How fast will he be moving backward just after releasing the ball? Suppose that the quarterback takes 0.30 to return to the ground after throwing the ball.

A continuous record of annual average atmospheric CO2 concentrations from Mauna Loa, Hawaii, reveals A steady increase since 1958.

Since monitoring started in 1958, the Mauna Loa CO2 record reveals a steady rise in atmospheric CO2 concentrations. The yearly average concentration has climbed from around 315 parts per million (ppm) in 1958 to over 410 ppm in recent years. Human activities like the burning of fossil fuels and deforestation, both of which emit significant amounts of CO2 into the atmosphere, are the main causes of this increase. Global warming, ocean acidification, and other environmental changes brought on by this rise in CO2 present serious problems for human society and ecological systems.

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Answer:

44.13015

Explanation:

use the 9.8067 newtons to 1 kg conversion

The force exerted on the bucket by the rope is  44.1 N.

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. A spring balance can be used to calculate the Force. The Newton is the SI unit of force.

Given parameters:

weighs  of the bucket: M = 4.50 kg.

We know that acceleration due to gravity: g = 9.8 m/s².

Hence, gravitational force acting on the bucket in downwards = Mg

= 4.50 kg × 9.8 m/s²

= 44.1 N.

Hence, pulling up a bucket at a constant speed, the person have to exert 44.1 N force on the bucket by the rope  so that it can nullify gravitational force acting on the bucket in downwards.

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Answer:

Explanation:

Fe has 2 Fe ions making up Fe2O3

There are 3 oxygen ions making up Fe2O3

There are 3*2 = 6 hydrogen ions making up 3H2

If you haven't been told what an ion is, you can use atoms in your answer, but it is not entirely correct.

Answer:

answer is 2, 3, and 6

Explanation:

cuz it is

Answer:

\(\boxed {\boxed {\sf 400 \ J}}\)

Explanation:

Work is a force that causes the displacement of an object. It is the product of force and displacement.

\(W=Fd\)

The force is 40 Newtons and the displacement is 10 meters.

Substitute the values into the formula.

\(W= 40 \ N * 10 \ m\)

Multiply.

\(W= 400 \ N*m\)

Convert the units. 1 Newton meter is equal to 1 Joule, so our answer is equal to 400 Joules.

\(W= 400 \ J\)

400 Joules of work was done to move the block.

Answer:

400 J

Explanation:

This is the correct answer for k12

Formula for potassium dichromate is

K2Cr2O7

Answer:

The conservation of energy is a principle where according to which the energy of interacting bodies or particles in a closed system remains constant.

Explanation:

Answer:

a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.

Answer:

it would decrease i think

Explanation:

Answer:

HMMMMMM??????

Explanation:

The characteristic of Earth that maintains its atmosphere is gravity. Gravity is the force that pulls the gas molecules towards the Earth's surface, preventing them from escaping into space.

The atmosphere is made up of different types of molecules, including nitrogen, oxygen, and carbon dioxide, which are constantly in motion due to the Earth's rotation and the heat from the sun. However, gravity is what holds these molecules in place and creates a stable atmosphere around our planet.In contrast, planets such as Mars and Venus have weaker gravity and have lost much of their atmospheres over time. Our moon also has no atmosphere, as it lacks the gravitational force necessary to hold onto gas molecules. Overall, the strength of gravity is a crucial factor in determining the stability and composition of a planet's atmosphere.

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complete question:

Some planets (and our moon) have no atmospheres. What characteristic of the Earth maintains the atmosphere surrounding our planet?

A. The types of molecules in the atmosphere.

B.  Gravity.

D. It has only one satellite.

D. Tides

Nuclear reactions are independent of the chemical form of the element.

Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei.

D.

The distance of the motorboat relative to the home, which travels in various directions, is 3.07 km.

Relative velocity is a velocity of an object which is in respect to another observer, or it is a ratio of change in the position of a point to time with respect to another observer.

Given: Travel in East direction (\(d_{E}\))= 5 km,

velocity in N35E(v) = 2 m / s, time taken(t)  = 90 min = 5400 seconds,
Displacement in south (\(D_S}\)) = 6.5 km

Firstly, find the displacement  in N35E so

Displacement   = Velocity × time,

\(d_{NE}\) = 2 × 5400 = 10800 meters or 10.8 km

Now by using Pythagoras' theorem
We can calculate the return displacement in the south direction(\(d_{S}\)),

\(d_{S}\) = \(\sqrt{d^{2} _{NE}- d^{2} _{E } }\)
\(d_{S}\) = \(\sqrt{10.8^{2}-5^{2} }\)

\(d_{S}\) = 9.57 km

Therefore, the distance of the boat from the home (D) = \(d_S}\) - \(D_S}\)

D = 9.57 - 6.5;

D = 3.07 Km

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When physicists find a quantity that does not change, they say that the quantity is conserved. Conservation laws are fundamental to physics, and they are based on the principle of the conservation of energy, mass, and momentum. These laws state that these quantities cannot be created or destroyed, only transferred from one system to another.

