magnetic field expressions, then it is not possible to find a magnetic vector potential that satisfies the conditions.

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Answer:

1600 N

Explanation:

pascals principle says..

\(\frac{A_{out}}{A_{in}} = \frac{F_{out}}{F_{in}} \\\)

so lets do

\(\frac{2}{4} = \frac{x}{3200}\)

so multiply one half (2/4 simplified) by 3200

1600 is equal to x

1600 N

YAAAAAAAAAAAAAAY

Answer:

D). Insulator —> semiconductor —> conductor—> superconductor

Explanation:

The sequence list of types of materials in order from least conducive to the most conductive is: the insulator, semiconductor, conductor, and superconductor. Conductors are materials where electric current can flow freely; whereas, in insulators, electric current cannot. Examples of conductors are metals and water. Examples of insulators are plastics, papers, and rubbers.

Answer:

ya its D

Explanation:

Answer:

3 m/s

Explanation:

distance (rise) over time (run) gives speed, that is velocity

it can be found using the gradient (m) formula

m=(y2-y1)/(x2-x1)

m=(15-3)/(4-0) =12/4=3 m/s

Answer:

3 m/s

Explanation:

.....as the answer for your question is 3m/s ..

THANK YOU..

The speed of the sports car at impact was 15 m/s.

To solve this problem, we can use the conservation of momentum and the work-energy principle. The momentum of the system of the two cars before the collision is zero since the SUV is at rest.

After the collision, the two cars move forward together as a single system and come to a stop, so the momentum of the system is also zero.

By conservation of momentum, the momentum of the sports car before the collision is equal in magnitude to the momentum of the two cars after the collision:

m_sports_car * v_sports_car = (m_sports_car + m_SUV) * 0

where m_sports_car and m_SUV are the masses of the sports car and SUV, respectively, and v_sports_car is the speed of the sports car before the collision.

Solving for v_sports_car, we get:

v_sports_car = 0 kg*m/s / 980 kg + 2300 kg = 0 m/s

This tells us that the two cars came to a complete stop after the collision. However, we also know that the cars skidded forward before stopping.

Using the work-energy principle, we can calculate the initial kinetic energy of the system and equate it to the work done by the frictional force in stopping the system:

1/2 * (m_sports_car + m_SUV) * v² = F_friction * d

where F_friction is the frictional force, d is the distance the cars skid, and v is the speed of the sports car before the collision.

Solving for v, we get:

v = sqrt(2 * F_friction * d / (m_sports_car + m_SUV))

We are given the coefficient of kinetic friction between the tires and the road, which allows us to calculate the frictional force:

F_friction = friction_coefficient * (m_sports_car + m_SUV) * g

where g is the acceleration due to gravity.

Plugging in the values and solving, we get:

v = sqrt(2 * 0.80 * (980 kg + 2300 kg) * 9.81 m/s² * 2.6 m / (980 kg + 2300 kg))

v ≈ 15 m/s

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Answer: OLEDs

Explanation:

The nanotechnology uses the surface of the carbon materials to generate the electricity. The evaporation of water on the surface of carbon materials helps in generation of electrical energy due to generation of thermal energy.

OLEDs can be defined as solid-state devices that comprises of organic molecules like carbon that will create electricity by exposing a surface for generation of thermal energy.

Answer:

c

Explanation:

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The pressure due to water at the bottom of the tank  is 200000 Pascal.

It is the ratio between the force being applied and the surface area being applied to. The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure.

Given parameters:

Depth of the tank = 25 meter.

Depth of water in the tank: d = 25×4/5 meter = 20 meter.

Density of water: ρ = 1000 kg/m³.

Acceleration due to gravity: g = 10 m/s².

Hence, the pressure due to water at the bottom of the tank

= depth of water (d) × density of water (ρ) × acceleration of the gravity (g)

=  20 meter × 1000 kg/m³ × 10 m/s²

= 200000 Newton/meter²

=200000 Pascal.

Hence, the pressure due to water at the bottom of the tank  is 200000 Pascal.

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They will each have equal but opposite velocity.

