Point of View 10:Question 5
Read the sentences below to answer the question.
Zoe glared at her soccer opponent from across the field. She had practiced all week, but still, she had to conceal the growing lump of fear inside. Was she good enough to defend Star, her greatest rival? Meanwhile, Star kept her focus on the soccer ball, visualizing her first play and identifying the path she would take to the goal.
The narration style in the writing above is..
Select one:
first person
third person omniscient
third person limited
second person

Given :

Charge on human 1 , \(q_1=2\ C\) .

Charge on human 2 , \(q_2=-2\ C\) .

Force of attraction between them , F = 650 N .

To Find :

Force between them , F =- 650 N .( force between opposite charge is -ve )

Solution :

We know , electrostatics force between two charge is given by :

\(F=\dfrac{kq_1q_2}{r^2}\)

Here k is universal gravitational constant , \(k=6.67408 \times 10^{-11}\ m^3\ kg^{-1}\ s^{-2}\) .

Putting all given value in above equation we get :

\(-650=\dfrac{6.67408 \times 10^{-11}\times 2\times (-2)}{r^2}\\\\r=\sqrt{\dfrac{6.67\times 10^{-11}\times 2\times 2}{650}}\\\\r=6.40\times 10^{-7}\ m\)

Hence , this is the required solution .

Answer:

No.

Explanation:

Given that Kevin decides to soup up his car by replacing the car's wheels with ones that have 1.4 times the diameter of the original wheels. Note that the speedometer in a car is calibrated based on the tire's diameter and on the distance the tire covers in each revolution. (a) Will the reading of the speedometer change ?

Considering the formula

V = wr

Where

V = linear speed

W = angular speed

r = radius of the wheel.

But W = 2πrf

Where the the 2 and pi are constant. The radius of the first wheel will be small but counter balance with the larger frequency.

While the radius of the second wheel may be large but it will be of a small frequency.

We can therefore conclude that the reading on the speedometer will not change. Because speedometer will read the linear speed V.

The time will be the same for both horizontal and vertical component. The initial speed is 10.7 m/s

Speed is a distance travel per time taken. It is a scalar quantity and it is measured in m/s

Given that a person standing at the edge of a seaside cliff kicks a rock horizontally of the cliff from a height of 52 m and it lands a distance of 35 m from the base of the cliff.

The rock will move vertically downward with initial velocity = 0. The time taken will be constant. That is, same horizontally.

Let us first calculate the time by using the formula

h = ut + 1/2gt²

Where

Substitute all the necessary parameters into the formula

52 = 0 + 1/2 × 9.8 × t²

52 = 4.9t²

t² = 52/4.9

t² = 10.6

t = √10.6

t = 3.26 s

The speed at which the rock was initially kicked can be found by

R = Ut

35 = U × 3.26

U = 35/3.26

U = 10.7 m/s

Therefore, rock was initially kicked at a speed of 10.7 m/s

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The time taken by the object to reach the ground from the upper story of the school is 1.314 seconds. The impact of  velocity of the object is   29.07 m/s. The greatest distance from the surface that the object can have is 55.07 meters.

Acceleration is the rate of change in velocity. It is a vector quantity. The velocity of the falling object is 25 m/s and the distance to the ground is 3.65 × 9 = 32.85 meters.

Now, the time of flight  = distance / velocity

                                      = 32.85 m / 25 m/s

                                      = 1.314 s

The impact of speed = √2gh

                                   = √ (2 × 12.87 × 32.85 m)

                                   = 29.07 m/s.

The acceleration due to gravity is 12.87 m/s² and the time is obtained as 1.314 seconds with initial velocity of 25 m/s. Therefore, the final velocity is

v = u + at

   = 25 m/s + 12.87 × 1.314 s

   = 41.911 m/s

Hence the maximum distance with this velocity is = 41.911 × 1.314 s

= 55.07 m. Therefore, the maximum distance above the surface that the object can occupy is 55.07 m.

