The best method for separating an oil and water mixture would be _____.

screening
magnetism
density
filtering

Using the given equation you get:

E = 1.99x10^-25 / 9.0x10^-6

Divide 1.99 by 9.0: 1.99/9.0 = 0.22

For the scientific notation, when dividing subtract the two exponents:

25 -6 = 19

So you now have 0.22 x 10^-19

Now you need to change the 0.22 to be in scientific notation form:

2.2 x 10^-20

The answer is B.

sodium is found in group one element, but flourine members of halogens . oxygen found in group six element ,but hydrogen found in group 1( according to periodic table)

Sodium and fluorine form ionic compounds based on their electron transfer, while oxygen and hydrogen bond covalently to create water, reflecting their differences in electronegativity and bonding mechanisms.

Comparing Sodium and Fluorine; Oxygen and Hydrogen

Sodium and fluorine differ in their electron configurations and bonding, resulting in ionic compounds, whereas oxygen and hydrogen can combine to form water through covalent bonding, demonstrating differences in electronegativity and molecular structure.

sodium (Na) is a metal with one valence electron which it readily loses to become a positively charged ion (Na+). Fluorine (F), on the other hand, is a non-metal with seven valence electrons and gains an electron to become a negatively charged ion (F-). When they bond, the resulting compound is ionic due to the high electronegativity difference. Oxygen (O2) and hydrogen (H2) both exist as diatomic molecules, but their contrast lies in the fact that oxygen is highly electronegative while hydrogen has a lower electronegativity, leading to a polar covalent bond when they form water (H2O).

while both pairs form stable compounds, the nature and type of bonding that occurs between sodium and fluorine, and oxygen and hydrogen, are fundamentally different due to their contrasting properties.

Passengers on the train, and flies on the passengers, can be sleeping or reading books. In their reference frames, the train is not moving.

Answer:

= 2

Explanation:

During nuclear fusion, two lighter nuclei of elements combine to form heavy nucleus and also energy is released;

During the process of hydrogen fusion a nucleus of deuterium is formed from two protons with emission of a neutrino.

In this case deuterium fuses with hydrogen nuclei to form helium-3 and also release energy.

That is;

2/1 H + 1/1 H = 3/1 He + energy

Formed where mantle erupts through crust

Answer:

The Hawaiian Islands were formed where mantle erupts through crust.

Explanation:

All the Hawaiian Islands were formed by the action of volcanoes that arose from the bottom of the sea, from a source of magma (hot spot).

Hawaii's hot spot theory holds that the tectonic plate under the Pacific moves, while the hot spot stands still, creating new volcanoes. For this reason, the volcanoes of the southern half of the island of Hawaii remain active today.

The oldest islands have inactive volcanoes, but in the newest ones volcanoes still active. The island of Hawaii has five volcanoes, and one of them is one of the most active in the world, the Kīlauea.

405j because kE=1/2mv^2

Answer: 405 J

Explanation:

i got it right on my exam

Answer:

the salt has a greater amount of charge

Explanation:

Answer:

0.10 m

Explanation:

The magnetic flux through the plane is given by

[tex]\Phi = BA[/tex]

where

B is the magnetic field intensity

A is the area of enclosed by the pipe

In this problem, we know

[tex]\Phi = 7.3\cdot 10^{-3} Wb[/tex] is the flux

B = 0.90 T is the magnetic field strength

Solving the equation for A, we find the area enclosed by the pipe

[tex]A=\frac{\Phi}{B}=\frac{7.3\cdot 10^{-3} Wb}{0.90 T}=8.1\cdot 10^{-3} m^2[/tex]

We know that the area is given by

[tex]A=\pi r^2[/tex]

where r is the radius. Solving for r, we find the radius:

[tex]r=\sqrt{\frac{A}{\pi}}=\sqrt{\frac{8.1\cdot 10^{-3} m^2}{\pi}}=0.05 m[/tex]

And so the diameter is twice the radius:

[tex]d=2r=2(0.05 m)=0.10 m[/tex]

Answer:

Option B is ur answer

Answer:

The answer is D

Explanation:

Resonance is a phenomenon that occurs when a body capable of vibrating is subjected to the action of a periodic force, whose frequency of vibration approaches the characteristic frequency of vibration (called resonance frequence) of said body. This is due a relatively small force applied in a repeated form, causing the amplitude of the oscillating system to become very large.