Momentum is how we measure mass that is in motion. Any moving object will have momentum. Under the law of physics, the object’s momentum equals mass times velocity. These two skaters have just pushed off against one another. One skater has twice the mass as the other. We know that skater 1 has a smaller mass and skater 2 has a larger mass than skater 1. It implies that the force of skater 2 will be greater than that of skater 1 since force (F) varies directly proportional to the mass of an object together with its acceleration. So, when these two skaters collide, skater 2 exerts a greater force than skater 1 and the velocity of skater 1 will be increased and greater as a result of the collision with skater 2.

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Answer:

B 23m/s

Explanation:

From the above information we get,

Initial velocity= 3m/s

Acceleration by gravity = 10 m/s2 (approx)

Time taken =2 seconds

v=u+at (First Equation Of Motion)

v= 3 + 10 × 2

v= 23 m/s

Van de Graaff generator transfers charge by electrostatic induction via a motorized belt carrying a positive charge across a charging comb at the base of the generator.

A Van de Graaff generator transfers charge by the process of electrostatic induction. The generator consists of a hollow metal sphere or dome mounted on a column or pedestal, with a rubber belt running from a motorized pulley at the base to an upper pulley mounted on top of the column.

The belt is made of a non-conductive material and carries a positive charge as it moves across a metal comb called the "charging comb" at the base of the generator.

As the belt moves, it picks up electrons from the metal comb, which leaves the comb with a positive charge. The belt then carries the positive charge to the top of the generator where it is deposited on the metal sphere or dome.

Electrons are also repelled from the metal dome, so the dome builds up a strong positive charge. If a conductive object is brought close to the generator, the positive charge on the dome will induce a negative charge on the object, and vice versa.

This is why Van de Graaff generators are often used for scientific experiments and demonstrations, as they can create very strong electrostatic fields.

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No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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The size of the magnetic force on the wire due to the applied magnetic field of 0.55 T pointing straight down is 0.55 N (to two significant figures).

The magnetic force on a current-carrying wire is given by the equation F = I * L * B * sinθ, where F is the magnetic force, I is current, L is the length of the wire, B is the magnetic field, and θ is the angle between the current and the magnetic field.

In this case, the wire is carrying a current of 12 A (as given in the previous question), the length of the wire is 0.5 m (also given in the previous question), and the magnetic field is 0.55 T (given in the current question). Since the wire is perpendicular to the magnetic field, sinθ is equal to 1.

Plugging in these values into the equation, we get F = 12 * 0.5 * 0.55 * 1 = 0.55 N, rounded to two significant figures. Therefore, the size of the magnetic force on the wire due to the applied magnetic field is 0.55 N.

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Answer:

Is a

Explanation:

Answer: the answer Is A. Maria checked her ice cube every half hour and forgot to reseal the container she put the ice cube in

Explanation: I just took the test

Answer:

A

Explanation:

APEX:)

Based on the graph, it appears that the species most likely to be affected if the water temperature increases from 74°F to 80°F would be the rainbow trout.

It is because the graph shows that rainbow trout have a much narrower range of temperature tolerance compared to the other species listed, such as bass and catfish. While bass and catfish can tolerate temperatures up to 90°F, rainbow trout can only tolerate temperatures up to around 68°F.

As the water temperature increases beyond 68°F, the health and survival of rainbow trout are likely to be negatively impacted, making them more vulnerable to the effects of increasing water temperature. Therefore, if the water temperature were to increase from 74°F to 80°F, it would be expected to have a significant impact on the population of rainbow trout in the ecosystem.

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Answer:

= 24.76m

= 2476 cm

Explanation:

18 meters from point of origin = 18m north 90 degrees?

17 meters from point of origin = 17m west 0 degrees?

                                                                                                        _

If these routes are one after the other then we get a triangle  |

18 side and 17 side

This means we need to do Pythagoras Theorem.

18^2 + 17^2 = c^2

sqrt 324 + sqrt 289 =  c^2

c^2 = sqrt 613 = 24.7588368

= 24.76m

Answer: B: Rehabilitation and is known to increase flexibility.

