could you please help,my question 8 -9 and please show your work​

The heart and the circulatory system

its either 288Watts or 112.5 Watts

Answer:

The pressure of the gas will be increased to 450 kilo pascals.

Explanation:

Since the temperature is kept constant, the volume and pressure will be related by Boyle's Law.

According to the Boyle's Law, the product of pressure and volume of a gas remains constant provided that the temperature remains constant.

Mathematically this cab be expressed as:

[tex]P1V1 = P2V2[/tex]

Using the given values,

P1 = 300 kilo pascals

V1 =75 L

P2 = ?

V2 = 50 L

[tex]300 \times 75 = 50 \times P2\\ \\P2 = \frac{300 \times 75}{50}\\\\ P2= 450[/tex]

This means the pressure of the gas will be increased to 450 kilo pascals.

14. Reactants:

Magnesium Chloride: [tex]Mg Cl_2[/tex], since magnesium (Mg) has 2 valence electrons while chlorine (Cl) has 1 vacancy, so they are in ratio 1:2

Sodium oxide: [tex]Na_2 O[/tex], since sodium (Na) has 1 valence electron while oxygen (O) has 2 vacancies, so they are in ratio 2:1

15. Products:

Magnesium oxide: [tex]Mg O[/tex], since magnesium (Mg) has 2 valence electrons and oxygen (O) has 2 vacancies, so they are in ratio 1:1

Sodium chloride: [tex]NaCl[/tex], since sodium (Na) has 1 valence electron and chlorine (Cl) has 1 vacancy, so they are in ratio 1:1

16: Balanced reaction:

[tex]Mg Cl_2 + Na_2 O \rightarrow Mg O+2NaCl[/tex]

we see that on the reactant side we have: 1 atom of Mg, 2 atoms of Cl, 2 atoms of Na and 1 atom of O. By putting a 2 in front of NaCl, we have exactly the same on the product side: 1 atom of Mg, 2 atoms of Cl, 2 atoms of Na and 1 atom of O.

17. It is a double-replacement reaction

A double-replacement reaction occurs when two ionic compounds exchange their ions. In this specific case, we see that the Chlorine (initially bond with the magnesium) is then bond with the sodium, while the oxygen (initially bond with the sodium) after the reaction is bond with the magnesium.

Answer: a

Explanation:

The following combination is not feasible to be in equilibrium : 10,10,10

The correct option is A.

A state in which opposing forces or influences are balanced is called equilibrium.

The addition of two smaller forces must be greater than the third force in case of three forces to be in equilibrium.

For A: 10 + 10 >10 or 20 > 10

For B: 10 +5 <17 or 15 <17

For C: 5 +10 > 12 or 15 >12

For D: 5 +12 >13 or 17 >13

So, the gap between the magnitude of balancing forces is very high in (10,10,10).

Thus, the correct option is A.

Learn more about equilibrium.

https://brainly.com/question/12262457

#SPJ2

milk and water to scatter light

Answer:

an aquarium for the atmosphere and a lamp for the sun

Explanation:

study island

the thick part of the earth's crust that forms big landmasses. It is generally older  than the oceanic crust.

Continental crust is the layer of igneous, sedimentary, and metamorphic rocks that forms the continents and the areas of shallow seabed close to their shores, known as continental shelves.

mafic or intermediate

Descabezado Grande is a composite volcano primarily composed of intermediate andesite lava.

The volcano Descabezado Grande is characterized by a composite of various eruption styles, including low viscosity mafic magma and higher viscosity felsic lava, but it is most commonly composed of intermediate andesite lava. This composition places it within the category of composite volcanoes, also known as stratovolcanoes, which feature steep sides and are made of alternating layers of pyroclastic materials and lava flows. The composition of the magma is crucial for determining the volcano's eruptive behavior and landform shape, with intermediate magmas having properties that are in between those of mafic and felsic magmas. Descabezado Grande's magma, being primarily intermediate, indicates a mix of characteristics that contribute to its explosive eruption style and the formation of steep slopes.

If light is traveling through a medium (i.e. air), the color of light depends on the wavelength.

The following are wavelength intervals of colors on the visible light spectrum. Measured in nanometers (nm).

