Ann is driving down a street at 60 km/h.
Suddenly a child runs into the street.
If it takes Ann 0.72 s to react and apply the
brakes, how far will she have moved before
she begins to slow down?
Answer in units of m.

Answer:

Biosphere

Explanation:

Plants release the biosphere into the atmostphere. :)

Answer:

C  For a 100% fact!!!!   :)

Answer:

I did C on edge and got this correct sooo

Explanation:

Motion occurs when there is a change in an object's position with respect to a reference point. This change can be caused by upsetting the equilibrium of the body, such as by applying a force to it or by changing its weight distribution.

Rotary motion occurs when an object rotates around an axis of rotation, while linear motion involves the transfer of motion to outside forces. Therefore, all of these conditions are necessary for motion to occur, whether it is in a straight line or in a circular path. Understanding the conditions for motion is essential in physics and engineering, where it is necessary to study how objects move and how to control their motion to achieve specific goals.
To have motion, all of the answers are correct (option d). This means that for an object to have motion:

a. The equilibrium of the body must be upset: When a force is applied to an object in equilibrium, it will disrupt the balance and cause the object to move.

b. Rotary motion must occur around the axis of rotation: In order for an object to have rotational motion, it must rotate around a specific axis.

c. Linear motion must be transferred to outside forces: When an object experiences linear motion, the forces acting upon it must be transferred to other objects or systems for the motion to occur.

In summary, motion can be achieved by upsetting the equilibrium of the body, having rotary motion around an axis of rotation, and transferring linear motion to outside forces.

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The two objects that have the same inertial frame of reference are The skier and the lift, option B.

A frame of reference that is inertial is one in which Newton's law is valid. That means a body will remain at rest or continue to move uniformly if there is no external force acting on it. Which is my inertial frame in this situation if a body is held on the surface of the earth? A body on the earth is at rest, but a body on the moon is in motion.

The phrase "inertial frame" is really relative, meaning that we initially consider a reference frame to be the inertial frame of reference. Therefore, a more inclusive definition of an inertial frame might be: An inertial frame is one that is stationary or travels at a constant speed relative to my presumptive inertial reference frame.

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Answer:

The inner planets (C)

Explanation:

I hope this helps and i got this answer right on my test!!!

Answer:

Explanation:

Technology has both positive and negative impacts on the environment. Here are some examples of each:

Positive impacts:

Increased energy efficiency: Advances in technology have led to the development of more energy-efficient appliances, vehicles, and industrial processes, reducing energy consumption and greenhouse gas emissions.

Renewable energy: Technology has enabled the development of renewable energy sources such as wind and solar power, reducing our dependence on fossil fuels and reducing the impact of energy production on the environment.

Improved waste management: Technological innovations have improved waste management practices, making it easier to recycle and reduce waste.

Enhanced communication and transportation: Technology has improved communication and transportation, making it easier to access information and resources, reducing the need for travel, and minimizing the environmental impact of transportation.

Negative impacts:

Resource depletion: Technology often requires the extraction and use of natural resources such as minerals, oil, and gas, leading to resource depletion and environmental degradation.

Electronic waste: The increasing use of electronic devices has led to a growing problem of electronic waste, which can contain toxic materials and harm the environment if not disposed of properly.

Climate change: Some technologies, such as fossil fuel-based energy production and transportation, contribute significantly to climate change through the release of greenhouse gases into the atmosphere.

Habitat destruction: The development of technology and infrastructure often requires the destruction of natural habitats, leading to the loss of biodiversity and disruption of ecosystems.

Overall, technology has the potential to have both positive and negative impacts on the environment, and it is important to consider these impacts when developing and using technology in a way that is sustainable and equitable.

Answer: The fork feels colder when you touch it because Steel conducts thermal energy better than plastic. The correct statement is 1

Explanation:

The ability of a material to transfer heat energy in an environment is known as thermal conductivity. It feels cooler to touch a steel spoon than a plastic spoon found in the same temperature because steel which is a type of metal is a highly efficient thermal conductor than spoon which is a plastic.

Metals can be defined as those substances which forms positive ion in a chemical reaction by lossing it's electrons. It has the following properties:

--> it is solid at room temperature

--> it has high melting point

--> it has high boiling point and

--> it is malleable.

Metals are said to be good thermal conductor because they contain free flowing conduction electrons. Therefore, when you touch a steel spoon and plastic spoon, it feels cooler because the steel metal is able to conduct heat away from your hand faster than the plastic which is a poor conductor of heat.

Answer:

1. Steel conducts thermal energy better than plastic.

Explanation:

Both objects are at the same temperature, and when you touch them, you feel the steel to be colder.