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Answer:

The  moment of inertia is  \(I =1.0697 \ kg m^2\)

Explanation:

From the question we are told that

    The  frequency is  \(f = 0.460 \ Hz\)

    The  mass of the pendulum is  \(m = 2.40 \ kg\)

    The  location of the pivot from the center is \(d = 0.380 \ m\)

Generally the period of the simple harmonic motion is mathematically represented as

        \(T = 2 \pi * \sqrt{ \frac{I}{ m * g * d } }\)

Where I is the moment of inertia about the pivot point , so making I the subject of the formula it

=>    \(I = [ \frac{T}{2 \pi } ]^2 * m* g * d\)

But the period of this simple harmonic motion can also be represented mathematically as

        \(T = \frac{1}{f}\)

substituting values

      \(T = \frac{1}{0.460}\)

      \(T = 2.174 \ s\)

So

      \(I = [ \frac{2.174}{2 * 3.142 } ]^2 * 2.40* 9.8 * 0.380\)

      \(I =1.0697 \ kg m^2\)

a. the speed of the ultrasound in water is 1480 m/s

b. the wavelength of the ultrasound in water is 37 m

c. the depth of the fish below the boat is 89.76 m

a.

v = fλ

v = fλ = (4.0 x 10^2 Hz)(λ)

the speed of the ultrasound in water is given as :

v = v_water = 1480 m/s

substitute v_water into the equation above and solve for λ:

λ = v_water / f = (1480 m/s) / (4.0 x 10^2 Hz) = 37 m

Therefore,  the speed of the ultrasound in water is 1480 m/s and the wavelength is 37 m.

c. The depth of the fish below the boat ia found using,

d = v_water * t / 2

The first echo came back after 0.09 s:

d = (1480 m/s) * (0.09 s) / 2 = 64.32 m

This is the depth of the sea bed, which is already known to be 64 m. So the fish must be deeper than the sea bed, and the second echo must have come from the fish. The second echo came back after 0.12 s:

d = (1480 m/s) * (0.12 s) / 2 = 89.76 m

So the depth of the fish below the boat is 89.76 m

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Freezing keeps food safe by slowing the movement of molecules, causing microbes to enter a dormant stage. Freezing preserves food for extended periods because it prevents the growth of microorganisms that cause both food spoilage and foodborne illness.

What is freezing food?

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Answer: Carbon is the chemical backbone of life on Earth. Carbon compounds regulate the Earth’s temperature, make up the food that sustains us, and provide energy that fuels our global economy.

A diagram of the carbon cycle with arrows showing the movement of carbon through a landscape with plants and animals, mountains and a volcano, a river leading to the ocean, and an industrial area. Carbon moves in and out of our atmosphere, ocean, waterways, and soil through burning fossil fuels, precipitation, fires, vegetation, volcanoes, and organic processes.

The carbon cycle. (Image credit: NOAA)

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Most of Earth’s carbon is stored in rocks and sediments. The rest is located in the ocean, atmosphere, and in living organisms. These are the reservoirs through which carbon cycles.

This graph shows the monthly mean carbon dioxide measured at Mauna Loa Observatory, Hawaii, the longest record of direct measurements of CO2 in the atmosphere.

Climate change: Atmospheric carbon dioxide

Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.

Carbon storage and exchange

Carbon moves from one storage reservoir to another through a variety of mechanisms. For example, in the food chain, plants move carbon from the atmosphere into the biosphere through photosynthesis. They use energy from the sun to chemically combine carbon dioxide with hydrogen and oxygen from water to create sugar molecules. Animals that eat plants digest the sugar molecules to get energy for their bodies. Respiration, excretion, and decomposition release the carbon back into the atmosphere or soil, continuing the cycle.

The ocean plays a critical role in carbon storage, as it holds about 50 times more carbon than the atmosphere. Two-way carbon exchange can occur quickly between the ocean’s surface waters and the atmosphere, but carbon may be stored for centuries at the deepest ocean depths.

Rocks like limestone and fossil fuels like coal and oil are storage reservoirs that contain carbon from plants and animals that lived millions of years ago. When these organisms died, slow geologic processes trapped their carbon and transformed it into these natural resources. Processes such as erosion release this carbon back into the atmosphere very slowly, while volcanic activity can release it very quickly. Burning fossil fuels in cars or power plants is another way this carbon can be released into the atmospheric reservoir quickly.