In other words, for the specific case of sound waves, this phenomenon occurs when the frequency of the  wave that is external to the system or body coincides with the resonance frequency (characteristic frequency that reaches the maximum degree of oscillation) of this system or body.

In these circumstances the body vibrates, progressively increasing the amplitude of movement after each successive actions of the force. However, this effect can be destructive in some rigid materials.

It is a celestial body constituted by ice, dust and rocks that orbit around the Sun, after having been altered by the Oort cloud; following different trajectories that can be highly eccentric elliptical (periodic trajectories), parabolic or hyperbolic.

One of the main characteristics of a comet is that it travels quite fast, on its way around the Sun and has a long tail, which always go in the opposite direction to the Sun (due to the radiation pressure of sunlight).

It is a small rocky body (smaller than a planet and larger than a meteoroid). Most of these bodies are orbiting between Mars and Jupiter in the region known as the asteroid belt; while others accumulate at Jupiter's Lagrange points, and others cross the orbits of the planets.

It is a fragment of the celestial body that moves through space, which is smaller in size to an asteroid. If it gets to enter the atmosphere of the Earth, it will start to burn by friction with it (combustion) and it will be called a meteor, while if it hits the surface, it will be called a meteorite.

Comets are loose collections of ice, dust, and small rocky particles whose orbits are usually very long and narrow

the hot chocolate in the large pot has more therma energy than the hot chocolate in the mug

Answer:

The hot chocolate in the large pot has more thermal energy than the hot chocolate in the mug.

The hot chocolate in the large pot has more average kinetic energy than the hot chocolate in the mug.

Explanation:

Thermal energy is defined as the energy posses by an object because of kinetic energy of atoms present in it.

These atoms moves in a great pace or more rapidly when heat is transferred to them hence more the heat more will be the kinetic energy of the material.

In this case, hot chocolate is in large pot and thus has more temperature than the other mug.

Which explains it has more kinetic energy as well as more thermal energy.

Answer:

It would be a neutralization reaction if i do believe so

Explanation:

A Acid and an Base Neutralize each other you have something too acidic you use a base to neutralize it and same goes for if it is too basic meaning you would use an acid to neutralize it.

Hope it helps =)

Answer: C) neutralization

Explanation:-

B. Ionization is a process in which the most loosely bound electron is removed from an isolated gaseous atom.

[tex]M\rightarrow M^++e^-[/tex]

C. Neutralization is a special type of double replacement reaction in which acid and base combines to form salt and water.

[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]

D. Redox is a chemical reaction in which oxidation and reduction tales place simultaneously.

[tex]M+N^+\rightarrow M^++N[/tex]

Answer:

Is a Series Circuit

Explanation:

The circuit shown in the image is a series circuit, is considered as a closed circuit meaning that only has one path for the current to flow with all light bulbs in a row, the voltage applied to the circuit is equal to each voltage drop in the light bulb, if any light bulbs blow out, the current will not flow because the circuit is broken and the remaining light bulb would turn off.

Answer:

B. acceleration rate

Explanation:

Answer:

B

Explanation:

Nuclear fission is the reaction in which the nucleus of a heavy atom, when bombarded with neutrons (or when capturing an incident neutron), becomes unstable and divides into two or more nuclei of lighter atoms, giving rise to a situation of greater stability. In this process that takes place in the atomic nucleus, neutrons, gamma rays and large amounts of energy are emitted.

In addition, several neutrons are produced that affect other fissile nuclei,and trigger more fission reactions that in turn generate more neutrons. Effect known as chain reaction.

Answer:

Oceanic crust is about 6 kilometers thick. It's composed of several layers, not including the overlying sediment. The topmost layer, about 500 meters thick, includes lavas made of basalt (that is, rock material consisting largely of feldspar and pyroxene).

