Leo placed two Circles of paper and a petri dish (something used for bacteria ) one Circle of paper was soaked in penicillin the other had nothing on it. He poured a liquid filled with bacteria into the Petri dish both Circles of paper were placed in The Petri dish about 3 cm apart at the end of the experiment a circle with a radius of 2 centimeters formed around the circle of paper soaked in penicillin there where no bacteria growing in the two centimeter Circle nothing had occurred around the other circle of paper the Victoria were going well.

a. what was the Dependant variable ?
b. what was the Dependant variable ?
c. what was the control group?
d. was there a controlled variable?
e. if yes, explain

First let us compute for the total growth in population.

Growth = 155 million * 0.01

Growth = 1.55 million

Since there are 12 months in a year, therefore the new jobs every month should be:

new jobs per month = 1.55 million / 12

new jobs per month = 0.129 million = 129,167 

To keep unemployment from increasing in a labor force of 155 million growing at 1.0 percent per year, around 129,167 new jobs need to be created each month.

If the labor force of 155 million people is growing by 1.0 percent per year, the total increase in the labor force per year would be 1.55 million people (155 million times 1%). To determine the number of new jobs needed to be created each month to keep unemployment from increasing, we divide this annual increase by 12 months. Thus, 1.55 million divided by 12 gives approximately 129,167 jobs that need to be created each month.

Answer:

Correct Answer is option 4 (It’s a composite because it’s a mixture of cement, sand, and other granular pieces.)

Explanation:

Concrete :

Concrete is a mixture which is made up of sand, cement, granular pieces and water. sand can be spread anywhere in liquid form and when it dries it becomes hard as stone. Concrete is used for making buildings.

Composite:

Composite is a material which is formed by mixing various element

Since Concrete is formed on mixing various element like cement, granular pieces, water and sand. Therefore concrete is a material which belong to composite category.

Answer:

4+5=9 amu

Explanation:

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.

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Final answer:

The extra work required to stretch the Hooke's-law spring an additional 11.3 cm is 0.9375 J.

Explanation:

To find the extra work required to stretch the Hooke's-law spring an additional 11.3 cm, we can use the formula for the work done by a spring force: W = ½kx², where W is the work done, k is the spring constant, and x is the displacement. Given that it takes 3.3 J of work to stretch the spring 15 cm, we can first find the spring constant:

k = 2W / x² = 2(3.3 J) / (0.15 m)² = 146.67 N/m

Now we can calculate the extra work required to stretch the spring an additional 11.3 cm:

W' = ½kx'² = ½(146.67 N/m)(0.113 m)² = 0.9375 J

Answer:

Because it is refracting

Answer:

D.temporarily displaced and return to their normal position when the wave passes.

Explanation:

When a wave propagates in a medium, it does going through the particles that exist in that space.

Those are altered by the wave that crosses them but, that phenomenon only lasts the time takes to pass through, then the particles return to their natural state.

Final answer:

Acceleration is the rate of change of velocity over time. The acceleration of the air in m/s² when sneezing at 155 km/h in 0.70 s is approximately 61.51 m/s².

Explanation:

Acceleration is the rate of change of velocity over time. In this case, the air in your lungs accelerates from rest to 155 km/h in approximately 0.70 s. To calculate the acceleration in m/s², we convert the final velocity to m/s and use the formula for acceleration.

Given: Initial velocity = 0 m/s, Final velocity = 155 km/h = 43.06 m/s, Time = 0.70 s. Acceleration = (Final velocity - Initial velocity) / Time.

Substitute the values: Acceleration = (43.06 m/s - 0 m/s) / 0.70 s = 61.51 m/s².

Answer:

At the bottom of swimming pool the pressure will be maximum.

Explanation:

Here as we know that pressure inside the water is given as

[tex]P = P_0 + \rho g h[/tex]

here we know that

[tex]P_0[/tex] = atmospheric pressure

[tex]\rho[/tex] = density of water

h = depth inside the water where pressure it to be required

So here from the above equation we know that pressure is increased as the depth inside the water is increased.

So in order to have maximum pressure inside the swimming pool we need to go at maximum depth position.

So it is at the bottom of the swimming pool pressure will be maximum.

*100% CORRECT ANSWERS

Question 1

Climate warming trends allow plant and insect species to inhabit larger ranges.