A research vessel ploughs through the waves, braving the strong westerly winds of the Roaring Forties in the Southern Ocean, in order to measure levels of dissolved carbon dioxide in the surface of the ocean.

Southern Ocean confirmed as strong carbon dioxide sink

New research utilizes airborne measurements of carbon dioxide to estimate ocean uptake.

Changes to the carbon cycle

Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. As a result, the amount of carbon dioxide in the atmosphere is rapidly rising; it is already greater than at any time in the last 3.6 million years. The ocean absorbs much of the carbon dioxide that is released from burning fossil fuels. This extra carbon dioxide is lowering the ocean’s pH, through a process called ocean acidification. Ocean acidification interferes with the ability of marine organisms (including corals, Dungeness crabs, and snails) to build their shells and skeletons.

An aerial view of Century City section of Los Angeles, California.

Atmospheric carbon dioxide rebounds as global pollution rates approach pre-Covid levels

Global carbon emissions are projected to bounce back to after an unprecedented drop caused by the response to the coronavirus pandemic, according to an annual report by the Global Carbon Project.

EDUCATION CONNECTION

Take a bite of dinner, breathe in air, or a drive in a car — you are part of the carbon cycle. The resources in this collection provide real world examples of the changes occurring in the cycle. There is much to learn about this essential topic, and some of the resources highlight exciting career opportunities in this field of study.

Explanation: learn from a middle schooler like me smart

Carbon was formed in stars through nuclear fusion and scattered into space when the star died. Carbon was incorporated into organic molecules through photosynthesis and eventually became part of animals' bodies. The carbon cycle involves the uptake of carbon dioxide by plants, transfer to animals, and release back into the atmosphere through respiration and decomposition, and human activities have disrupted this cycle.

Carbon was formed in the universe through nuclear fusion reactions that took place in the cores of stars. These reactions fused lighter elements into heavier ones, including carbon. When the star eventually died in a supernova explosion, the carbon and other elements were scattered into space.

The carbon, along with other elements, eventually formed clouds of gas and dust that coalesced to form new stars and planets. On our planet, carbon was incorporated into organic molecules through photosynthesis by plants and other photosynthetic organisms. These organic molecules were then consumed by animals, which allowed the carbon to become part of their bodies.

The carbon cycle is the process by which carbon moves through the Earth's atmosphere, oceans, and biosphere. This cycle involves the uptake of carbon dioxide by plants through photosynthesis, the transfer of carbon from plants to animals through the food chain, and the release of carbon back into the atmosphere through respiration and decomposition. Human activities, such as the burning of fossil fuels, have disrupted this cycle, leading to increased levels of carbon dioxide in the atmosphere and contributing to climate change.

Therefore, Nuclear fusion in stars produces carbon, which is then released into space when the star dies. By photosynthesis, carbon was added to organic molecules, eventually becoming a component of animal bodies. Human activities have interrupted the carbon cycle, which involves the intake of carbon dioxide by plants, its transport to animals, and its release back into the atmosphere through respiration and decomposition.

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Answer:

If two vectors are equal, their components are also equal. For example, vector A and B both share the same x, y, and z components. By having the same components, the magnitude and direction does not change, which attest to how the vectors are identical.

So, if two vectors are equal, their components are also equal.

In vector mathematics, when two vectors are equal, it means their corresponding components are also equal. Thus, the magnitude and direction of the two vectors must be identical.

In the world of mathematics, specifically vector mathematics, if two vectors are equal, that means their corresponding components are also equal. A vector is typically described by its individual components which are its magnitude (size) and direction.

For example, if vector A and vector B are equal, and vector A = \((x_1, y_1)\) and vector B = \((x_2, y_2)\), then\(x_1 = x_2\) and \(y_1 = y_2\). This applies to vectors in two-dimensional and three-dimensional spaces as well. Therefore, equality in vectors involves the same direction and magnitude causing the corresponding components to be equal.

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Answer:

the greater the height of an object the *greater* its gravitational potential energy

greater

Answer:

Explanation:

How do the nuclei of covalently bonded atoms help keep the bond together? ... -Positive particles in the nucleus are attracted to shared electrons, so the atoms stay close together. Positive particles in the nucleus are attracted to shared electrons, so the atoms stay close together.