Explanation:

The oceanic crust, which constitutes 55% of Earth's surface is largely made up of basalt, a type of volcanic rock. It forms from the cooling of lava and primarily includes elements such as silicon, oxygen, iron, aluminum, and magnesium. Conversely, the continental crust is mainly made up of a different kind of volcanic rock called granite.

The oceanic crust, which covers 55% of Earth's surface, is principally composed of a type of rock called basalt. Basaltic rocks are volcanic in nature, formed from the cooling of lava, and primary constituents include silicon, oxygen, iron, aluminum, and magnesium. The oceanic crust is mainly submerged under the oceans and averages about 6 kilometers in thickness.

On the contrary, the continental crust is predominantly made up of granite, a different variety of volcanic rocks, and it covers the remaining 45% of the Earth's surface. Both the oceanic and continental crusts exhibit a density approximately 3 g/cm³.

It's interesting to note that all volcanically produced rocks, including basalt and granite, are classified as igneous rocks, which are created when molten material solidifies. Additionally, the oceanic crust is among the youngest features on our planet due to the continuing seafloor spreading process which basically renews the oceanic crust over approximately 100 million years.

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Answer:

39.05 pounds at [tex]60.19^{\circ}[/tex]

Explanation:

To find the resultant force, we need to decompose each vector along the x- and y- directions. Let's do it:

Vector 1:

[tex]A_x = 25 \cdot cos 10^{\circ}=24.62[/tex]

[tex]A_y = 25 \cdot sin 10^{\circ}=4.34[/tex]

Vector 2:

[tex]B_x = 30 \cdot cos 100^{\circ}=-5.21[/tex]

[tex]B_y = 30 \cdot sin 100^{\circ}=29.54[/tex]

Resultant components:

[tex]R_x = A_x + B_x =24.62+(-5.21)=19.41[/tex]

[tex]R_y = A_y + B_y = 4.34+29.54 =33.88[/tex]

So the magnitude of the resultant is

[tex]R=\sqrt{R_x^2+R_y^2}=\sqrt{(19.41)^2+(33.88)^2}=39.05[/tex]

And the direction is

[tex]\theta=tan^{-1}(\frac{R_y}{R_x})=tan^{-1}(\frac{33.88}{19.41})=60.19^{\circ}[/tex]

The resultant force is found by summing the horizontal and vertical components of the two forces and then calculating the magnitude and direction of the resultant vector using the Pythagorean theorem and inverse tangent function respectively.

We can calculate the resultant force by breaking down each force into its horizontal and vertical components, summing these components and then calculating the magnitude and direction of the resultant force by applying principles of trigonometry and vector addition.

The first force of 25 pounds can be broken down into its horizontal and vertical components as follows: the horizontal component will be 25*cos(10°) and the vertical component will be 25*sin(10°).

Similarly, the second force of 30 pounds acts at an angle of 100°. Its components will be: the horizontal component as 30*cos(100°), and the vertical component as 30*sin(100°).

Now, the resultant force will have a horizontal component equal to the sum of the horizontal components of the two forces, and a vertical component equal to the sum of the vertical components of the two forces. Therefore, the horizontal and vertical components of the resultant force can be calculated as the sum of the respective components of the individual forces.

The magnitude of the resultant force can then be found by using the Pythagorean theorem, i.e., the square root of the sum of the squares of the horizontal and vertical components of the resultant force. The direction of the resultant force can be found using the inverse tangent function (atan or tan⁻¹) applied to the ratio of the vertical component to the horizontal component of the resultant force.

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The correct answer is B)

Final answer:

To double the kinetic energy of a gas molecule, the momentum must be increased by a factor of square root of 2 (B) √2.

Explanation:

If you want to double the kinetic energy of a gas molecule, by what factor must you increase its momentum, the answer is B) √2. Kinetic energy (KE) is given by the equation KE = ½mv², where m is the mass and v is the velocity of the molecule. Since momentum (p) is the product of mass and velocity (p = mv), we can express kinetic energy in terms of momentum as KE = p² / (2m).

