What does it mean if an experiment is replicable? Why is it important that experiments be replicable? (Site 1)

I think it’s B but I might be wrong

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

I'm going to answer this by using rounded numbers for the atomic masses. You need only go back and put the numbers in from your periodic table. My answers will be close, but not what you should get.

Find the Molar Mass of MgCl2

Mg =                   24 grams

2Cl = 2 * 35.5 = 71 grams

Total  =              95 grams

Find the mols in 339 grams

1 mole = 95 grams

x mol = 339

Solve

339 = 95x   Divide by 95

339/95 = x

x = 3.67 mols  Answer

1. Metallic ; Nonmetallic  

2. Radioisotope  

3. Boils

4. Endothermic

5. Kinetic  

6. Alpha Particles

7. Highest

8. Scientific Model

9. Mass Number ; Atomic Number

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:

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

milk and water to scatter light

Answer:

an aquarium for the atmosphere and a lamp for the sun

Explanation:

study island

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

33.33 miles/hr

Average speed is the ratio of the total distance covered to time

That is; Speed = distance/time

In this case;

Distance = 100 miles and time =3 hours

                        = 100 miles/3 hours

                        = 33.33 miles/hr

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.

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.

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

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,

They ALL do.  

Every object with mass has a gravitational field ... just as long as its mass is somewhere between an electron and a supercluster of galaxies.

The gravitational force exerted by a body depends on its mass. Thus, greater the mass, greater will be the gravitational force. Therefore, sun exerts greater gravitational force.

Gravitational force is a kind force by which an object attracts other objects into its centre of mass. Earth gravitationally pull every objects into the ground that's why we are standing on the surface.

The force of gravitation is dependant on the mass and distance to the object. Objects with greater mass exerts greater gravitational force. However, the gravitational pull reduces over longer distances.

Sun exerts strong gravitational pull to its nearby objects than moon and earth, because, sun is massive. Therefore, a is correct. Moon also imparts a gravitational force but very less compared to that from sun.

To find more on gravitational force, refer here:

https://brainly.com/question/12528243

#SPJ2

Answer:

The correct option is C. Some benefits of extrinsic motivation  may increase appropriate social behavior and make uninteresting tasks worth pursuing.

Explanation:

Extrinsic motivation can be described as the courage to do a certain task due to some extrinsic rewards. The extrinsic rewards may be in the form of money, grades, fame etc. A person might change his bad habits or behaviours into good ones to gain fame and popularity. Similarly, tasks that have no values in our eyes may be done with much effort if an external reward is given for them.

Answer:

C is correct

Explanation:

Edge 2020

The heart and the circulatory system

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.

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

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!

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.)

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.

8. Picture B

Explanation:

There are 3 states of matter:

- Solid: in solids, atoms/molecules are bond together, so they are not free to move, they can just vibrate around their fixed positions. In solids, atoms/molecules are close and packed with each other

- Liquid: in liquids, atoms/molecules can move past each other, however there are still intermolecular forces that keep them close to each other

- Gas: in gases, atoms/molecules are totally free to move far from each other

In this case, atoms in the gas of a neon sign are represented by picture B, since there the atoms are very far from each other and free to move.

9. Picture C.

Explanation:

the picture that best represents a rock is picture C: in fact, we see that in picture C atoms are packed and close to each other, since it is a solid and atoms are bond to each other. So, picture C represents a solid, therefore it is the picture that best represents a rock.

it's C) stay in business

Answer:

The answer is C

Explanation:

Reorganization, permits debtors to stay in business.

Cosmic microwave background radiation

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:

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

If my math is right its A) 7

because 189 divided by 27 is 7

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

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]

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.