The shared electrons in the nucleus attract positive particles, keeping the atoms close to one another. The shared electrons in the nucleus attract positive particles, keeping the atoms close to one another.

The smallest unit of matter that may be divided without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.

The atom is mostly made up of void space. The remaining material is made up of an electron cloud that is negatively charged and is encircled by a positively charged nucleus made up of protons and neutrons.

In contrast to the nucleus, which is compact and dense, the electrons—the lightest charged particles in nature—are big and sparse. Electric forces in an atom bind the electrons to the nucleus, making them drawn to the nucleus by any positive charge.

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Vehicles need to be serviced for several reasons such as preventing costly repairs and improving fuel economy.

First, regular maintenance can help to prevent costly repairs down the road. Second, maintenance can help to improve fuel economy and emissions. Third, maintenance can help to keep your vehicle safe and reliable.

The servicing requirements for petrol/diesel and electric vehicles differ in a number of ways. Petrol/diesel vehicles require oil changes more frequently than electric vehicles. This is because petrol/diesel engines use oil to lubricate the moving parts, while electric motors do not. Petrol/diesel vehicles also require tune-ups more frequently than electric vehicles.

This is because petrol/diesel engines have more moving parts that need to be synchronized, while electric motors have fewer moving parts.

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Answer:

B. soft tissue injuries

Explanation:

i took the test on edge and its really the only one that would make sense if you payed attention to the lesson  :)

The weight is measured in a unit called Newton. The newton is a standard unit of weight measurements.

The International System of Units (SI) uses Newtons (N) as the unit of weight measurement. Weight is frequently expressed in pounds (lb) or ounces (oz) in some nations that employ the Imperial system. However, Newton is the accepted weight measurement unit in scientific and international contexts.

The International System of Units (SI) uses Newton as the primary unit of weight measurement. Sir Isaac Newton, a great physicist who significantly influenced our understanding of classical mechanics, is honored by having his name attached to it. Newton is the force needed to accelerate a mass of one kilogram by one meter per second squared in the SI system.

Hence, the weight is measured in a unit called Newton. The newton is a standard unit of weight measurements.

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After all analysis, the following conclusion was reached:

a. The velocity of the basket ball is not constant.

a. Basketball acceleration is constant.

c. the basket ball's starting velocity is 0.6 m/sec

Step 1

Looking at the position time graph, we can claim that it is parabolic and that the equation that satisfies it is a quadratic equation at time t = 0 and time t = 0.6. Because the parabola opens on the negative y - axis, the coefficient of t2 must be negative (position axis).

It is to be noted that from t=0 to t= 0.6 is a positive progression. After t=0.6, the position of the ball's trajectory becomes negative.

From the foregoing, the graphs equation can be enumerated as follows:

X(t) = -t(t-0.6)

X(t) = -t² + 0.6t..............equation 1

We can test the two points by inserting arbitrary values into equation 1.

Step two : The velocity time graph:

V = Dx(t)/Dt

= (d/dt) (-t² + 0.6t)

= -2t + 0.6 m/sec.............equation 2

Note that the graph of velocity is usually a straight line with a negative slope. In this case, the y-axis intercept is 0.6. See the attached image. At t = 0.3 seconds, Velocity equals Zero.

A) The velocity of the basket ball is not constant as it depends on the amount of time elapsed.

V = -2t + 0.6 m/sec

B) acceleration of the basketball is given by,

a = Dv/Dt = -2 m/sec²

Step 3

As observed, acceleration id not dependent on time. Acceleration is constant.

C) to compute the initial velocity we have to insert

t = 0 int o the equation of velocity.

Vat t=0   =0.6m/sec

From the foregoing therefore, we can deduce that:

a. The velocity of the basket ball is not constant.

a. Basketball acceleration is constant.

c. the basket ball's starting velocity is 0.6 m/sec.

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The vector whose magnitude is 36 and inclination is 60° is v = <18, 18√(3)>.