Red: 700–635 nm

Orange: 635–590 nm

Yellow: 590–560 nm

Green: 560–520 nm

Blue: 490–450 nm

Violet: 450–400 nm

If an experiment is replicsble it means that anybody can repeat the experiment and get the same results. It is important that experiments be replicable because if someone else can't repeat what you did, you might have made a mistake. Peer review is what scientists use.

hope this helps

A replicable experiment can be repeated under the same conditions to provide similar results. This is crucial in the scientific method as it ensures reliability of results, allows for verification of the findings, and helps weed out false claims. The inability to replicate an experiment often leads to questioning the credibility of the initial study.

When an experiment is replicable, it means the experiment can be repeated by others under the same conditions and produce the same or very similar results. This ability to reproduce results is one of the essential features of the scientific method, which is used in various fields of academic research, including physics, chemistry, biology, and psychology.

Replicability is essential for several reasons. First, it ensures the reliability of results. Results that are repeated in independent replications are considered more reliable because they have been tested and verified multiple times. Second, replication allows other researchers to check for any mistakes in the original study. Third, successful replications of research provide more evidence to support the original findings, leading to a wider acceptance of the results within the scientific community.

Conversely, if subsequent studies cannot replicate the findings, it may call the credibility of the original research into question.

Through this rigorous process of repeated testing, scientific knowledge advances as false claims are weeded out and factual information is reinforced.

https://brainly.com/question/1646340

#SPJ3

C) Infrared.

The wavelength of the "primary" (a.k.a. "peak") outgoing radiation from the earth depends on the surface temperature of the earth.

[tex]\displaystyle \lambda_\text{peak} = \frac{0.00289}{T}[/tex],

where

The average temperature on the earth is around 15 °C (around 60 °F.)

Convert to degrees Kelvins:

[tex]T = 15\;\textdegree\text{C} = (15 + 273.15)\;\text{K} = 288.15\;\text{K}[/tex].

Peak wavelength:

[tex]\displaystyle \lambda_\text{peak} = \frac{0.00289}{288.15} = 1.00\times 10^{-5} \;\text{m} = 1000\;\text{nm}[/tex].

What kind of electromagnetic radiation is that? Refer to a chart of the EM spectrum.

Radiations:

[tex]\lambda \approx 1000\;\text{nm}[/tex] is longer than the wavelength of visible light. The radiation is infrared (IR.)

it's C) stay in business

Answer:

The answer is C

Explanation:

Reorganization, permits debtors to stay in business.

Cosmic microwave background radiation

The voltage across an inductor ' L ' is

V = L · dI/dt .

I(t) = I(max) sin(ωt)

dI/dt = I(max) ω cos(ωt)

V = L · ω · I(max) cos(ωt)

L = 1.34 x 10⁻² H

ω = 2π · 60 = 377 /sec

I(max) = 4.80 A

V = L · ω · I(max) cos(ωt)

V = (1.34 x 10⁻² H) · (377 / sec) · (4.8 A) · cos(377 t)

V = 24.25 cos(377 t)

V is an AC voltage with peak value of 24.25 volts and frequency = 60 Hz.

See this suggested solution.

1. Let a force F' is the vector sum of the forces P and Q, then it is shown on the attached picture and marked with red color.

2. according to the condition the force F holds the object, then F should have the same length as the force F' and the opposite direction.

3. using the conditions described in 2. the answer is C.

12: Helium

Explanation:

In the picture:

- Red particles correspond to protons (because they are in the nucleus and they are positively charged)

- Green particles correspond to neutrons (because they are in the nucleus and they are uncharged)

- Yellow particles correspond to electrons (because they orbit the nucleus and they are negatively charged)

This atom as 2 protons and 2 electrons. This means it corresponds to the 2nd element in the periodic table (atomic number = 2), so it corresponds to helium.

13:  Electrons should be arranged in 3 separate orbitals: 2 electrons in an orbital closer to the nucleus, another 2 in a second orbital, and the remaining 3 in the last orbital

Explanation:

The electron configuration for nitrogen is:

[tex]1s^2 2s^2 2p^3[/tex]

which means:

[tex]1s^2[/tex] --> the closest orbital to the nucleus, energy level = 1, orbital s, containing 2 electrons

[tex]2 s^2[/tex] --> second closest orbital to the nucleus, energy level = 2, orbital s, containing 2 electrons

[tex]2p^3[/tex] --> third closest orbital to the nucleus, energy level = 3, orbital p, containing 3 electrons

Shield volcanoes are typically tall and broad, with flat, rounded shapes. They typically have a 5°-10° slope, and are typically made by lava flowing at a low viscosity (lava flowing easily), and their broad profile is typically built with flow after flow of relatively basaltic lava issuing from vents or fissures on the surface.

