A scientist completely dissolves gaseous oxygen into a container of liquid water. Which of the following best describes the contents of the container after the oxygen has been dissolved?

A.
an element
B.
a solution
C.
a compound
D.
a substance

STUDY ISLAND

Answer:

a) [tex]U_{g} = 40\,J[/tex], b) [tex]\eta = 70\,\%[/tex], c) [tex]v = 20\,\frac{m}{s}[/tex]

Explanation:

a) The initial potential energy is:

[tex]U_{g} = (0.2\,kg)\cdot \left(10\,\frac{m}{s^{2}} \right)\cdot (20\,m)[/tex]

[tex]U_{g} = 40\,J[/tex]

b) The efficiency of the bounce is:

[tex]\eta = \left(\frac{14\,m}{20\,m} \right)\times 100\,\%[/tex]

[tex]\eta = 70\,\%[/tex]

c) The final speed of Danielle right before reaching the bottom of the hill is determined from the Principle of Energy Conservation:

[tex]K = U_{g}[/tex]

[tex]U_{g} = \frac{1}{2}\cdot m \cdot v^{2}[/tex]

[tex]v = \sqrt{\frac{2\cdot U_{g}}{m} }[/tex]

[tex]v = \sqrt{\frac{2\cdot (40\,J)}{0.2\,kg} }[/tex]

[tex]v = 20\,\frac{m}{s}[/tex]

Question:

What are the magnitudes of the  pulling force and the magnetic field

Answer:

The magnetic field strength is 2.7 T

The pulling force [tex]F_p[/tex] is 0.975 N

Explanation:

Here we have;

Length of wire, l = 10.0 cm = 0.1 m

Resistance of wire, R = 0.300 Ω

Speed of wire, v = 4.00 m/s

Power dissipated = 3.90 W

Based on the given data, we apply the relation;

[tex]I =\frac{Blv}{R}[/tex]..............(1)

Where:

B = Magnetic field strength

I = Current

Since P = I²R, we have;

3.9 = I²·0.300Ω

∴ I² = 3.9/0.300 = 13

From which I = √13

Substituting the value of I in equation (1) above, we have;

[tex]\sqrt{13}= \frac{B \times 10.0 \times 4.00}{0.300}[/tex]

Therefore;

[tex]B = \frac{\sqrt{13} \times 0.300}{0.1 \times 4.00} = 2.70416 \ T\approx 2.7 \ T[/tex]

The magnitude of the pulling force is given by the following relation;

[tex]F_p = F_m = IlB = l\sqrt{\frac{P}{R} } \frac{\sqrt{PR} }{lv} =\frac{P}{v} = \frac{3.9 \ W}{4.00 \ m/s} = 0.975 \ N[/tex]

The pulling force [tex]F_p[/tex] = 0.975 N.

Answer:

a) developed

b) simple

c) simple

d) developed

e) developed

f) developed

Question:

Which of the following sentences are simple sentences and which are developed sentences? Orally argue the answers

a) the cat scribbled the little girl.

b) Grandma will cook

c) The cat will spin

d) You don't love cats?

e) in one jump, the cat will be at the window

f) we will never arrived on time

Explanation:

To differentiate the simple sentences from the developed sentences, let's understand what they are.

A Simple sentence is a sentence that contain a subject and a predicate. The sentence is complete in thought.

A developed sentence is a sentence that contain a subject, predicate as well as other parts of sentence.

a) the cat scribbled the little girl (developed)

b) Grandma will cook (simple)

c) The cat will spin (simple)

d) You don't love cats? (developed)

e) in one jump, the cat will be at the window (developed)

f) we will never arrived on time (developed)

Hence option b and c are simple sentences, while options a, d, e and f are developed.