The inclination of a vector is the angle between the vector and a reference line. In this case, the reference line is the horizontal axis. Let the components be x and y. We know that the magnitude of the vector is 36, so,

magnitude = √(x² + y²) = 36

Squaring both sides of this equation, we get,

x² + y² = 1296

We also know that the inclination is 60°. The tangent of 60° is √(3), which is equal to the ratio of the vertical component to the horizontal component of the vector,

tan(60°) = y/x

y/x= √(3)

Multiplying both sides by x, we get,

y = √(3)x

Now we can substitute y in terms of x in the equation x² + y² = 1296,

x² + (√(3)x)² = 1296

Simplifying this equation, we get,

4x² = 1296

x² = 324

Taking the square root of both sides, we get,

x = +/- 18

Since the vector is making an angle of 60° with the horizontal, it must be in the first or fourth quadrant, where x is positive. Therefore, we take x = 18. Using y = √(3)x, we get,

y = sqrt(3)18

y = 18√(3)

So the vector is,

v = <18, 18√(3)>

Therefore, the vector whose magnitude is 36 and inclination is 60° is v = <18, 18√(3)>.

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I CAN'T GIVE ANSWER OF THIS QUESTION BECAUSE THIS QUESTION IS FROM EXAM

Answer:

Q = 8368 Joules.

Explanation:

Given the following data;

Mass = 50 g

Initial temperature = 30°C

Final temperature = 70°C

Specific heat capacity = 4.184 J/g °C

To find the amount of heat absorbed by the water;

Heat capacity is given by the formula;

\( Q = mcdt\)

Where;

Q represents the heat capacity or quantity of heat.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

dt = T2 - T1

dt = 70 - 30

dt = 40°C

Substituting the values into the equation, we have;

\( Q = 50*4.184*40\)

Q = 8368 Joules.

Answer:

It's 0.264cm in total reading

The following statements is correct about force f, kinetic energy k and momentum p of an object of mass m are (a) Force is the rate at which momentum changes.

Momentum is a concept in physics that describes the motion of an object. It is determined by the mass and velocity of an object, and is represented by the formula: momentum = mass x velocity.

Momentum plays an important role in physics, as it is the conserved quantity of motion for a system. It is a vector quantity, which means it has both a magnitude and a direction. In a collision, momentum is conserved, meaning that the total momentum of the system remains the same before and after the collision.

Momentum is also important in sports, as it can be used to understand how to maximize or minimize the speed and direction of a ball.

We know that

Force = m × a

m = f/a

And

Momentum = m × v

m = p/v

Also

= 1/2mv²

m = 2K.E./v²

Now taking M into account for all we can say that

\($ \frac{\text{Force}}{\text{Acceleration}} = \frac{\text{Momentum}}{\text{velocity}} = \frac{2 \ \text{Kinetic Energy}}{\text{velocity}^2}\)

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Answer::

   \(\lambda = 634 nm\)

  \(f = 4.73 *10^{14} \ Hz\)

Explanation:

From the question we are told that

      The  distance of separation is  \(d = 0.047 \ mm = 0.047 *10^{-3} \ m\)

       The  distance of the screen is  \(D = 6.60 \ m\)

      The  width of the fringe is \(y = 8.9 \ cm = 0.089 \ m\)

Generally the width of the width of the fringes is mathematically represented as

          \(y = \frac{\lambda * D }{d }\)

=>       \(\lambda = \frac{y * d }{D }\)

=>      \(\lambda = \frac{ 0.089 * (0.047 *10^{-3}) }{6.60 }\)

=>    \(\lambda = 634 *10^{-9}\)

=>  \(\lambda = 634 nm\)

Generally the speed of light is mathematically represented as

         \(c = f * \lambda\)

=>       \(f= \frac{ c}{\lambda }\)

=>         \(f= \frac{ 3.0 *10^{8}}{634 *10^{-9}}\)

=>     \(f = 4.73 *10^{14} \ Hz\)

The cannon will completely stop when it collides with the barrier.

To calculate the speed at which the cannon collides with the barrier, we can follow these step-by-step calculations:

Determine the initial momentum of the system.

Since the cannon is initially stationary, the initial momentum is zero.

Apply the conservation of linear momentum.