Therefore, to double the kinetic energy (2KE), the equation becomes 2(½mv²) = mv², which implies that the new momentum (p') squared would be twice the original momentum squared (2p²). Taking the square root on both sides results in p' = p√2, so the momentum must be increased by a factor of the square root of 2 to double the kinetic energy of the molecule.

The average power if both the resistance and peak emf are doubled simultaneously is 10 W.

a)

The average power is:

[tex]P_{avg}=\frac{(V_{RMS})^2}{R} \\\\[/tex]

If the resistance is doubled. The new average power is:

[tex]P_{avg}'=\frac{(V_{RMS})^2}{2R}=0.5*\frac{(V_{RMS})^2}{R} =0.5*5=2.5\ W\\\\[/tex]

b)

[tex]P_{avg}=\frac{(V_{RMS})^2}{R}= \frac{(E_o/\sqrt{2} )^2}{R} \\\\\\\\[/tex]

If the peak emf is doubled:

[tex]P_{avg}'=\frac{(2E_o/\sqrt{2} )^2}{R}=4*\frac{(E_o/\sqrt{2} )^2}{R}=4*5=20\ W[/tex]

c)

[tex]P_{avg}=\frac{(V_{RMS})^2}{R}= \frac{(E_o/\sqrt{2} )^2}{R} \\\\\\\\[/tex]

If both are doubled simultaneously:

[tex]P_{avg}'=\frac{(2E_o/\sqrt{2} )^2}{2R}=2*\frac{(E_o/\sqrt{2} )^2}{R}=2*5=10\ W[/tex]

The average power if both the resistance and peak emf are doubled simultaneously is 10 W.

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Doubling the resistance halves the average power dissipated to 2.5W. If the peak emf is doubled, the average power becomes four times, which is 20W. If both are doubled simultaneously, Pavg becomes double the initial value, which is 10W.

Given, the average power Pavg dissipated by a resistor connected to a sinusoidal emf is 5.0 W. The expression for average power Pavg is given by Pavg = (Irms)^2R.

a) If the resistance R is doubled, the average power Pavg becomes halved, which is 2.5W as per the equation Pavg = (Irms)^22R.

b) If the peak emf E0 is doubled, then the average power becomes four times, as per the equation Pavg = 4*(Irms)^2*R, which means Pavg = 20W.

c) If both resistance R and peak emf E0 are doubled simultaneously, then Pavg doubles from the initial value, because, Pavg = 2*(Irms)^2*2R giving Pavg = 10W

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The farthest major planet from the sun is Neptune

Ernest Rutherford was a British physicist and chemist of New Zealand origin, who conducted a series of experiments together with Hans Geiger and Ernest Marsden; where the result led him to propose a new atomic model.

It should be noted that at that time, the "accepted" atomic model was Thomson's raisin pudding atomic model (electrons with negative charge immersed an the atom of positive charge that counteracted the negative charge of the electrons, like raisings embedded in a pudding), who discovered the electron and formerly was a professor of Rutherford.  

Now, the experiment conducted under the direction of Ruherford at the laboratories of the University of Manchester during the year 1911; was for the purpose of corroborating Thomson's atomic model. To achieve this, a thin metal sheet was bombarded with alpha particles (nuclei of helium gas).

The idea was that these alpha particles, having positive electric charge, were attracted by the atom's negative charges and repelled by the positive charges, and it was expected that they would pass through the thin sheet without hardly deviating. Then, to observe the crash site of the particle, a phosphorescent screen was placed behind and on the sides of the metal sheet.

For according to Thomson's atomic model the positive and negative charges were evenly distributed, the sphere (the atom) had to be electrically neutral, and the alpha particles would pass through the sheet without deviating.

However, the results were surprising:

As expected, most of the particles went through the sheet without deviating.

That is:

These facts could not be explained by Thomson's atomic model, so Rutherford developed another, suggesting that:

This new model could explain the proven fact in his experiments that some particles bounced in the direction opposite to the incident particles, because the electrical charge of this nucleus was positive, equal to the electrical charge of the alpha particles.

This is how Rutherford proposed a new atomic model and discovered the existence of the nucleus. However, this was not the definitive model, because on 1913 it was replaced by Bohr's.