PNF stands for Proprioceptive Neuromuscular Facilitation, which is a type of stretching that involves the contraction and relaxation of muscles. It is commonly used in rehabilitation settings to improve range of motion, flexibility, and muscle strength.

your welcome (:

Answer:

This question is incomplete as it lacks the table that shows the advantages and disadvantages of the two mentioned nonrenewable source of energy (coal and ore). However, the question can be answered based on general understanding.

The answer is D. Ores must be processed.

Explanation:

Energy can be of two major sources namely: renewable and nonrenewable sources. Based on the mentioned area in this question, NONRENEWABLE SOURCES OF ENERGY are those sources of energy that cannot be replenished or replaced when exhausted. They are utilized faster than they form. Examples of nonrenewable sources of energy are coal, ores, fuel etc.

According to this question, Carlos listed some advantages and disadvantages of using nonrenewable resources. However, among the listed disadvantages, Carlo's error is that he included that: ORES MUST Be PROCESSED.

Ores are rock materials that contain metals, which are extracted and purified in a series of processing techniques. Hence, ORES NEED PROCESSING making Carlo's claim erroneous.

Answer:

Carlos listed some advantages and disadvantages of using nonrenewable resources.

Which best describes Carlos’s error?

Coal is not plentiful anywhere.

Coal generates very little energy.

Ores do not make many useful products.

Ores must be processed.

Explanation:

Answer:

I think is B. sound, nuclear, electrical

but if I wrong then I am so sorry

Answer:

72 N

Explanation:

Applying,

F = (m'+m)a..................... Equation 1

Where F = Force, m' = First mass, m = second mass, a = acceleration.

From the question,

m' = 2 kg, m = 4 kg, a = 12 m/s²

Substitute these values into equation 1

F = 12(2+4)

F = 12×6

F = 72 N

Answer:

Weigh is how much gravity pulls an object

Answer:=mgh

Explanation:

It is True. Motorcyclists should ride in the wheel tracks of the vehicle directly in front of them on wet roads.

This is because the water will be pooled between these tracks, leaving less water on the tire and allowing better contact with the road surface, which is important for maintaining traction, stability and control. True, motorcyclists should ride in the wheel tracks of the vehicle directly in front of them on wet roads. Motorcyclists should maintain a safe distance and speed from the vehicle in front of them to avoid collisions or accidents on the road. By doing this, the motorcycle will have a better grip on the wet surface of the road, which will help in maintaining control on the motorcycle.

When driving on wet roads, motorcyclists should ride in the wheel tracks of the vehicle directly in front of them. By doing this, the motorcycle has better contact with the road surface, which will help in maintaining traction, stability and control. It is important for motorcyclists to maintain a safe distance and speed from the vehicle in front of them to avoid any collisions or accidents on the road.

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The parcel of land measures approximately 0.0918 acres.

To determine the length of the racetrack in miles, we first convert the length from kilometers to feet:

1 km = 1000 m

1 m = 3.28084 ft

1 km = 1000 m * 3.28084 ft = 3280.84 ft

Next, we convert the length from feet to miles:

1 mile = 5280 ft

Length in miles = 3280.84 ft / 5280 ft = 0.621371 miles

Therefore, the length of the racetrack is approximately 0.621 miles.

To determine the number of acres in a parcel of land, we divide the area of the land in square feet by the area of an acre:

Area of land = 20 ft * 200 ft = 4000 ft²

Number of acres = 4000 ft² / 43,560 ft² = 0.0918 acres

Therefore, The parcel of land measures approximately 0.0918 acres.

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Answer:

A 'kink' in the glass tube which breaks the mercury as it contracts, storing the highest temperature reading. The glass tube is shaped like a lens to magnify the thin mercury thread. Shaking the thermometer resets the mercury back into the bulb.

Kink in the Mercury thermometer helps to prevents the falling of mercury present in capillary  tube into bulb. It ensures that the user takes the correct reading of temperature. That's the reason a person before taking a new reading must give a sudden shake to the clinical thermometer so that the mercury level comes to normal .