After measurements or observations are made in a scientific investigation, it is most appropriate to
A.
formulate a hypothesis.
B.
draw a conclusion.
C.
organize the data in a chart or table.
D.
propose a new scientific question.

The new and existing aquatic organisms thrive during the Mesozoic era for oceanic expansion, warm climate, abundant food and Evolutionary innovations

The Mesozoic era, which lasted from about 252 million years ago to 66 million years ago, was a time of great change in the Earth's climate and geography. During this period, new and existing aquatic organisms thrived due to several factors:

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If the question is asking for acceleration,

To find acceleration, we have to find the change in velocity over the change in time

In this case, the change of velocity is -30 km/hr and the change in time is 5 seconds

We must convert the units of sec to hours to solve this question

5 sec * 1 min/60 seconds * 1 hour/60 min = .00138889 hours

acceleration = change in velocity / change in time = -30 km/hr / .00138889 hours = -21599.999 km/hr^2 = ~-21600 km/hr^2

Answer:

1st box: increase

supporting evidence: As the girl swings downward she will gain more height due to the increasing force pushing her

2nd box: increase

supporting evidence: the magnetic force of the earth will increase the kinetic energy of the girl when she goes downward slightly as she swings forward

3rd box :increase

supporting evidence:As the girl swings downward she will gain more speed due to the gravitational pull

Explanation:

Answer:

It spreads diseases.

Explanation:

But when cooked food is kept on the place where uncooked meat or food was kept the germs spread to the cooked food also and as the cooked food cannot be washed it harms us as we directly consume it.

Using the Bohr model, we can calculate what photons were absorbed giving transitions in the Hydrogen atom; the correct answer is

The photon  to be absorbed are: 2.00 10⁻¹⁹ J, Balmer serie in the visible

                                                       1.00 10⁻¹⁹ J, Paschem serie in infrared

The other photons cannot be absorbed

The energy of the photons is given by the PlanK equation

             E = h f

where h is Plank's constant and f is the frequency of the photons

For the absorption by an atom, the photons must have an energy equal to greater than the difference in energy of the levels involved, in case the energy of the detachment of an electron must be greater than or equal to the ionization energy.

In this exercise it is not indicated which specific atom is being analyzed, but the most common of them is Hydrogen.

The ionization energy of hydrogen is

        E = 13.6 eV (1.6 10-19 J / 1 eV) = 21.76 10-9 J

in atomic transitions it is ususal to work in units of lectronVolts and if necessary reduce to Joule.

when checking the given values ​​none of these photons can ionize the hydrogen atom.

The energy of the atomic levels is given by the Bohr model for the hydrogen atom

             E = \(- \ \frac{13.606}{n^2}\)   [eV]

where n is a number in between and the amount in brackets are units , therefore the transition between two levels is given by

            ΔE = 13.606 (  \(\frac{1}{n_o^2} - \frac{1}{n_f^2}\) )    [eV]

where n₀ and n_f are integers corresponding to the initial and final states of the transition, in the table we see the values ​​for several transitions

n₀    n_f     ΔE [eV]      ΔE  [10⁻¹⁹ J]

1       2         10.2            16.3

2      3          1.89             3.0

3      4          0.66             1.1

let's compare these results with the energies of the incident photons

a) the photon of 2.00 10⁻¹⁹ j

can give transition between the state n = 2 and n = 3 that corresponds to the Balmer series, in the visible of the electromagnetic spectrum

b) the photon of 1.00 10⁻¹⁹ J

It is absorbed giving transitions between levels n = 3 to n = 4 which corresponds to a  Paschem series in the infrared of the electromagnetic spectrum

c) photons 8 10-19, 7 10-19 and 9 10-19 J

they cannot be absorbed by the hydrogen atom and they do not correspond to any permitted transition according to the Bohr model.

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The original sample is a compound.

Based on the given explanation, the best explanation of his results would be The heating changed some of the sample to gas, causing the mass to decrease without breaking down the sample. Therefore, the original sample is a compound.

This is because the mass of the sample decreased, which indicates that some portion of the sample was converted into gas. This suggests that the original sample is a compound that can decompose into its constituent elements upon heating, rather than being an element that is not affected by heating. Additionally, the fact that the appearance of the sample did not change suggests that the substance did not break down into smaller components, further supporting the idea that the original sample was a compound rather than an element.

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Answer:

Gold is metallic, with a yellow color when in a mass, but when finely divided it may be black, ruby, or purple. It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength.

Formula  --

Molecular Weight (lb/m o l)  28.96

Critical Temp. (°F)  N/A

Critical Pressure (p s i a)  N/A

Boiling Point (°F)  -317.8

Melting Point (°F)  N/A

Psat  70°F (p s i a)  (note 1)

Explanation:

We can use the power output of the engine to make some estimates about the resistive forces. The force acting is 8000 N.

Without more information about the sportscar, it's impossible to calculate the resistive forces acting on it. We would need to know the car's mass, its coefficient of drag, the rolling resistance of its tires, and any other factors that might affect the resistive forces.

Power is the rate at which work is done, and work is force times distance. If we assume that the car is moving at a steady speed of 25 m/s, we can estimate the resistive forces based on the power output of the engine.

Power = force x velocity

Rearranging this equation gives us:

Force = Power / velocity

Putting the values given in the question, we get:

Force = 200,000 / 25

Force = 8,000 N

This calculation gives us an estimate of the total force acting on the car, which includes both the resistive forces and any forces that are propelling the car forward (such as the force from the engine). Without more information about the car, it's impossible to say how much of this force is due to resistive forces. However, we can say that if the car is traveling at a steady speed of 25 m/s, the resistive forces must be balanced by the forces propelling the car forward.

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Answer:

heterotroph

Explanation:

Answer:

a predator cannot make its own food

Answer:

1.....

2.....

Explanation:

1. For the elements in column 1,2 and 13-18 the atoms in the same column have the same amount of outermost electrons, called valence electrons. Atoms in column 1 (H, Li and Na for example) have 1 valence electron.

2. Electron affinity increases from left to right across the periodic table. This is caused by the decrease in atomic radius. As we already explained, moving from left to right across a period, atoms become smaller and smaller as the atomic number increases.

The system is open, because there is a net force exerted on the block.

An individual strolling, a taking off baseball, a piece tumbling from a table and a charged molecule in an electric field are instances of dynamic energy at work. An item that isn't moving has zero motor energy.

The energy an item has as a result of motion is known as kinetic energy. A force must be applied to an item in order to accelerate it. We must put forth effort in order to apply a force. After the job is finished, energy is transferred to the item, which then moves at a new, constant speed.

According to question:

On graphing free body diagram of the problem

There is a force = mgsin(37°)

So, the it is a open system.

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Answer:

18.75

Explanation:

p=mv, where p is momentum, m is mass, and v is velocity. For the car:

p=1200*2.5=3000

For the deer:

3000=160*v

v=18.75m/s

Hope this helps!

Destructive interference occurs when the maxima of two waves are 180 degrees apart: a positive displacement of one wave is precisely cancelled by a negative displacement of the other wave. A zero amplitude wave is the result.

Interference is defined as the presence of waves from two separate sources that have different wavefronts. Diffraction, on the other hand, is described as secondary waves that split off from the primary wave. Two waves are superimposed during interference to produce an amplitude-variable wave. Interference is the process of superimposing two waves to produce a subsequent wave with a different velocity. Two waves are superimposed in the interference process to produce a new wave with a different wavelength.

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The product among alcohol, gasoline, travel souvenirs, cigarettes that will have elastic demand is cigarettes.

Elastic demand refers to a situation in which a change in the price of a good or service results in a more significant change in the amount demanded. When the percentage change in quantity demanded is greater than the percentage change in price, the demand for the product is said to be elastic.

When the quantity demanded of a product decreases significantly when the price rises, the demand for the product is said to be elastic. Similarly, when a slight change in price causes a significant change in quantity demanded, the demand is said to be elastic. Conversely, if a product's price increases by a small percentage, and the demand for the product decreases by a smaller percentage, the demand for the product is said to be inelastic.

Cigarettes, of all the products listed above, are likely to have an elastic demand.

This is because smokers who are addicted to cigarettes are more likely to quit smoking or reduce their consumption in response to an increase in the price of cigarettes compared to the other goods.

Thus, a slight increase in the price of cigarettes is likely to cause a significant decrease in the number of cigarettes consumed.

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Answer:

The atomic weight

Explanation:

The property of isotopes that must be different is the atomic weight.

Isotopes are generally referred to as atoms of the same element with the same atomic number (proton number) but different neutron numbers.

Since the atomic weight of an atom is the sum of proton and neutron, atomsof the same element with different number of neutrons will definitely have different atomic weight.

The three factors that affects thermal energy are temperature, mass and Specific heat capacity

The three factors that affect thermal energy are:

Temperature: The temperature of an object determines the average kinetic energy of its particles. As the temperature increases, the kinetic energy of the particles also increases, leading to an increase in the object's thermal energy.

Mass: The mass of an object affects its thermal energy because more massive objects contain more particles that are in motion, resulting in a higher thermal energy.