This happens because steel is a better thermal conductor, then when you touch it, it "steals" more thermal energy from you than the plastic.

As the amount of thermal energy transmitted is greater for the steel, you will feel it to be colder.

Then the correct option is the first one, steel conducts thermal energy better than plastic.

When one speaker is driven at 569 Hz and the other at 559 Hz, the beat frequency is 10 Hz and the average beat frequency is 564 Hz.

The beat frequency is equal to the difference between the two frequencies.

Beat frequency = \(569 Hz - 559 Hz = 10 Hz\)

So the beat frequency is 10 Hz.

The average frequency is equal to the sum of the two frequencies divided by two.

The average frequency is calculated as follows

Average frequency = \((569 Hz + 559 Hz) / 2 = 564 Hz\)

So the average frequency is 564 Hz.

Therefore, the beat frequency is 10 Hz while the average frequency is 564 Hz when one speaker is driven at 569 Hz and the other at 559 Hz.

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The following equation may be used to determine heat loss via a glass window: Q = k * A / (T1 - T2) where Q denotes heat loss The thermal conductivity of glass.

(in W/m.K) is given by k. A denotes the window's surface area (in m2). T1 is the temperature of the inner surface (in degrees Celsius). T2 is the temperature of the outer surface (in degrees Celsius).The following equation may be used to determine heat loss via a glass window: Q = k * A / (T1 - T2) where Q denotes heat loss The thermal conductivity of glass.  The thickness of the glass is denoted by d. When we plug in the values, we get: Q = 1.4 * (1 * 3) * (15 - 5) / 0.005 Q = 1.4 * 3 * 10 / 0.005 Q = 1.4 * 600 / 0.005 Q = 840 / 0.005 Q = 168000 W As a result, the heat loss through a 1 m 3 m glass window with a 5 mm thickness and a temperature differential is 10 °C is equal to 168000 W.

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If the velocity of the shock ahead of the projectile was 3 times the velocity of the projectile, we can calculate the velocity of the projectile by dividing the velocity of the shock wave by 3.

The speed of the normal shock proceeding down the barrel in front of the projectile can be determined using the equation for the normal shock wave speed, which is given by the square root of the ratio of specific heat capacities multiplied by the product of the pressure ratio and the temperature ratio.
To find the speed of the normal shock wave, we need to calculate the pressure and temperature ratios.

The pressure ratio is the ratio of the pressure behind the shock wave to the undisturbed pressure. In this case, the undisturbed pressure is given as 101 kPa.

The temperature ratio is the ratio of the temperature behind the shock wave to the undisturbed temperature. The undisturbed temperature is given as 300 K.

Since the problem does not provide any information about the pressure and temperature behind the shock wave, we cannot determine the speed of the normal shock wave in front of the projectile.

Regarding the pressure and temperature experienced by the front face of the projectile, we also do not have enough information to calculate them. Without knowing the specific properties of the projectile and the conditions in the barrel, we cannot determine the pressure and temperature at the front face of the projectile.

If the velocity of the shock ahead of the projectile was 3 times the velocity of the projectile, we can calculate the velocity of the projectile by dividing the velocity of the shock wave by 3.

In conclusion, due to the lack of information, we cannot determine the speed of the normal shock wave, or the pressure and temperature experienced by the front face of the projectile.

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Answer: A rotating body or system can be in equilibrium if its rate of rotation is constant and remains unchanged by the forces acting on it.

hope this helped

Answer:

Hai ví dụ như sau:

a) Vật thể chuyển động - Phương tiện di chuyển, Người đàn ông đi bộ

b) ở trạng thái nghỉ - Xe đứng, người ngồi

c) Chuyển động vì một vật đứng yên so với một vật khác - Một người đàn ông ngồi trên sân ga đứng yên so với đoàn tàu đang chuyển động, Một ô tô chuyển động ngang qua những ngôi nhà đang đứng yên

d) chuyển động thẳng - Đi bộ trên đường, chuyển động lên trên

e) chuyển động cong - Chạy trên đường tròn, đạn bắn ra từ súng

f) chuyển động tròn đều - Xe chuyển động trên đường cong, êlectron chuyển động vuông góc với từ trường đều

Explanation:

Hai ví dụ như sau:

a) Vật thể chuyển động - Phương tiện di chuyển, Người đàn ông đi bộ

b) ở trạng thái nghỉ - Xe đứng, người ngồi

c) Chuyển động vì một vật đứng yên so với một vật khác - Một người đàn ông ngồi trên sân ga đứng yên so với đoàn tàu đang chuyển động, Một ô tô chuyển động ngang qua những ngôi nhà đang đứng yên

d) chuyển động thẳng - Đi bộ trên đường, chuyển động lên trên

e) chuyển động cong - Chạy trên đường tròn, đạn bắn ra từ súng

f) chuyển động tròn đều - Xe chuyển động trên đường cong, êlectron chuyển động vuông góc với từ trường đều