Answer:

I'll just assume that the question is what's the velocity of the airplane before it takes off because you haven't included a question. Where u: velocity, a: acceleration, t: time

[tex]u = a \times t \\ u = 2.5 \times 30 \\ u = 70ms[/tex]

Answer:D

Explanation:

Because I got it wrong

Answer:

The nuclear equation is give as [tex]\ce{^{235}_{92}U} + \ce{^{1}_{0}n} \rightarrow \ce{^{134}_{54}Xe} + \ce{^{100}_{38}Sr} + 2 (\ce{^{1}_{0}n})[/tex]

The number of neutrons produced = 2

Explanation:

Since the reaction is a neutron induced fission of Uranium, a certain amount of neutron will be emitted with Xe - 34 and Sr - 100

Therefore the nuclear equation is given as:

[tex]\ce{^{235}_{92}U} + \ce{^{1}_{0}n} \rightarrow \ce{^{134}_{54}Xe} + \ce{^{100}_{38}Sr} + y (\ce{^{1}_{0}n})[/tex]

To get the value of y:

Sum of mass numbers at the reactant = Sum of mass numbers at the product

235 + 1 = 134 + 100 + y

y = 236 - 234

y = 2

Therefore, the nuclear equation above becomes:

[tex]\ce{^{235}_{92}U} + \ce{^{1}_{0}n} \rightarrow \ce{^{134}_{54}Xe} + \ce{^{100}_{38}Sr} + 2 (\ce{^{1}_{0}n})[/tex]

As seen from the equation above, the number of neutrons produced in the reaction = 2

The nuclear equation for the neutron-induced fission of U-235 to form Xe-134 and Sr-100 is 235U + 1n → 134Xe + 100Sr + xn. The number of neutrons produced in the reaction can vary, but it is typically two or three.

The nuclear equation to describe the neutron-induced fission of U-235 to form Xe-134 and Sr-100 is:

235U + 1n → 134Xe + 100Sr + xn

Here, xn represents the number of neutrons produced in the reaction. The exact value of xn depends on the specific reaction and can vary. In general, the fission of U-235 produces two or three neutrons, each of which is capable of causing the fission of another nucleus.

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Answer:

It contracts and returns to its original length when it stops.

Explanation:

As it approaches the speed of light, the length of the object is observed to contract. Then as it comes to a stop, it returns back to its original length.

Answer:

Electromagnets.

Explanation:

They acquire their magnetism by flow of current and electromagnetic induction

The kind of magnet that should be shown in the figure is electromagnet.

An electromagnet refer to the type of magnet where the magnetic field is generated via an electric current. It comprise of wire wound into a coil. A current via the wire develops a magnetic field i.e. concentrated in the hole, represents the center of the coil. Also, it acquire their magnetism with the help of flow of current and electromagnetic induction.

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Genotypes describe the specific genetic makeup of a living thing and cannot be observed.

Genotypes represent the combination of alleles or genes that an organism possesses for a particular trait or set of traits. They are responsible for determining the inherited characteristics and potential traits that an organism can exhibit.

They can vary for different traits within an individual organism or across different individuals within a species. They play a fundamental role in genetics and inheritance, as they determine the genetic information that is passed from one generation to the next.

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The Answer is:

Weight

(hope that helped)

Answer:

Earth’s gravity causes the downward pull on the washers.

Explanation:

This is the sample answer on Edmentum. :)

Answer:

The net force in the middle particle is zero, and it has no direction.

Explanation:

First, the force that one charge does in other charge is:

F = K*q1*q2/r^2

where k is a constant, q1 and q2 are the charges, and r is the distance between the charges.

If the force is positive, the force is repulsive (pushes away the charge) if the force is negative, is attractive.

Now, we have that the middle charge has a charge of 4.00nC, and in each side at a distance of 4m, has a charge of 4.00nC.

i will write qL as the charge in the left, qR as the charge in the right, and qM as the charge in the middle.

The force that the charge in the right does to the charge in the middle is:

Fr = (k*(4.00nC)^2)/4m^2 = k*(nC/m)^2

And is positive, so this is a repulsive force, this means that if the charge is at the right of the middle charge, then this force pushes the middle charge to the left.

