If you pipetted 20.00ml of a liquid into a pre weighted beaker and determined that this liquid had a mass of 34.719 what is its density?

Answer:

Density= 2.78 g/cm³

Relative density=2.8

Explanation:

To calculate the density of the cube we have to use the formula ρ=mass/volume

ρ stands for density.

So now we don't have the volume of the cube and to find the volume of the cube we have to use the formula a³

3³= 9 cm³

Now plug in the values. ρ= 25 g/9 cm³

ρ= 2.78 g/cm³

To find the relative density, we have to use the formula ρsample/ρH20

The sample means the density of the substance earlier. We do not know the density of water but it is constant at 997 kg/m³.

Now we have to make the units same so you change the unit of the density of cube to kg/m³

So, 25/1000= 0.025 kg

9/100×100×100 (because cm³ which means that there should be 3 meters to change the unit and to conver cm to meter we need to divide by 100 so 9cm/100, 9cm²/100×100, 9cm³/100×100×100)

=0.000009 m³

The new density= 0.025 kg/ 0.000009 m³

= 2777.78 kg/m³

Now plug the values into the formula:

relative density= 2.777.78 kg/m³ / 997 kg/m³

=2.8

There is no unit since kg/m³ and kg/m³ cancels

kinetic energy of an electron is approximately 0.962 eV.

A more detailed explanation of the answer.

The kinetic energy (in eV) of an electron with a de Broglie wavelength of 2.8 nm can be calculated using the following steps:
1. Convert the de Broglie wavelength to meters: 2.8 nm = 2.8 x 10⁻⁹ m
2. Use the de Broglie wavelength formula: λ = h / p, where λ is the wavelength, h is Planck's constant (6.626 x 10⁻³⁴ Js), and p is the momentum.
3. Rearrange the formula to find the momentum: p = h / λ
4. Calculate the momentum: p = (6.626 x 10⁻³⁴ Js) / (2.8 x 10⁻⁹ m) = 2.368 x 10⁻²⁵ kg m/s
5. Use the momentum to find the kinetic energy using the formula: KE = p² / (2m), where KE is the kinetic energy, p is the momentum, and m is the mass of the electron (9.109 x 10⁻³¹ kg).
6. Calculate the kinetic energy: KE = (2.368 x 10⁻²⁵ kg m/s)² / (2 x 9.109 x 10⁻³¹ kg) = 1.542 x 10⁻¹⁹ J
7. Convert the kinetic energy to eV: 1 eV = 1.602 x 10⁻¹⁹ J, so KE = 1.542 x 10⁻¹⁹ J / 1.602 x 10⁻¹⁹ J/eV = 0.962 eV

The kinetic energy of an electron with a de Broglie wavelength of 2.8 nm is approximately 0.962 eV.

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Answer:

The zone of which g (gravity) decreases with depth below the Earth's surface is the mantle, which is the layer of Earth in between the crust and the core. The mantle makes up around 84% of the Earth's volume, and extends from around 5 km below the Earth's surface to a depth of 2900 km.

The mantle is composed of solid rock, with the outermost parts of it being composed of more dense, rigid rock. As we go deeper into the mantle, the rock becomes increasingly less dense. The decrease in density along with the increase in pressure creates a decrease in g-force with depth. The decrease in g-force has been measured to continue down to a depth of 2,900 km, at which point the g-force levels off.

Starting from rest, the disc completes \(\theta\) revolutions after \(t\) seconds according to

\(\theta=\dfrac\alpha2t^2\)

with angular acceleration \(\alpha\). It completes 10 rev in 2 s, which means

\(10\,\mathrm{rev}=\dfrac\alpha2(2\,\mathrm s)^2\implies\alpha=5\dfrac{\rm rev}{\mathrm s^2}\)

Find the time it takes to complete 20 rev with this acceleration:

\(20\,\mathrm{rev}=\dfrac12\left(5\dfrac{\rm rev}{\mathrm s^2}\right)t^2\implies t=\sqrt8\,\mathrm s\approx2.83\,\mathrm s\)

so it takes approximately 0.83 s to complete 10 more rev.

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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Answer:

Explanation:

Overgrazing and woodcutting are responsible for most of the desertification of rangelands, cultivation practices inducing accelerated water and wind erosion are most responsible in the rain-fed croplands, and improper water management leading to salinization is the cause of the deterioration of irrigated lands.

Answer:

well,,,,, it detecs smok and the smoke its a trigger

Explanation:

The y-component of the force on the particle at the given position is 120 N.

The electric force on the particle is determined by applying Coulomb's law and work-energy theorem as shown below;

Fd = W

Where;

F = W/d

F = 60/0.5

F = 120 N

Thus, the y-component of the force on the particle at the given position is 120 N.

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In a photoelectric effect experiment, the stopping potential depends on what metal is being used as target and  the frequency of the incident light. Hence both (a) and (c) are correct.

Stopping potential refers to the potential required to inhibit the ejection of electron from the surface of metal, when the incident beam of energy is greater than the work potential of metal it is directed on.