Specific Heat Capacity: The specific heat capacity of a substance is the amount of heat required to raise the temperature of one unit of mass of that substance by one degree Celsius. Different materials have different specific heat capacities, so the amount of thermal energy required to raise the temperature of an object depends on its specific heat capacity.

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The  is that the velocity of water flow in the pipe on the second floor is 13.6 m/s.

To calculate the velocity of water flow on the second floor, we can use Bernoulli’s principle which states that the pressure and speed of a fluid are inversely proportional to each other. Pressure + (1/2) * Density * Velocity^2 + Density * g * Height

= Constant (where g = acceleration due to gravity)In this problem, since the pressure remains unchanged, we can eliminate the first term on both sides of the equation for both positions. Using Bernoulli’s principle for position 1 and 2 as:

(1/2) * Density * Velocity1^2 + Density * g * H1 = ConstantPosition 2:

(1/2) * Density * Velocity2^2 + Density * g * H2

= ConstantConstant

= (1/2) * Density * Velocity1^2 + Density * g *

H1Taking the difference of the above equations we get:1/2 * ρ * (V2^2 - V1^2)

= -ρghV2^2 - V1^2

= -2ghV2^2 = V1^2 - 2ghV2

= √(V1^2 - 2gh)

The negative sign is ignored as it represents the direction of flow. Putting the values we get:

V2 = √(15^2 - 2 × 9.81 × 3)

= 13.6 m/s

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Answer:                                                                                                                     It states that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by an unbalanced force.

Explanation:

hope i helped

Answer: A object that is currently in motion will stay at motion. The law of interia is also known as Newton's first law of motion.

Explanation:

Explanation:

centripetal force is a force that makes a body follow a curved path. for example, twirling,a lasso, cream seperator etc.

A force that causes an objectmoving in a circular path to move out and away from the centres of it's path is centrifugal force. for example,drifting, banked roads, washing machine etc.

Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. for example, stirring batter, stone tied to a string etc

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Answer:

That is very true, there can never be 100% energy conversion.

Answer:

b is the right answer

Explanation:

Answer:

a. Dugan's average speed for the entire race was 2.47 m/s.

b. Dugan's average speed for the first 25.00 m leg of the race was 2.48 m/s.

c. Since the starting and ending points are the same, the displacement is zero. Therefore, the average velocity is also zero.

Explanation:

To solve this problem, we'll need to use the formula:

average speed = total distance / total time

where total distance is the distance covered in the entire race (50 meters), and total time is the time it took Dugan to cover that distance.

a. To find Dugan's average speed for the entire race, we'll need to add up the times for both legs of the race:

total time = 10.08 seconds + 10.17 seconds = 20.25 seconds

Now we can plug in the values:

average speed = 50 meters / 20.25 seconds = 2.47 m/s

So Dugan's average speed for the entire race was 2.47 m/s.

b. To find Dugan's average speed for the first 25.00 m leg of the race, we'll need to use the formula again, but this time we'll only consider the first leg of the race:

average speed = 25 meters / 10.08 seconds = 2.48 m/s

So Dugan's average speed for the first 25.00 m leg of the race was 2.48 m/s.

c. Average velocity is the displacement (change in position) divided by the time taken. Since the starting and ending points are the same, the displacement is zero. Therefore, the average velocity is also zero.

Answer:

the guy above is actually right :)

Explanation:

Answer:

Accept electron flow

Explanation:

The battery gives a change in the potential and the light bulb works like a resistor, so we will need a material that allows the flow of current. Therefore, we need a material that has the ability to accept electron flow.

So, the answer is:

Accept electron flow

Answer:

try this

Explanation:

The energy of a falling object when it hits the ground is equaled to the energy it starts with because the potential energy is converted into kinetic energy entirely with the height at 0. This means the energy would be 200 J.

RESULT

Answer:

1. Unbalanced Force (If you increase force, the acceleration will increase)

2. Mass of Body (If you increase mass, the acceleration will decrease)

Explanation:

According to Newton's Second Law the acceleration produced in a body depends upon two variables. The law states that:

“When an unbalanced force is applied on a body then an acceleration is produced in it, in its own direction”

The magnitude of produced acceleration is directly proportional to the applied force and inversely proportional to the mass of body. Mathematically,

   a α F

and,    a α 1/m

where,

a = acceleration

F = Unbalanced Force

m = Mass of Body

So, the acceleration increases when the unbalanced force increase and vice versa.

And the acceleration decreases when the mass of body increase and vice versa.

combining above equations:

a α F/m

a = (Constant)F/m

here,

Constant = 1

therefore,

F = ma

Answer:the magnitude of the hikers resultant displacement

Explanation:

potential energy is converted to kinetic energy as the ball drops.

they will be equal at the halfway point.

answer: 5 m