For the left charge we have the same:

Fl = (k*(4.00nC)^2)/4m^2 = k*(nC/m)^2

But in this case, the force pushes the particle to the right, then this force, that is equal in magnitude to the previous force, pushes it in the opposite direction, then the total force in the middle particle is anulated. This is because the two external particles are "pushing" the middle particle with the same force and in the opposite direction.

The net force in the middle particle is zero, and it has no direction.

[tex]F = K*q_1*q_2/r^2[/tex]

where,

k is a constant,

q1 and q2 are the charges, and

r is the distance between the charges.

If the force is positive, the force is repulsive (pushes away the charge) if the force is negative, is attractive.

Given :

Charge = 4.00nC

Distance = 4.00m

The force that the charge in the right does to the charge in the middle is:

[tex]F_r = (k*(4.00nC)^2)/4m^2\\\\F_r = k*(nC/m)^2[/tex]

And is positive, so that is a repulsive pressure, because of this if the charge is on the proper of the center fee, then this pressure pushes the center fee to the left.

For the left charge we have the same:

[tex]F_l = (k*(4.00nC)^2)/4m^2 \\\\F_l = k*(nC/m)^2[/tex]

But on this case, the pressure pushes the particle to the right, then this pressure, this is same in importance to the preceding pressure, pushes it within side the contrary direction, then the entire pressure within side the center particle is annulated. This is due to the fact the 2 outside debris are "pushing" the center particle with the identical pressure and within side the contrary direction.

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Answer:

C. Protons are positive, neutrons are neutral, and electrons are negative

The description that correctly labels each particle's charge is option C: Protons are positive, neutrons are neutral, and electrons are negative. These particles compose the anatomy of an atom.

The question asks for the correct assignment of charges to particles that make up atoms. The best description for each particle is given by option C. Here, protons are correctly labeled as positive, neutrons as neutral, and electrons as negative. In an atom, protons and neutrons reside in the nucleus (the center), while electrons occupy space around the nucleus, in what's known as electron clouds or shells.

Understanding the correct assignment of charges to atomic particles is fundamental in grasping the structure of atoms. Protons, carrying a positive charge, and neutrons, which are neutral, are concentrated in the nucleus, forming the central core. Meanwhile, electrons, negatively charged, orbit the nucleus in electron clouds or shells, contributing to the overall electrical balance of the atom.

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Astrology is a belief system which posits that the positions and movements of celestial bodies (the Sun, Moon, and planets) can influence human affairs and natural phenomena. Astrological practices involve the creation of horoscopes, which are detailed charts calculated based on the exact time, date, and location of an individual's birth, with the intention of gaining insight into personality traits, relationships, and life events.

The origins of astrology are rooted in ancient civilizations and can be traced back thousands of years. Early forms of astrology were used by the Babylonians as a method for predicting seasonal shifts and interpreting celestial cycles as omens. Horoscopes, central to natal astrology, detail the positions of the planets within the zodiac at the moment of one's birth, aiming to provide guidance or predictions. Critiques of astrology as a scientific practice point to a lack of empirical evidence and reproducibility, the Forer effect (subjects giving high accuracy ratings to vague and general personality descriptions), and the logical inconsistencies within astrological traditions which discredit its validity as a science.

Answer:

1.8m/s

Explanation:

We know that the momentum of an impact of a body is the mass times he velocity

M= mv

Given data

Mass m= 10kg

Momentum M= 18 kg.m/s

Velocity v=?

We can solve for velocity by submitting our given data in the momentum equation

18 = 10*v

v= 18/10

v= 1.8m/s

Answer: 1.8m/s

Explanation: bigger brain

Answer:

Decreased, The Same, 2.5 and .25

Explanation:

A heat engine is a device that uses heat to produce useful work.

Answer:

Heat

Explanation:

Answer:

(b) reflected back at you

Explanation:

Answer:

B) Reflected back at you.

Explanation:

Because of the smooth surface light reflects and bounces back to you making you see a reflected image of your self.