Given the data from the question, the heat gained by the water, the rate of energy transfer and the initial temperature of the iron are:

A. The energy gained by the water is 37656 J

B. The average rate of energy transfer from

the iron sphere to the water is 125.52 J/s (Watts)

C. The initial temperature of the iron

sphere is 65.4° C

Q = MCΔT

Q = 3000 × 4.184 × 3

Q = 37656 J

Power = energy / time

Power = 37656 / 300

Power = 125.52 J/s (Watts)

Q = CT

37656 = 576 × T

Divide both side by 576

T = 37656 / 576

T = 65.4° C

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The initial speed of a shopping cart is 36 m/s.

What is acceleration?

Acceleration is the term used to describe how quickly a velocity's speed and direction change over time. It is said to have been accelerated when something changes its direction and moves faster or slower. Motion on a circle accelerates even when the speed is constant because the direction is constantly changing.

What is kinematic equation?

The set of equations known as the kinematic equations describes how an object moves with constant acceleration. Integrals, rates of change, and derivatives must be understood in order to solve kinematic equations.

List the known and unknown values.

u = initial velocity = 20 m/s

v = final velocity = ? m/s

a = acceleration = 4 m/s²

t = time interval = 4 s

s = displacement = ? m

The following kinematic equation should be used to determine the final velocity.

v = u + at

v = 20 m/s + (4 m/s² × 4 s) = 36 m/s

Now calculate the displacement using the following kinematic equation.

s = ut + ½at²

s = (20 m/s × 4 s) + (0.5 × 4 m/s² × (4 s)²)

s = 80 m + 32 m = 112 m

Therefore, the initial speed of a shopping cart is 36 m/s.

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At a depth of 500 meters in the mine, the estimated vertical stress is 13.5 MPa, and the estimated horizontal stress is 11.57 MPa. Specific details to consider are Chalk Strength, Chalk Permeability, Chalk Heterogeneity.

Before proceeding with the excavation of the cavern beneath the sea, the main geological information that would be important to have includes the properties and characteristics of the chalk formation. Some specific details to consider are:

a) Chalk Strength: It is essential to determine the strength and stability of the chalk formation to ensure that it can support the excavation without collapsing or experiencing excessive deformation. This would involve assessing parameters such as the cohesion, friction angle, and compressive strength of the chalk.

b) Chalk Permeability: Understanding the permeability of the chalk is crucial, especially since the cavern will be beneath the sea. The permeability will impact the water flow within the chalk and may affect stability, seepage, and potential groundwater inflow into the excavation.

c) Chalk Heterogeneity: Chalk formations can exhibit variations in their composition, including the presence of layers or discontinuities such as faults or joints. Understanding the geological structure and heterogeneity of the chalk will help in assessing the potential for rock mass instability, water ingress, or the presence of other geological hazards.

To estimate the vertical and horizontal in-situ stresses at a depth of 500 meters in the mine, we can use the principles of rock mechanics and consider the given parameters.

Vertical Stress:

The vertical stress is the stress component acting vertically downward due to the weight of the overlying rock. It can be calculated using the average unit weight of the rock and the depth.

Vertical Stress = Unit Weight of Rock × Depth

Vertical Stress = 27 kN/m³ × 500 m

Vertical Stress = 13,500 kN/m² or 13.5 MPa

Horizontal Stress:

The horizontal stress can be estimated using the in-situ stress ratio, which is influenced by Poisson's ratio. The relationship between the horizontal and vertical stresses can be expressed as:

Horizontal Stress = Vertical Stress × (2 × Poisson's Ratio) / (1 - Poisson's Ratio)

Horizontal Stress = 13.5 MPa × (2 × 0.3) / (1 - 0.3)

Horizontal Stress = 13.5 MPa × 0.6 / 0.7

Horizontal Stress = 11.57 MPa

Therefore, at a depth of 500 meters in the mine, the estimated vertical stress is 13.5 MPa, and the estimated horizontal stress is 11.57 MPa.

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Answer: Volcanoes and ridges are landforms that are created by the movement of tectonic plates.

Explanation:

Answer:

Volcanoes and ridges

Explanation: As the bottom plate is heated up by the Earth's hot mantle, a material called magma forms. It rises. Over time magma erupts through the plates. Many such volcanoes are found on "the Pacific Ring of Fire."

The desired level of motor unit recruitment and force of muscle contraction without causing harm to the muscle tissue.