According to the principle of conservation of linear momentum, the initial momentum of the system (zero) is equal to the final momentum of the system. The final momentum is the momentum of the cannon after firing.

Calculate the final momentum of the system.

Let's assume the mass of the cannon is represented by 'm' and the final velocity of the cannon is represented by 'v'. The final momentum of the system is given by: final momentum = m × v.

Set up the equation.

Since the initial momentum is zero, we have: 0 = m × v.

Solve for the final velocity of the cannon.

Dividing both sides of the equation by 'm', we get: v = 0.

Interpret the result.

The calculation shows that the final velocity of the cannon is zero. This means that the cannon comes to a complete stop when it collides with the barrier.

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Given that the force between two charged particles, we'll call charge 1 and 2 is, \(\vec F_{0}=200 \ N\). The question asks us to find the new force between charges 1 and 2 if the charge on 1 increases by 3 times and the charge on 2 decreases by 4 times.

Equation to calculate the electric force between two charged particles:

\(\vec F_e=k_e\frac{q_1q_2}{r^2} \\\\ k_e=Coulomb's \ Constant= 8.99 \times 10^9 \ \frac{Nm^2}{C^2}\\\)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\(\vec F_0=k_e\frac{q_1q_2}{r^2} =200 \ N \ and \ \boxed{\vec F_f=k_e\frac{(3 q_1)(\frac{1}{4} q_2)}{r^2} }\)

\(\Longrightarrow \vec F_f=k_e\frac{(3 q_1)(\frac{1}{4} q_2)}{r^2} \Longrightarrow \vec F_f=\frac{3}{4} k_e\frac{q_1 q_2}{r^2} \Longrightarrow \vec F_f=\frac{3}{4}(200) \Longrightarrow \boxed{\boxed{\vec F_f=150 \ N}}\)

Thus, the new force would be 150 N.

The new force will be 150N

The force between two charged objects is given by Coulomb's law, which states that the force is proportional to the product of the charges and inversely proportional to the square of the distance between them. Mathematically, Coulomb's law can be expressed as:

F = k * (q1 * q2) / r^2

where F is the force, k is Coulomb's constant, q1 and q2 are the charges of the two objects, and r is the distance between them.

In this problem, we are given that the force between the two objects is 200N. Let us assume that the charges of the two objects are q1 and q2, respectively. Using Coulomb's law, we can write:

200 = k * (q1 * q2) / r^2

Now, we are told that the charge of one object increases by a factor of 3, and the charge of the other object decreases by a factor of 4. Let us call the new charges q1' and q2', respectively. We can write:

q1' = 3 * q1

q2' = (1/4) * q2

Substituting these expressions into Coulomb's law, we get:

F' = k * (q1' * q2') / r^2

= k * [(3 * q1) * ((1/4) * q2)] / r^2

= k * (3/4) * (q1 * q2) / r^2

= (3/4) * F

Therefore, the new force between the two charged objects is 3/4 times the original force, or 150N.

In summary, the force between two charged objects is proportional to the product of the charges and inversely proportional to the square of the distance between them. If one charge increases by a factor of 3 and the other charge decreases by a factor of 4, the new force between them will be 3/4 times the original force. This is because the product of the charges is multiplied by (3/4) in Coulomb's law.

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The horizontal component of the vector is determined as 6i.

The horizontal component of the vector is calculated as follows;

V = (0 i, 0 j) + (6i, 8j)

V = (6i, 8j)

where;

Thus, the horizontal component of the vector is determined as 6i.

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Answer:

An example would be

Explanation:

You have a ball with a mass of 10 kg swinging from a rope arond in a cirlce if we were to change the mass of the ball to 20 kg the kinetic energy would increase because we know the ball has more mass and more mass means ner force increases which is connected to kinetic energy. hope this answer helps!

Answer: large intestine

Explanation:

mouth grind and moisten food

saliva break down starch into sugar

esophagus transport food from mouth to stomach

stomach churn food, break down food with enzymes

liver add bile to break down fat

pancreas add enzymes to digest protein

gallbladder store bile

small intestine absorb food through villi

large intestine absorb extra water and remove waste from body