Hope this helped! Good luck and stay safe!!

Answer: [A] "by adding potential energy and kinetic energy"

Explanation: Mechanical Energy = Potential Energy + Kinetic Energy

Answer: d

Explanation:

Answer:

C) 4 seconds

Explanation:

The height of an object is given by the following formula:

[tex]s(t)=h+vt-0.5at^2\\\\a=32ft/s[/tex]

To find the flight time you equal the height s to zero:

[tex]0=5ft+70\frac{ft}{s}\ t-0.5(32\frac{ft}{s^2})t^2\\\\0=5ft+70\frac{ft}{s}\ t-16\frac{ft}{s^2}t^2[/tex]

Then, you have a quadratic equation of the form:

[tex]ax^2+bx+c[/tex]

you use the quadratic formula in order to find the roots of the polynomial:

[tex]t_{1,2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\\\\a=-16\\\\b=70\\\\c=5\\\\t_{1,2}=\frac{-70\pm \sqrt{(70)^2-4(-16)(5)}}{2(-16)}\\\\t_{1,2}=\frac{-70\pm 72.24}{-32}\\\\t_1=4.44s\approx4s\\\\t_2=-007s[/tex]

you take the positive value of t because this has physical meaning.

Hence:

the time is C) 4 seconds

From the data provided, the time taken for the baseball to hit the ground is 4.0 seconds

The function: s(t) = vt + h – 0.5at^2 represents the height of an object

From the data provided:

Substituting the values:

0 = 70t + 5 - 0.5(32)t^2

16t^2 -+ 70t - 5 = 0

solving quadratically:

[tex]t = \frac{ - b \sqrt{b {}^{2} - 4ac} }{2a} [/tex]

[tex]t = \frac{ - 70 \sqrt{ {70}^{2} - 4 \times ( - 16) \times 5} }{2 \times ( - 16)} [/tex]

t = 4.4 s or - 0.07

taking only positive values for t, t= 4 seconds

Therefore, the time taken for the baseball to hit the ground is 4.0 seconds.

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Answer:

D

Explanation:

Light travels in waves. It is also a particle. The dual nature of light as "both a particle and a wave" has been proved, its essential theory was further evolved from electromagnetics into quantum mechanics. Einstein believed light is a particle (photon) and the flow of photons is a wave.

Explanation:

Clear rendering reads;

"Make a table, like the one in the example, with the results obtained in the tests you carried out in previous activities. Then answer: What do these results indicate regarding your physical condition and how do they relate to your health? From your answers, consider the challenge of improving your physical condition by maintaining or improving your exercise routine or permanent practice of physical activity".

So the incomplete text above it seems you've been instructed to perform an experiment and then state your result/analysis.

The correct option is "work function of the photoemissive metal". The threshold frequency in a photoelectric effect experiment is most closely related to the work function of the photoemissive metal, which is the amount of energy required to eject an electron from the metal's surface.

The threshold frequency in a photoelectric experiment is closely related to the work function of the photoemissive metal (Option B). The threshold frequency is a characteristic of a metal and represents the minimum frequency of incident light required to eject electrons from the metal surface. If the frequency of the incident light is below this threshold, no photoelectrons are ejected regardless of the light's intensity or any other factors, such as the area or thickness of the metal.

In the case of using a metal with a lower threshold frequency (Option 3), this would correspond to a photoemissive metal with a lower work function, allowing electrons to be ejected with lower frequency (and thus, less energetic) light. Conversely, if a metal with a higher work function is used (Option 4), photons with energy less than this work function would not eject electrons, as their energy would be insufficient to overcome the electron binding energy inherent to the metal.

Answer:

1.6 N

Explanation:

Weight, W = mg where m = mass = 0.16 kg and g = 10 N/kg

W = mg = 0.16 kg × 10 N/kg = 1.6 N

Answer:

diffraction

Explanation:

Answer:

D they both have rocky surfaces

The earth and mars are similar to each other because both the planets have rocky surfaces. Thus, the correct option is D.