For example, the law of conservation of energy states that the total energy of a closed system remains constant over time, meaning that energy cannot be created or destroyed, only transferred from one form to another. This principle applies to all forms of energy, including thermal, kinetic, potential, and electromagnetic. The conservation of mass and momentum are also essential principles in physics, which state that the total mass and momentum of a closed system remain constant over time. The concept of conservation is critical in physics because it allows us to predict and understand the behavior of physical systems and the laws that govern them.

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Ultra = X-ray

Explanation:

how are things going to paint the roof for beginners painting and decorating the whole house so I'm going away with a few sports mates for a couple nights for beginners but will have a look painting at a time and see what is going to be Strong enough

A.1.2°C

The First Law of Thermodynamics states that heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy.

To find internal energy, you have to add the heat added in the system and work done in the system because the work done is not lost but rather it is added in the system.

Step 1

a)let

to add the energy it must have the same measure unit, so let's convert calories into Julies

remember that

b) now, replace in the formula

now, we have the change of internal energy

Step 2

now, let's find the change in temperature

Use the calorimetry formula.

where m is the mass, Q = heat energy, c = specific heat capacity, and ∆T = change in temperature

a)

let

now,

so, the answer is

A.1.2°C

Self-ignition, also known as pre-ignition, occurs in an internal combustion engine when the fuel-air mixture in the combustion chamber ignites before the spark plug fires.

One way to avoid pre-ignition is to limit the compression ratio of the engine, as a higher compression ratio can lead to higher temperatures in the combustion chamber.

The ideal gas law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

The compression ratio of an engine is the ratio of the volume of the combustion chamber when the piston is at the bottom of its stroke (the "swept volume") to the volume of the combustion chamber when the piston is at the top of its stroke (the "clearance volume").

Given that the temperature at which self-ignition would occur using a certain brand of petrol is 350°C, and assuming that the ideal gas law applies, we can calculate the highest compression ratio that may be used to avoid pre-ignition.

To do this, we need to know the initial temperature and pressure in the combustion chamber, as well as the final temperature and pressure after compression. We can then use the ideal gas law to calculate the compression ratio.

In conclusion, based on the information provided, it is possible to calculate the highest compression ratio that may be used to avoid pre-ignition in an engine using the ideal gas law. However, more specific information such as the initial temperature and pressure and the specific brand of petrol is needed for a more accurate calculation.

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We will have the following:

First, we transform the revolutions per second to radians, that is:

Now, we will have that the final angular velocit will be given by:

So, the angular speed after coupling is -12pi/s. [That is the total angular speed will be counterclock wise]

Determination of the change in enthalpy ΔH during this transformation. Take 75.5

molK . entropy (ΔS) is given by,ΔS = q/T For isothermal expansion,ΔS = q/T _hot= 10/873ΔS = 0.0115 KJ/K.

1. Compute the efficiency of the engine: Given, Hot reservoir temperature =  T_ hot = 600°C = 873 K Cold reservoir temperature =  T_ cold = 25°C = 298 K Efficiency (η) of the Carnot engine is given by,η = 1 - T_cold/T_hotη = 1 - 298/873η = 0.658 = 65.8%2. The heat transferred to the cooling reservoir :Given, q1 = 10 kJ From the Carnot cycle, Heat absorbed by the engine, q1 = q2q2 = q1 = 10 kJ Heat rejected to the cooling reservoir, q3 = q4q3/q1 = T_ cold/(T_ hot - T_ cold)q3/10 = 298/(873 - 298)q3 = 2.32 kJ3. The change in entropy of the system during just the heating step: The change in entropy (ΔS) is given by,ΔS = q/T For isothermal expansion,ΔS = q/T_ hot= 10/873ΔS = 0.0115 KJ/K

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Answer:

To find the lateral area of a pyramid, we need to calculate the area of each triangular face and then add them together. The lateral area does not include the area of the base.

Explanation: Given the width and length of the base of the pyramid, we can calculate the height using the Pythagorean theorem. The height of the pyramid is the same as the height of each triangular face.

Using the Pythagorean theorem:

height² = slant² - (1/2 × width)²

height² = 40² - (1/2 × 60)²

height² = 1600 - 1800

height = √200

height = 10√2

The area of each triangular face can be calculated as:

area of triangle = (1/2 × base × height)

area of triangle = (1/2 × 60 × 10√2)

area of triangle = 300√2

Since the pyramid has four triangular faces, the total lateral area is:

lateral area = 4 × area of triangle

lateral area = 4 × 300√2

lateral area ≈ 1,695

Therefore, the lateral area of the pyramid is approximately 1,695 square meters, to the nearest whole number.

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According to Ohm's Law, the value of \(\frac{dI}{dR} \rvert \rvert R=-6\) is -3/4 or -0.75.

Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor. It can be mathematically represented as:

V = I * R

Where:

V represents the voltage (in volts),

I represents the current (in amperes),

R represents the resistance (in ohms).

To calculate dI/dR at R = -6 using Ohm's Law equation I = V/R, we can differentiate the equation with respect to R while treating V as a constant:

\(\frac{dI}{dR} = \frac{d}{dR} \left(\frac{V}{R}\right)\)

Using the quotient rule for differentiation, we have:

\(\frac{dI}{dR} = \frac{R \frac{dV}{dR} - V \frac{dR}{dR}}{R^2}\)

Since V is a constant (V = 27), the derivative dV/dR is zero. Also, dR/dR is equal to 1. Substituting these values, we get:

\(\frac{dI}{dR} = \frac{R * (0 - 27) * 1}{R^2}\)

\(=\frac{-27}{R^2}\)

Therefore, dI/dR at R = -6 is:

\(\frac{dI}{dR} \rvert \rvert R=-6\) \(=\frac{-27}{(-6)^2}\)

\(= -\frac{27}{36}\)

= -3/4 or -0.75 (in fractional notation).

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Answer:

Explanation:

The earth and a falling object are in an action-reaction force pair together. The falling object seem to be accelerating because of visible displacement as earth and the object have huge mass difference .

It is an action reaction force , but both earth and the object have different masses .  The accelerations of the objects depend on the masses of the objects acting on it is gravity.

Since earth is bigger in mass hence have greater gravity

The object and the Earth have very different masses, the object suffers a visible displacement, whereas the Earth’s displacement is not measurable  due to larger mass  . Since earth is bigger in mass hence have greater gravity .

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Answer:Ag2 O.

The formula for silver oxide is Ag2 O.

Explanation: one silver atom gives up an electron resulting in a +1 ion. Each oxygen atom requires two electrons to be stable.

Answer:

8.79 J

Explanation:

Given that a slinky is traveling down the stairs, like in the video clip below. What is the total KINETIC ENERGY of the slinky at the bottom of the stairs (just before it stops moving) IF the Height of the stairs is 2 meters, the weight of the slinky is 4.41 Newtons, its spring constant is 0.84 N/m, and the distance the slinky is initially stretched (to get it going) is 0.25 meters??

Total energy = mgh

Total energy = 4.41 × 2 = 8.82 J

Elastic potential energy = 1/2 × Ke^2

Elastic potential energy = 1/2 × 0.84 × 0.25^2

Elastic potential energy = 0.02625

Also,

Total energy = P.E + K.E

Substitute them into the formula above

8.82 = 0.02625 + K.E

K.E = 8.82 - 0.02625

K.E = 8.79375

K.E = 8.79 J

Therefore, the KINETIC ENERGY of the slinky at the bottom of the stairs is 8.79 Joules approximately

False, a personal foul does not necessarily involve illegal entry or excessive timeouts, though they can be part of a personal foul.

A personal foul is a penalty in certain sports, such as basketball and American football, that involves an illegal action by a player. A personal foul occurs when a player has unsportsmanlike conduct, illegal entry, or excessive timeouts. Unsportsmanlike conduct is defined as any action that is not considered to be ethical or respectful within a sporting event. This includes taunting, arguing with a referee, or showing disrespect towards another player or team.

Illegal entry is when a player enters a restricted area without permission or authorization. This can be a violation of the playing rules or a foul against another player. Excessive timeouts are when a team uses all of its allotted timeouts in a game or a player takes an excessive amount of time to make a decision, such as when taking a free throw.

All of these actions, when committed by a player, can be considered a personal foul. A personal foul is a violation of the rules that can result in a variety of consequences, from a warning to a technical foul, to a disqualification from the game. The severity of the consequences depends on the severity of the foul and the specific sport in which it is committed.

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Answer:

all I know is C

are there more questions? anyone?

-KARL IS STOOPID

Explanation:

Doppler's effect:

The Doppler effect states that the frequency of sound increases as it source approaches you and it decreases as the source turns away from you.

When the ambulance drives past you, the pitch of the siren is lower. This is due to the fact that the frequency of the wavelength decreases.

A higher pitch means frequency increases and a lower pitch means frequency decreases.

Therefore, the correct answer is option B. decreases

Answer:

Atoms.

Explanation:

Atoms are purely one bit of an element. Ions are positive or negative atoms. Molecules are not pure, they have other stuff with it.

The molecules of water determines  the macro scale appearance of the lake .

The term lake is used to describe any large body of water that is surrounded by land. We know that water is composed of molecules and the orientation of molecules affect the macro scale appearance of the water.

Hence, as the molecules of water change their orientation, the macro scale appearance of the lake changes likewise.

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Answer:

Newtons law of equal and opposite reactions

Explanation:

This is my best guess I'm sorry if it's not helpful