I hope this helps, I got a bit confused on the composition part as well.

Shield volcanoes usually have a broad shape, gentle slope and a basaltic composition.

Shield volcanoes are very known for their expansive and gently sloping profiles which are predominantly composed of basaltic lava. Their distinctive form arises from the eruption of low-viscosity magma which flows easily across the landscape.

These volcanic giants do stretch across tens of kilometers in diameter, with their broad and shield-like appearance earning them their name. The effusive nature of their eruptions characterized by the steady release of lava, contributes to their gradual slopes.

Read more about Shield volcanoes

brainly.com/question/16563

#SPJ3

Answer:

option (A) is correct

Explanation:

The taken to complete one full cycle of motion on a spring is called its period or time period.

It is denoted by T and its SI unit is second.

The number of oscillations completed in one second is called frequency. It is denoted by f and its SI unit is Hertz.

Period is the reciprocal of frequency.

The maximum displacement from its mean position is called amplitude. Its SI unit is metre.

Answer:

A is correct

Explanation:

TLDR: R=30 Ohms, I=2 Amps, 12V, 28V, 20V, respectively.

Alright, let’s break this down. There are three resistors in this circuit, meaning that we have to find the equivalent resistance. Luckily, they are all in parallel with one another; this means we can add the resistances together without having to do inverses like in a series problem. This means that the equivalent resistance, Req, would equal:

Req=R1 + R2 + R3

Req=6 + 14+ 10

Req=30 Ohms

This means that we could theoretically replace all three resistors with a 30 Ohm resistor and accomplish the same goal. Now, the entire voltage of the system would normally be reduced to zero after passing through the resistors - in this case, the 60 Vs would be lost after passing through 30 Ohms. This means we’re losing 2V/Ohm; now we can figure out how much we’re losing at each resistor.

By losing 2V per Ohm, we’re losing 12 V at the first resistor, 28 V at the second resistor, and 20 V at the third resistor.

Finally, we can calculate the current through the circuit; for a series circuit, the current remains the same. Using V=IR, we can find that:

V=IR

60 V = I(30 Ohms)

I = 2 Amps

The current passing through the circuit is 2 Amps.

Hope this helps!

Answer:

b. 4

Explanation:

The electric force between two charged objects is given by:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1 and q2 are the charges of the two objects

r is the separation between the two objects

In this problem, we have that the charge of one object is quadrupled:

[tex]q_1'=4q_1[/tex]

while all the rest remain unchanged. So the new electric force between the two objects is

[tex]F'=k\frac{q_1' q_2}{r^2}=k\frac{(4q_1) q_2}{r^2}=4 k\frac{q_1 q_2}{r^2}=4F[/tex]

So, the force will quadruple as well.

Answer:

B

Explanation:

The statement, which matches the scientists to their research in atomic theory is this: RUTHERFORD USED GOLD FOIL, THOMSON DISCOVERED ELECTRON. THUS THE CORRECT OPTION IS C.

Rutherford gold foil experiment was a landmark atomic experiment, which prove that every atom has a positive center that is called nucleus. With this experiment, Ernest Rutherford was able to establish the atomic nuclear theory.

J.J. Thomson was the scientist, who discovered the electron in 1897, when he was experimenting with the cathode ray. He was able to demonstrate that cathode ray was made up of negatively charged particles, which he called electrons.

Answer:

[tex]1.9 kg/m^3[/tex]

Explanation:

The density of an object is given by

[tex]d=\frac{m}{V}[/tex]

where

m is the mass of the object

V is its volume

In this problem,

m = 42 kg

V = 22 m^3

Substituting into the equation, we find the object's density:

[tex]d=\frac{42 kg}{22 m^3}=1.9 kg/m^3[/tex]

Some stars are smaller than our sun.

Stars are not flat circles.

Stars ARE made of gas.

Star color IS related to temperature.

The shape of the star does not effect it's brightness.  Only the size.

Size and temperature effects a stars brightness so.

3, and 4

Have a good day

The statements accurately describe stars are stars are made of gas and star color is related to temperature.

Stars are the small shiny part of the universe. They are billions in number. They collectively form the galaxies along with gases and dust.

Only some stars have size smaller than the Sun. Stars are spherical but not flat circles.