1. 5765 mol

First of all, let's calculate the volume of the room (which corresponds to the volume of the gas):

[tex]V=7.00 m\cdot 8.00 m \cdot 2.50 m=140 m^3[/tex]

We also know the following data about the gas:

[tex]T=22.0^\circ +273 =295 K[/tex] is the temperature

[tex]p=1.00atm = 1.01\cdot 10^5 Pa[/tex] is the pressure

Then we can use the ideal gas law

[tex]pV=nRT[/tex]

with R being the gas constant

to find the number of moles of the gas:

[tex]n=\frac{pV}{RT}=\frac{(1.01\cdot 10^5 Pa)(140 m^3)}{(8.314 J/mol K)(295 K)}=5765 mol[/tex]

2. 184.5 kg

The molar mass of oxygen is

[tex]M_m = 32.0 g/mol[/tex]

this corresponds to the mass of 1 mol of oxygen.

In this problem, the number of moles is

n = 5765 mol

So the total mass of these n moles of oxygen will be:

[tex]m=n M_m = (5765 mol)(32.0 g/mol)=1.845\cdot 10^5 g=184.5 kg[/tex]

Answer:

I believe the answer is B, the paths of the planets follow an elliptical orbit around the sun.

Answer:

B. Paths of the planets follow an elliptical orbit around the sun.

Explanation:

As per Copernicus model of the universe he explained that all planets revolves around the sun in circular orbit with sun at the center of the of the path.

Now as per his theory Radius of orbit of all planets are different and the centripetal force provided by the sun for the circular path of the planets

Now as per his theory all planets must have to move with uniform speed around the sun but this was not true as we can see that the speed of all planets are different at different positions.

So here in order to correct his theory Kepler gives his law of planetary motion that all planets revolves around the sun in elliptical orbit with position of sun as one of its focus.

This path verify all the experimental results of planetary motion and hence correct answer will be

B. Paths of the planets follow an elliptical orbit around the sun.

Answer:

c)by a factor of four

Explanation:

The total energy of a simple harmonic oscillator is given by

[tex]E=\frac{1}{2}kA^2[/tex]

where

k is the spring constant of the oscillator

A is the amplitude of the motion

In this problem, the amplitude of the oscillator is doubled, so

A' = 2A

Therefore, the new total energy is

[tex]E'=\frac{1}{2}k(2A)^2=4(\frac{1}{2}kA^2)=4E[/tex]

So, the total energy increases by a factor 4.

a) zinc

The equation of the photoelectric effect is:

[tex]E=\phi + K[/tex] (1)

where

E is the energy of the incident light

[tex]\phi[/tex] is the work function

[tex]K[/tex] is the maximum kinetic energy of the emitted photoelectrons

Here the wavelength of the incident light is

[tex]\lambda=200 nm = 2\cdot 10^{-7} m[/tex]

so the energy of the light is

[tex]E=\frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{2\cdot 10^{-7} m}=9.95\cdot 10^{-19} J[/tex]

Converting into electronvolts,

[tex]E=\frac{9.95\cdot 10^{-19}}{1.6\cdot 10^{-19} J/eV}=6.22 eV[/tex] (2)

The stopping potential is the potential needed to stop the photoelectrons with maximum kinetic energy: so, the electrical potential energy corresponding to the stopping potential (V=1.93 V) must be equal to the maximum kinetic energy of the photoelectrons,

[tex]U=q V = K[/tex]

and since the charge of the electron is

1 q = 1 e

We have

[tex]K=(1 e)(1.93 V)=1.93 eV[/tex] (3)

Combining (1), (2) and (3), we find the work function of the material:

[tex]\phi = E-K=6.22 eV-1.93 eV=4.29 eV[/tex]

So, the cathode is most likely made of zinc, which has a work function of 4.3 eV.

b) The stopping potential does not change

As we said in part A), the stopping potential is proportional to the maximum kinetic energy of the photoelectrons, K.

The intensity of light is proportional to the number of photons that hit the surface of the metal. However, the energy of these photons does not depend on the intensity, but only on the frequency of the light.