True

Question 2

What is a possible consequence of climate change to species that have a narrow temperature tolerance range?  

all of the above

Question 3

Which of the following is not a possible effect of rising carbon dioxide levels on plants?

increased plant mortality

Question 4

How does an early onset of spring through climate change affect plants?

their growing and flowering season starts earlier and is longer

Question 5

Environmental factors can cause various changes in ecosystems. Which of the following would most likely have the greatest lasting effect on an ecosystem?

change to the landscape from construction

Question 6

How does change to an ecosystem that results in succession benefit the ecosystem?

it leads to an increased level of biodiversity

Question 7

How do the benefits of natural change to ecosystems compare to the disadvantages?

the benefits outweigh the disadvantages

Question 8

Environmental factors can have various effects on ecosystems. In August 2005, Hurricane Katrina caused significant damage in several states along the Gulf Coast, including Alabama, Mississippi, and Louisiana. Thousands of people were evacuated from their homes due to flooding and other damage caused by the storm. What environmental impact would Hurricane Katrina not have caused?

early onset of spring

Question 9

Rising levels of carbon dioxide most likely

have a greater detrimental effect on the sea

Question 10

Which scenario best describes how climate trends might affect animal migration?

animals found at the equator may move north

The magnitude of the velocity swung in uniform circular motion is equal 4 m/s.

Given the following data:

To calculate the magnitude of the velocity:

Mathematically, centripetal force is given by the formula:

[tex]F_c = \frac{mv^2}{r}[/tex]

Making v the subject of formula, we have:

[tex]V = \sqrt{\frac{F_c r}{m} }[/tex]

Substituting the parameters into the formula, we have;

[tex]V = \sqrt{\frac{4 \times 2}{0.5} }\\\\V = \sqrt{\frac{8}{0.5} }\\\\V =\sqrt{16}[/tex]

V = 4 m/s

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The two key properties of a telescope include its light gathering ability, allowing the viewing of faint and distant objects, and resolving power, which enables detailed viewing of closely spaced objects.

The two most important properties of a telescope are its light gathering ability and resolving power. The light gathering ability, determined by the diameter of the lens or mirror, allows the telescope to collect more light which means the telescope can see fainter objects. For example, larger telescopes can see more distant stars and galaxies.

On the other hand, the resolving power, or the ability to distinguish between two closely spaced objects, depends on the quality of the optics and the viewing conditions. This property allows for the detailed viewing of objects. For instance, a telescope with high resolving power can detail the rings of Saturn or the craters of the Moon.

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Answer:

Neutron

Explanation:

Neutron is an electrically neutral subatomic particle found in the nucleus of an atom.

Protron is an electrically positive subatomic particle found in the nucleus of an atom.

Electron is an electrically negative subatomic particle found in the orbital of an atom.

You throw a ball upward from a window at a speed of 1.5 m/s. Ball will be moving with velocity when it hits the sidewalk 2.6 m below is  7.3 ms⁻¹.

When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time. Uniform motion an object is said to have uniform motion when object cover equal distance in equal interval of time within exact fixed direction. For a body in uniform motion, the magnitude of its velocity remains constant over time.

Given in the question,

Initial Velocity (u)= 1.5 ms⁻¹

Final Velocity (v)=?

Acceleration=9.8 ms⁻¹ (remains constant on free fall problems)

Displacement (s)=-2.6 m

v² = u²+2as

v² = (1.5)²+2(-9.8)(-2.6)

v² = 53.21

v  = √53.21

v  = 7.2945 ≈ 7.3 ms⁻¹

Ball will be moving with velocity when it hits the sidewalk 2.6 m below is  7.3 ms⁻¹.

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Answer:

A physical quantity which is described completely by its magnitude only, is called a scalar quantity.

Examples- Velocity ,Temperature, Speed

Properties

The mass of a steel block with a volume of 600.0 cm3 and a density of 7.8 g/cm3 is 4680 grams, or 4.68 kilograms.

To calculate the mass of a block of steel given its density and volume, you use the formula mass = density  imes volume. Since the density of steel is given as 7.8 g/cm3 and the volume of the block is 600.0 cm3, you can find the mass by multiplying these two numbers together. Therefore, the mass of the steel block is 7.8 g/cm3  imes 600.0 cm3 = 4680 grams or 4.68 kilograms when converted to kilograms.

The options which are apply on it;

2. Some energy can be changed from one form to another.

4. The total initial energy will be equal to the total final energy.

7.Friction can cause the amount of thermal energy to increase.

Energy can not be created or destroyed it can only be converted from one form to another.

Final answer:

To calculate the theoretical yield of C2H5Cl in the reaction between ethane and chlorine, you need to determine the limiting reactant and use stoichiometry to calculate the yield.

Explanation:

The reaction between ethane (C2H6) and chlorine (Cl2) produces mainly ethyl chloride (C2H5Cl), but other products such as dichloroethane (C2H4Cl2) may also be formed in smaller quantities. These additional products reduce the overall yield of ethyl chloride. To calculate the theoretical yield of C2H5Cl, we first need to determine the limiting reactant. This is done by comparing the stoichiometric ratios of the reactants: C2H6 and Cl2.

The balanced chemical equation for the reaction is:
C2H6 + Cl2 → C2H5Cl + HCl

To calculate the theoretical yield of C2H5Cl, you can use the following steps:

The resulting value will be the theoretical yield of C2H5Cl.