Photoelectrons emit from a metal, when illuminated with light, with threshold frequency higher than that of metal, with a range of KE’s. The stopping potential is the voltage between a metal surface and a cathode placed near the surface in a vacuum that stops generating current. Then we can assume that the maximum KE of the photoelectron is KE(max) = eV(s). where V(s) is the stopping potential. Einstein theorized that a photon carries an energy equal to E(p) = hf, and that the minimum energy required for a photon to penetrate a surface is a constant called the "work function" of the metal W. rice field. KE(max)=hf-W, or eV(s) = hf-W.

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Answer:

200 N to the right

Explanation:

17.56 makes up the weight's x-component.

given that g=9.8

In this instance, the weight is a single force that can be separated into two separate components, one operating parallel to the slope F and the other acting perpendicular to the slope F. This applies to an object that is resting on a slope.

The x-component and y-component are the two parts that push right or left and up or down, respectively. Shadows and force components. The elements function on the coordinate axes mathematically as shadows of the force vector.

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We know, velocity = Displacement/Time

Therefore, Displacement= Velocity×Time

Here, displacement= 20×5 m = 100 m

Answer: 100 m

Gravity is a theory because it is an encompassing explanation of a natural phenomenon that is well accepted (option E).

Scientific theory is a coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed.

A theory in scientific terminology is a hypothesis confirmed by observation, experiment.

According to this question, it can be said that a gravity is a theory because it is as well or generally accepted explanation of a phenomenon that has be scientifically proven through experimentation.

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The  speed when it hits the ground is option (B) 15.5 m/s.

To determine the speed of the object when it hits the ground, we can use the principle of conservation of energy. The initial potential energy of the object is converted into kinetic energy as it falls.

The change in gravitational potential energy is given as ΔPE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height.

We know that ΔPE = 565 J, and the height h = 12.0 m.

Since the object is initially at rest, its initial kinetic energy is zero.

The total mechanical energy (sum of potential and kinetic energy) is conserved, so:

ΔPE = ΔKE

mgh = (1/2)mv^2

Here, m cancels out, giving:

gh = (1/2)v^2

Substituting the known values:

(9.8 m/s^2)(12.0 m) = (1/2)v^2

117.6 = (1/2)v^2

Dividing both sides by (1/2):

235.2 = v^2

Taking the square root of both sides:

v ≈ 15.33 m/s

Therefore, the speed of the object when it hits the ground is approximately 15.33 m/s.

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We have that the gas will occupy at a pressure of 800 torr if temperature is held constant a Volume of

\(V_2=0.18L\)

From the Question we are told that

Initial Pressure \(P_1=720\)

final Volume  \(V_1=200mL\)

Initial Pressure \(P_2=800\)

final Volume  \(V_2=?\)

Generally the equation for Boyle's law  is mathematically given as

\(P_1V_1= P_2V_2\)

Therefore

\(V_2=\frac{ P_1V_1}{P_2}\\\\V_2=\frac{ 720*200}{800}\\\\V_2=180mL\)

\(V_2=0.18L\)

The gas will occupy at a pressure of 800 torr if temperature is held constant a Volume of

\(V_2=0.18L\)

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The airplanes have the same effective cross sectional area and drag coefficient. Then, the ratio of drag force at the two densities is 2.3.

The drag force is an air resistance which resist the motion of objects passing through air. It is related to the density ρ, drag coefficient C, velocity v and area A as follows:

D = 1/2 ρCAv².

Here, C and A are the same then the ratio of the drag forces D1 and D2 at the two densities is:

D1/D2 = ρ1 v1²/ρ2 v2²

ρ1  = 0.38 kg/m³

ρ2 = 0.67 kg/m³

v1 = 1000 km/h

v2 = 500 km/h

Then the ratios of drag force is ;

D1/D2 =  0.38 kg/m³ × 1000 km/h / (0.67 kg/m³ × 500 km/h)

          = 2.3

Therefore, the ratio of drag force at the two densities is 2.3.

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When thermal energy is removed from particles, then the particles' kinetic energy decreases (Option D).

The expression particles' kinetic energy makes reference to the amount of motion energy (i.e. energy in movement) that contain the particles of an object, which depends on the temperature of the material.

In conclusion, when thermal energy is removed from particles, then the particles' kinetic energy decreases (Option D).

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Answer:

50 cm3 of 1M hydrochloric acid is a six-fold excess of acid. In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium (surface area becomes smaller) that causes the change in the rate.

Explanation:

The equation for the reaction is: magnesium + hydrochloric acid → magnesium chloride + hydrogen

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

Students follow the rate of reaction between magnesium and the acid, by measuring the amount of gas produced at 10 second intervals.

3 cm of magnesium ribbon typically has a mass of 0.04 g and yields 40 cm3 of hydrogen when reacted with excess acid. 50 cm3 of 1M hydrochloric acid is a six-fold excess of acid.

In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium (surface area becomes smaller) that causes the change in the rate.

If a graph of volume (y-axis) against time (x-axis) is drawn, the slope of the graph is steepest at the beginning. This shows that the reaction is fastest at the start. As the magnesium is used up, the rate falls. This can be seen on the graph, as the slope becomes less steep and then levels out when the reaction has stopped (when no more gas is produced).