The amplitude or voltage of an electrical signal used to stimulate a muscle is a critical factor in determining the level of motor unit recruitment and the force of muscle contraction.

Motor units are groups of muscle fibers innervated by a single motor neuron. The number of motor units that are recruited during a muscle contraction determines the force generated by the muscle. When a small number of motor units are recruited, the force generated is relatively small. However, as more motor units are recruited, the force generated increases. The recruitment of motor units follows the "size principle", which states that smaller motor units are recruited first, followed by larger motor units as the force required increases.

The amplitude or voltage of an electrical signal applied to a muscle determines the number of motor units that are recruited. A low amplitude or voltage signal will only recruit a small number of motor units, resulting in a weak muscle contraction. As the amplitude or voltage of the signal increases, more motor units are recruited, resulting in a stronger muscle contraction.

However, there is a limit to the number of motor units that can be recruited by an electrical signal. Once all available motor units are recruited, further increases in amplitude or voltage will not produce any additional force. Additionally, excessively high amplitude or voltage signals can cause muscle damage and discomfort.

Therefore, the amplitude or voltage of an electrical signal used to stimulate a muscle must be carefully controlled to achieve the desired level of motor unit recruitment and force of muscle contraction without causing harm to the muscle tissue.

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Answer:

acidic colorless gas

Explanation:

Carbon dioxide is an acidic colorless gas with a density of about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas.

Answer:

Carbon dioxide is a acid.

Explanation:

Carbon dioxide is an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas

Answer:

a

Explanation:

The wavelength of the sound wave with a frequency of 20 Hz is approximately 17 meters.

To calculate the wavelength of a sound wave, we can use the below given formula:

Wavelength = Speed of sound / Frequency

Given that the speed of sound at room temperature is approximately 340 m/s and the frequency is 20 Hz, we can substitute these values into the formula:

Speed of sound = 340 m/s

Frequency = 20 Hz

Substituting the values into the given formula:

Wavelength = 340 m/s / 20 Hz

Calculating this, we find:

Wavelength = 17 meters

Therefore, the wavelength of the sound wave with a frequency of 20 Hz is approximately 17 meters.

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Cyclotron to make 1 milligram of the isotope fluorine-18 for use a a diagnostic tool with it PET scanner. It seems that the hospital should plan to make more F-18 the next morning, as the amount remaining at midnight is very small.

The half-life of F-18 is 1.8 hours, so after 1.8 hours, half of the original amount of F-18 will remain. After 3.6 hours, a quarter of the original amount will remain, and so on.

At 3:00 PM (9 hours after the F-18 was made), the hospital will have

= 1/2^(9/1.8)

= 1/2^5

= 1/32

= approximately 0.03125 milligrams of F-18 remaining.

At midnight (18 hours after the F-18 was made), the hospital will have

= 1/2^(18/1.8)

= 1/2^10

= 1/1024

= approximately 0.0009765625 milligrams of F-18 remaining.

While using cyclotron, based on these calculations, it seems that the hospital should plan to make more F-18 the next morning, as the amount remaining at midnight is very small.

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Answer:

F=m × a - answer is D

Explanation:

F=15N

m=m

a=0.33

15÷0.33=45.45...

Answer:

it binds the negatively charged electrons to the positively charged atomic nucleus.

Explanation:

its called Electromagnetic Force

Answer:

H = 86.5 m = 1/2 g t^2        to get time for cannon ball to fall 86.5 m

t = (2 * 86.5 / 9.8)^1/2 = 4.20 sec

S = Vx t = 105 m/s * 4.2 s = 441 m        horizontal distance

Answer:

Is always towards the center of the Earth

Explanation:

As a satellite moves around the Earth in a circular orbit, the direction of the force of gravity is always towards the center of the Earth. At an altitude of 100 km, you would be so high that you would see black sky and stars if you looked upwards.

Answer:

(First Opinion)
Their learning progress going to be stuck until the typhoon stopped, but nowadays we can do online learning (can be at wherever you're), so this doesn't affect much, unless the pupils/teacher directly affected by the typhoon.

(Second Opinion)

Their Learning progress will be stopped for until the goverment allow it, this is according to rules of some country, this is in order to uphold citizen's rights to life, health and safety.

Explanation:
First Opinion is to continue online, so it doesn't affect much.
2nd is to fully stop and suspend in which it affect the pupils learning progress.

Answer:5 hours

Explanation:

300 divided by 20 = 15

300 divided by 15 = 20

the difference is 5

Answer:

Hope it helped brainiest plz and thank you!!!!!!1

Explanation:

3. If humans could unleash genetic modifications upon mosquitos that would eradicate the species entirely, should they do it?

No, they should not eradicate the mosquitos because they are part of the food chain for some animals.