Therefore, the energy of the photons (E) does not change when the intensity of light is doubled. Also, the work function [tex]\phi[/tex] does not change: this means that the maximum kinetic energy of the photoelectrons, K, does not change, and so the stopping potential remains the same.

If the intensity of light is doubled, the stopping potential is still  1.93 V.

The term photoelectric effect refers to the fact that electrons are emitted from the surface of a metal when it is irradiated with light of the appropriate frequency.

Now;

Kinetic energy = Energy of photon - work function

Energy of the photon = 6.6 * 10^-34 * 3 * 10^8/200 * 10^-9

= 9.9 * 10^-19 J

For the stopping potential or kinetic energy;

1 ev = 1.6 * 10^-19 J

1.93 eV = 1.93eV *  1.6 * 10^-19 J/1 ev = 3.1 * 10^-19 J

Work function of the metal = 9.9 * 10^-19 J - 3.1 * 10^-19 J

= 6.8 * 10^-19 J or 4.25 eV

The metal is zinc

We know that the stopping potential is independent of the light intensity hence if the intensity of light is doubled, the stopping potential is still  1.93 V.

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i think it’s asking for ultraviolet

Answer:

Ultraviolet Light

Explanation:

Answer:

[tex]v=\frac{d}{t}[/tex]

Explanation:

The average velocity of a moving object is given by:

[tex]v=\frac{d}{t}[/tex]

where

d is the displacement of the object

t is the time taken

In this problem, we have

d = 25 m is the displacement

t = 2 s is the time

Therefore, the average velocity of the seagull is

[tex]v=\frac{25 m}{2 s}=12.5 m/s[/tex]

Note that velocity is a vector, so it has not only a magnitude, but also a direction, which corresponds to the direction of the displacement (downward, in this example).

Definition

Acceleration is the term used to describe an object that is either speeding up or slowing down.

Explanation

Based on the given answer choices, answer choices A, C, and D does not describe an object either gaining speed or losing speed; however, object B states this. For this reason, answer choice B is the correct answer.

Answer

b. ac car slowing down on a sharp curve

Final answer:

Acceleration is any change in the velocity of an object, which includes speeding up, slowing down, or changing direction. The example of a car slowing down on a sharp curve is a clear illustration of acceleration.

Explanation:

The question: Which is an example of acceleration? involves understanding the concept of acceleration in physics. Acceleration refers to any change in the velocity of an object, which includes speeding up, slowing down, or changing direction. Therefore, the correct answer is b. a car slowing down on a sharp curve. This example perfectly illustrates acceleration because the car is changing its speed (slowing down) as it moves around the curve, which is a change in velocity. The other options, such as a pickup driving a constant distance in a specific time, an airplane traveling at a constant speed, or an 18 wheeler driving west at a constant speed, do not necessarily imply a change in speed or direction, and thus, do not serve as clear examples of acceleration.

A) Peak wavelength: 1.07 mm

The peak wavelength of the Cosmic Background Radiation can be found by using Wien's displacement law:

[tex]\lambda = \frac{b}{T}[/tex]

where

[tex]\lambda[/tex] is the peak wavelength

[tex]b=2.898\cdot 10^{-3}m\cdot K[/tex] is Wien's displacement constant

T is the absolute temperature

For the Cosmic Background Radiation,

T = 2.7 K

So the peak wavelength is

[tex]\lambda = \frac{2.898\cdot 10^{-3}m\cdot K}{2.7 K}=1.07\cdot 10^{-3} m=1.07 mm[/tex]

B) Peak frequency: [tex]2.8\cdot 10^{11}Hz[/tex]

The peak frequency can be found by using the relationship:

[tex]f=\frac{c}{\lambda}[/tex]

where

[tex]c=3.0\cdot 10^8 m/s[/tex] is the speed of light

[tex]\lambda[/tex] is the peak wavelength

Substituting numbers, we find

[tex]f=\frac{3.0\cdot 10^8 m/s}{1.07\cdot 10^{-3} m}=2.8\cdot 10^{11}Hz[/tex]