Earth and Mars are similar when it comes to their basic makeups, however it has been given that they are both the terrestrial type of planets. Earth and mars, both are differentiated between a dense metallic core and an overlying mantle and crust which are composed of less dense materials like silicate rocks.

Mars is about the half the size of the Earth by diameter and has a much thinner atmosphere, with an atmospheric volume which is less than 1% of the volume of the Earth. The atmospheric composition of the two planets are also significantly different because primarily they are carbon dioxide-based, while the Earth's is rich in nitrogen and oxygen gases.

Therefore, the correct option is D.

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Answer:

C. The light appears brighter

Explanation:

As the amplitude of a light wave increases, the light appears brighter.

The amplitude is the vertical distance from the axis of the sinusoidal wave at a particular time.

When the amplitude of a wave is increased, its energy is increased. Energy of the wave is directly proportional to the square of the amplitude. Energy is actually the intensity of the wave.

Thus, as the amplitude of a light wave increases, the light appears brighter.

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Answer:

the acceleration is 130.3m/s²

Explanation:

Given data

Force F= 18.9N

Mass of ball m= 0.145kg

Acceleration a=?

Applying the Newton's second law of motion

"The rate of change of momentum of a body is proportional to the external force".

F=ma

a= F/m

a= 18.9/0.142

a= 130.3m/s²

The acceleration of the baseball is 130.35 [tex]m/s^2[/tex].

Given the following data:

To find the acceleration of the baseball, we would apply Newton's Second Law of Motion:

Mathematically, Newton's Second Law of Motion is given by this formula;

[tex]Acceleration = \frac{Force}{Mass}[/tex]

Substituting the given values, we have;

[tex]Acceleration = \frac{18.9}{0.145}[/tex]

Acceleration = 130.35 [tex]m/s^2[/tex]

Therefore, the acceleration of the baseball is 130.35 [tex]m/s^2[/tex].

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Answer:

Explanation:

We shall apply law of refraction which is as follows

sin i / sinr = μ  , where i is angle of incidence , r is angle of refraction and μ is refractive index

here i = θa = 22.5°

r = θb

μ  = 1.77

sin22.5 / sinθb = 1.77

.3826 / sinθb = 1.77

sinθb = .216

θb  = 12.5 °.

Answer:

The correct option is;

C. 1,715 m

Explanation:

We are given the information from the group of teen at the City edge

Time of arrival of explosion sound = 5 s after sighting

Time of sighting explosion = 5 s before hearing the boom

Speed of sound in air ≈ 343 m/s

Speed of light = 299,792 km/s

Therefore, distance covered by sound in 5 seconds is given by the following equation;

[tex]Speed = \frac{Distance}{Time}[/tex]

[tex]\therefore 343 \ m/s= \frac{Distance}{5 \, s}[/tex]

Hence Distance = 343 m/s × 5 s = 1715 m

To check, we compare the time it would take for the light to cover 1715 m

That is [tex]Time = \frac{Distance}{Speed} = \frac{1715}{299,792,000} = 0.00000572 \, s[/tex] which is instantaneous hence the distance can be approximated by the time duration for the speed of sound.

Therefore, the distance of the students from the factory is approximately 1,715 m

Using the speed of sound at 24.0°C, which is roughly 343 m/s, and knowing the sound took 5 seconds to reach the observers, the calculated distance to the explosion is 1715 meters.

The question involves calculating the distance from an observed event based on the speed of sound, which falls under the subject of Physics. To determine how far the teens are from the factory, we can use the speed of sound, which depends on air temperature. Given the standard temperature of 24.0°C, the speed of sound in air is approximately 343 meters per second. The explosion sound reached the teens 5 seconds after they saw it, meaning the sound traveled for 5 seconds to reach them.

The distance can be calculated using the formula: distance = speed x time. Plugging in the values: distance = 343 m/s x 5 s = 1715 meters. Therefore, the teens were approximately 1715 meters away from the factory when they heard the explosion.