The reaction is exothermic, but the dilute acid is in excess and the rise in temperature is only of the order of 3.5˚C. There is some acceleration of the reaction rate due to the rise in temperature. Some students might notice the flask becoming slightly warm and they could be asked how this would affect the rate of reaction, and how they might adapt the experiment to make it a ‘fair test’.

Additional information

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.

To solve this we must be knowing each and every concept related to Le Chatelier′s Principle. Therefore, when concentration of hydrochloric acid was changed. the concentration of product will also change.

When a stress is given to a chemical system in equilibrium, the equilibrium shifts to alleviate the tension, according to Le Chatelier′s Principle. In other words, it can anticipate the outcome of a chemical reaction with response to changes in temperature, concentration, quantity, or pressure.

While Le Chatelier's concept can be used to anticipate the reaction to a change from equilibrium, it doesn't explain why the system behaves as it does (at the molecular level).

Mg(s) + 2 HCl(aq) \(\rightarrow\) MgCl\(_2\)(aq) + H\(_2\)(g)

According to  Le Chatelier′s Principle, when concentration of hydrochloric acid was changed. the concentration of product will also change.

Therefore, when concentration of hydrochloric acid was changed. the concentration of product will also change.

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Answer:

the answer is ....angle of reflection

Answer:

•Walking briskly

• Running /jogging

•Dancing

•biking

Answer:

I would assume that the box slows down due to the frictional force between the floor and the box. In addition, the frictional force points opposite of the boxes motion. As we know, the box was given an initial speed, therefore, having an applied force. Hence, we can conclude that  the frictional force opposing the motion of the crate is equal to the applied force but acting in the opposite direction. This frictional force is called static friction. When we increase the applied force (push harder), the frictional force will also increase until it reaches a maximum value.

Hope that helps!

Answer:

\(\frac{n}{t} = 30\ photons/s\)

Explanation:

The radiated power can be given in terms of the wavelength as follows:

\(Rasiated\ Power = \frac{nE}{t} = \frac{nhc}{\lambda t}\)

where,

Radiated Power = 1.2 x 10⁻¹⁷ W

n = no. of photons = ?

h = plank's constant = 6.625 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s

λ = wavelength = 500 nm = 5 x 10⁻⁷ m

t = time

Therefore,

\(1.2\ x\ 10^{-17}\ W = \frac{n(6.625\ x\ 10^{-34}\ J.s)(3\ x\ 10^8\ m/s)}{(5\ x\ 10^{-7}\ m)(t) }\\\\\frac{n}{t} = \frac{1.2\ x\ 10^{-17}\ W}{3.975\ x\ 10^{-19}\ J}\\\\\frac{n}{t} = 30\ photons/s\)

Answer:

2Ca+ O2 ------> 2CaO

mark me as brainiest

Answer:

A. Neon and argon

General Formulas and Concepts:

Explanation:

Elements that have a full valence shell (the outermost shell), are in Group 18 of the Periodic Table.

Because their outermost shell is full, they are inert, meaning that they do not like to bond or react with other elements.

Therefore, these gases with a stable full valence shell are known as Noble Gases.

A. would be the correct answer.

Answer:argon and krypton

Explanation:

Noble gases

Answer:

1. Flexibility.

2. Muscular Fitness

3. Cardiovascular Fitness

4. Cardiovascular Fitness

5. Flexibility

6. Muscular Fitness

7. Cardiovascular Fitness

Answer:

Who knows the answer please I need the answer

The current through the long straight wire is 45.7 A.

The magnetic field produced by a long straight wire carrying a current is given by the formula B = (μ0I)/(2πr), where B is the magnetic field, μ0 is the permeability of free space, I is the current, and r is the distance from the wire. Rearranging the formula to solve for I, we get I = (2πrB)/μ0.

Substituting the given values, we have B = 1.70 T and r = 0.0370 m. The permeability of free space μ0 is a constant equal to 4π × 10⁻⁷ T·m/A. Thus, we can calculate the current I as I = (2π0.0370 m1.70 T)/(4π × 10⁻⁷ T·m/A) = 45.7 A.

Therefore, the current through the long straight wire is 45.7 A.

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The nfl caliber wide receiver that can reach a top speed of 10.0 m/s in only 2.4 s has an acceleration during this time of: 4.16 m/s²

The formula and procedure we will use to solve this exercise is:

a = (vf - vi) /t

Where:

Information about the problem:

Applying the acceleration formula we have:

a = (vf - vi) /t

a = (10.0 m/s - 0 m/s) /2.4 s

a = (10.0 m/s) /2.4 s

a = 4.16 m/s²

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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The potential energy of the monkey at the given position is 600.9 J.

Potential energy is the energy stored in a body that depends upon the relative position of various parts of the body.

It increases with increase in the height of the object above the ground level.

The potential energy of the monkey is calculated as follows;

P.E = mgh

P.E = mg (L sin43)

where;

Substitute the given parameters and solve potential energy of the monkey

P.E = (16.9)(9.8)( 5.32 x sin 43)

P.E = 600.9 J

Thus, the potential energy of the monkey at the given position is 600.9 J.

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