Stars are majorly made of gas. Star color depends on the temperature.

The shape of the star does not effect the brightness. The size and temperature effects a stars brightness.

Learn more about stars.

https://brainly.com/question/11948445

#SPJ2

A) 0

because all of the forces cancel out, so it is not moving with balanced forces.

Answer:

0 Newtons

Explanation:

As you can see in the image all of the forces that are contrary or opposite to one another have the same magnitude, that makes them cancel out, in order for an object to move the force applied most be greater than the force that is setting it at rest, usually the friction, unless one of this forces si greater than the other the object won´t move, so the net force acting on the object will be 0,

1. Metallic ; Nonmetallic  

2. Radioisotope  

3. Boils

4. Endothermic

5. Kinetic  

6. Alpha Particles

7. Highest

8. Scientific Model

9. Mass Number ; Atomic Number

Since Jason plays a lot of sports (D), there's a good chance that he has developed a greater-than-average lung capacity.  This is a good thing.

Jason likely took fewer breaths to blow up his balloon because he plays a lot of sports, which can lead to a higher lung capacity. This is not a definite answer, as other factors outside of the given options could also influence lung capacity.

The most probable reason, among the options given, why Jason took fewer breaths to blow up his balloon is option D: Jason plays a lot of sports. People who regularly engage in sports and physical activity often develop powerful lungs and a higher lung capacity. This means they can hold more air in their lungs at any given time, so they would need fewer breaths to blow up a balloon compared to those with lesser lung capacity. Please note, though, that there may be other factors not listed in the options that could affect how many breaths it takes to blow up a balloon.

https://brainly.com/question/34329157

#SPJ2

1) A chemical change is used by scientists to create new substances, and a physical change happens naturally. A chemical change results in a new substance being formed; whereas, a physical change will result in a different state of matter.

Answer:

Chemical changes involve the formation of a new substance.

Explanation:

The main difference between chemical and physical changes is the fact that chemical changes involve the formation of a new substance. When a physical change occurs, this does not lead to bonds being broken or formed. The properties of the elements involve do not change. This includes changes such as changes of state. On the other hand, a chemical change is one in which bonds are broken or formed. Therefore, the elements that are present are turned into a new substance.

I think the answer is B...

If an object is traveling with a constant velocity, there is no net force on the object.

If an object is traveling with a constant velocity, it means the object is moving in a straight line with a constant speed. In this case, the correct ending for the sentence is B. There is no net force on the object. This is because an object moving with a constant velocity experiences balanced forces, where the forces in all directions cancel each other out. Therefore, the object continues to move with the same velocity.

https://brainly.com/question/33267484

#SPJ6

The faster the particles are moving, the more energy they have. Temperature is the average amount of energy of motion of each particle of a substance. That is, temperature is a measure of how hot or cold a substance is. In contrast, the total energy of motion in the particles of a substance is called thermal energy.

The total energy of all the particles in a substance is called the internal energy (U) or symbolized as E. It is the sum of the kinetic energies and potential energies of the system's constituent particles.

The total energy of all the particles within a substance is referred to as the internal energy, often denoted as U or E. This internal energy encompasses both kinetic and potential energy, and it plays a crucial role in understanding the behavior and properties of substances.

1. Kinetic Energy: This component of internal energy is attributed to the motion of the particles within the substance. It includes various forms of motion, such as translational (linear motion), vibrational (vibrational motion of atoms or molecules within a structure), and rotational (rotational motion of molecules). The kinetic energy is directly related to the temperature of the substance, as an increase in temperature leads to higher kinetic energy of the particles.

2. Potential Energy: The potential energy component arises from the relative positions of particles within the substance, their interactions, and the conditions of the system. This can encompass various forms of potential energy, such as chemical potential energy (related to chemical bonds and reactions) and intermolecular potential energy (associated with attractive and repulsive forces between particles). Changes in potential energy can result from changes in the arrangement or composition of particles.

Together, these components contribute to the overall internal energy of the system, influencing its thermodynamic properties and behavior. Understanding the interplay between kinetic and potential energy is fundamental in fields like thermodynamics and chemistry, as it helps elucidate the physical and chemical transformations of substances.

https://brainly.com/question/33715835

#SPJ3

Stars are made of gas, and star color is related to temperature. Hope this helps and have a good day. :)

Answer:

3.Stars are made of gas.

4.Star color is related to temperature.

Explanation: