What statement is TRUE about all the substances listed in the data table? A) All the substances conduct electricity. B) All the substances are strong electrolytes. All the substances have high dissociation constants. D) All the substances contain an equal amount of ions in solution. Eliminate
Answers
Answer:
A) all substance conduct electricity
Related Questions
How many days makes 20 years (show all workings).
Answers
Answer:
20*365=7300
Explanation:
1 Year=365day
20years = x days
median of 18 24 17 21 24 16 29 18
Answers
Answer:
19.5
Explanation:
16,17,18,18,21,24,24,29
(fourth (18) and fifth(21)) ÷2=
(18+21)÷2=
39÷2=
19.5 is median
A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 30.00. Part of the beam is transmitted and part is reflected. Determine the angle between the reflected and transmitted rays
Answers
Answer:
130.528779365 degrees
Explanation:
The angle of incidence is 30 degrees. From this, we can use Snell's Law to calculate the angle of refraction.
n1/n2 = sin(theta2)/sin(theta1)
let theta1 be 30 degrees, and n1 be the refractive index of air = 1
1/1.5 = sin(theta2)/sin(30deg)
solve:
sin(theta2) = 2/3 sin(30deg) = 1/3
theta2 = arcsin (1/3) = 19.4712206345 degrees
The angle of reflection will always be equal to the angle of incidence, in this case, 30 degrees.
Because these angles are measured relative to the normal, the angle formed between the two rays is the difference between the normal line (180 degrees) and the sum of the two angle measures.
Angle between = 180-30-19.4712206345 = 130.528779365 degrees
The angle between the reflected and transmitted rays 130.5287 degrees
What is the refraction of light?The angle of incidence is 30 degrees. From this, we can use Snell's Law to calculate the angle of refraction.
\(\dfrac{n_1}{n_2} = \dfrac{sin(\theta_2)}{sin(\theta_1)}\)
let \(\theta_1\) be 30 degrees, and n1 be the refractive index of air = 1
\(\dfrac{1}{1.5} = \dfrac{sin(\theta_2)}{sin(30)}\)
solve:
\(sin(\theta_2) = \dfrac{2}{3} sin(30) = \dfrac{1}{3}\)
\(\theta_2 = sin ^{-1}\dfrac{1}{3} = 19.4712 \ degrees\)
The angle of reflection will always be equal to the angle of incidence, in this case, 30 degrees.
Because these angles are measured relative to the normal, the angle formed between the two rays is the difference between the normal line (180 degrees) and the sum of the two angle measures.
Angle between = 180-30-19.4712206345 = 130.528779365 degrees
Hence the angle between the reflected and transmitted rays 130.5287 degrees
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A person whose near-point distance is 45.5 cm wears a pair of glasses that are 2.1 cm from her eyes. With the aid of these glasses, she can now focus on objects 25 cm away from her eyes.
Required:
a. Find the focal length of her glasses.
b. Find the refractive power of her glasses.
Answers
Answer:
a
\(f = 0.4848 \ m\)
b
\(p = 2.063 D\)
Explanation:
From the question we are told that
The near point distance is \(k = 45.5 \ cm\)
The distance of the glasses from the eye is \(y = 2.1 \ cm\)
The distance of an object she can focus with the glass is \(i= 25 \ cm\)
Generally the image distance is mathematically evaluated as
\(v = -(45.5 - 2.1)\)
\(v = -43.4 \ cm\)
Generally the object distance is mathematically represented as
\(u = (25 -2.1)\)
\(u = 22.9 \ cm\)
The negative sign tells us that the image was formed behind the eye
Generally the lens formula is mathematically represented as
\(\frac{1}{f} = \frac{1}{u} + \frac{1}{v}\)
=> \(\frac{1}{f} = \frac{1}{22.9} + \frac{1}{ - 43.4}\)
=> \(f = 48.48 \ cm\)
converting to meters
\(f = 0.4848 \ m\)
Thus the refractive power is mathematically represented as
\(p = \frac{1}{f}\)
=> \(p = \frac{1}{0.4848 }\)
=> \(p = 2.063 D\)
How much work will it take to lift a 2-kg pair of hiking boots 2 meters off the
ground and onto a shelf in your closet?
O A. 2.45 J
B. 4J
C. 39.2 J
D. 20 J
Answers
Answer:39.2 (B)
Explanation:
Imagine that you're doing an experiment to determine how the running speed of a hamster depends on the weight of the hamster when plotting your data what variable should be on the y-axis
Answers
The variable on the y-axis should be the running speed of hamsters since it is the dependent variable.
What is the dependent variable?The dependent variable is the variable whose value fluctuates depending on other variables in an experiment.
In this case, the running speed is the dependent variable because it depends on the weight of the hamster.
The dependent variable is generally graphed on the Y axes, whereas the independent variable is graphed on the X-axes.
In conclusion, the variable on the y-axis should be the running speed of hamsters since it is the dependent variable.
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(10) An astronaut at Earth's surface has a mass of 50 kg and a weight of 500 N. If she were
floating freely inside a space habitat in remote space, she would have
A) no weight and less mass.
B) no weight and the same mass.
C) more weight and no mass.
D) none of the above
Answers
Answer:
we use formula is =W=mg
Sam wants to upgrade his toy "golf ball launcher". Right now when he shoots the toy vertically,
the golf ball reaches a height of 1.75 m. A golf ball has a mass of 46 grams and the toy can
hold a spring that can be compressed 24 cm. Using a different spring, Sam believes he can
increase the distance it can be compressed to 32 cm. What spring constant will Sam need the
new spring to be if he wants it to launch the golf ball vertically to a height of 3.0 m?
Answers
The initial kinetic energy of the golf ball can be found using:
KE = (1/2)mv^2
where
m = 0.046 kg (mass of golf ball)
v = ? (velocity of golf ball)
The potential energy of the golf ball at its maximum height is:
PE = mgh
where
h = 3.0 m (maximum height of golf ball)
Since the launcher is spring-powered, we can relate the initial kinetic energy to the potential energy using the spring constant and the distance the spring is compressed.
The initial kinetic energy can be found using the work-energy theorem:
W = KE
where
W = Fd (work done by the spring)
F = kx (force exerted by the spring)
x = 0.24 m (distance the spring can be compressed with the old spring)
k = ? (spring constant of new spring)
Substituting in the values, we get:
KE = (1/2)mv^2 = Fd = kx^2/2
Solving for k, we get:
k = (mv^2)/(x^2)
Now we can substitute in the values and solve for k:
k = (0.046 kg)(9.81 m/s^2)(1.75 m)/(0.24 m)^2 = 13.6 N/m
Therefore, Sam will need the new spring to have a spring constant of 33.7 N/m to launch the golf ball vertically to a height of 3.0 m.
If the monitoring instrument develops an inability to average, steps to take would include all the following except:?
O Posterior tribal and ulnar nerves
O An electrical stimulation is required to pace the stimulus
O Consult with the anesthesiologist anesthesia changes
O An increase in latencies and a decrease in amplitudes
Answers
When the monitoring instrument develops an inability to average, steps need to be taken including all except C: 'Consult with the anesthesiologist anesthesia changes'.
Anesthesiologists are medical doctors like family doctors and surgeons. They specialize in pain management, anesthesia care, and critical care medicine as well as have the knowledge vital to understanding and treating the human body as a whole.
So when the monitoring instrument develops an inability to average, there is no need to consult with the anesthesiologist. The required steps that need to be taken would include:
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Suppose you are asked to come up with a design for a new mobile phone that uses solar energy as its energy source. Give examples of one criterion and one constraint for this mobile phone.
Answers
The need for an effective solar power system and restrictions on using solar power for mobile devices are requirements.
What is solar energy?Any energy produced by the sun is referred to as solar energy. Solar energy is produced by the nuclear fusion that occurs in the sun. Helium atoms are produced during fusion inside the sun's core when protons from colliding hydrogen atoms fuse. Solar architecture, solar thermal energy, and solar power to generate electricity are only a few examples of the technologies that can harness the Sun's radiant light and heat.
Why solar is important and why it is used?When you generate power with solar panels, no emissions of greenhouse gases are put into the atmosphere. Solar energy is a key source of energy in the transition to the creation of clean energy since the sun produces more energy than humans could ever require.
Solar energy seems to be a cheap, abundant, and renewable source of power. It may be used to make energy, heat water, and cook meals. Solar cells can also be used to store the electrical energy produced by solar energy.
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using the bohr model, determine the energy, in joules, necessary to ionize a ground-state hydrogen atom.
Answers
The energy necessary to ionize a ground-state hydrogen atom using the Bohr model is approximately 2.18 x 10⁻¹⁸ J.
What is energy?
Energy is a physical quantity that describes the amount of work that can be done by a system or the amount of heat that can be transferred to or from a system. It is a scalar quantity and has units of joules (J) in the SI system of units. Energy can take many forms, including kinetic energy, potential energy, thermal energy, and electromagnetic energy.
The energy required to ionize a ground-state hydrogen atom can be determined using the Bohr model. According to the Bohr model, the energy of the electron in a hydrogen atom is quantized and can be calculated using the equation:
E = -(13.6 eV) / n²
where n is the principle quantum number. For the ground state (n = 1), the energy is -13.6 eV. To ionize the hydrogen atom, the electron must be removed from the atom, which requires an additional amount of energy equal to the ionization energy of the hydrogen atom.
The conversion factor from electron volts to joules is 1 eV = 1.6 x 10⁻¹⁹ J, so the ionization energy of a hydrogen atom in joules is:
E = -(13.6 eV) * (1.6 x 10⁻¹⁹ J/eV) = -2.18 x 10⁻¹⁸ J.
So, the energy necessary to ionize a ground-state hydrogen atom using the Bohr model is approximately 2.18 x 10⁻¹⁸ J.
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If a lightbulb uses 65 W of electricity, but only uses 45 W to become light energy and uses 20 W as heat energy, how efficient m is the light bulb?
Answers
Answer:
Explanation:
the 40-watt bulb is going to require less energy to power.
A woman does 236 J of work
dragging her trash can 24.4 m to
the curb, using a force of 18.9 N.
At what angle was her force
directed?
Answers
Answer:
workdone = force × distance 236J = 18.9cos(o) × 24.4236/24.4 = 18.9cos(o)(0.5117)cos^-1 = (o)59.21°
A student wants to determine the density of titanium. The student measures the mass of a solid chunk of titanium, but when he drops it into the water to determine the volume, some water splashes out of the cylinder. Will this cause the calculated density to be higher or lower than it should be? Explain!
Answers
Answer:
Lower than it should be.
Explanation:
Hello.
In this case, since the density is computed by:
\(\rho =\frac{m}{V}\)
And we obtain the volume of the solid by substracting the mass of the water and the solid minus the mass of water:
\(V_{solid}=V_{solid\ with \ water}-V_{water}\)
If some water is splashed out of the cylinder, the volume of water will be lower than originally measured, it means that the volume of the solid will be higher than real. In such a way, since the density is in an inversely proportional relationship with volume, as the volume of the solid is wrongly increased, therefore the density of the solid will be lower than in should be.
Regards.
The earth has a radius of 6.38×10^6 meters. Assume a perfectly smooth spherical earth. Calculate the minimum horizontal velocity required for an object to orbit the earth just above the surface.
Answers
The minimum horizontal velocity required for an object to orbit the earth just above the surface is 5.04 x 10¹⁰ m/s.
What is orbital speed of earth?The orbital speed of Earth or a natural satellite is the speed at which it orbits around the center of the system.
The minimum horizontal velocity required for an object to orbit the earth just above the surface is calculated as follows;
V(min) = √GMR
where;
G is universal gravitation constant = 6.67 x 10⁻¹¹Nm²/kg²M is mass of earth = 5.97 x 10²⁴ kgR is the radius of the earth = 6.38 x 10⁶ mSubstitute the given parameters and solve for the minimum orbital speed of the earth.
V(min) = √(6.67 x 10⁻¹¹ x 5.97 x 10²⁴ x 6.38 x 10⁶)
V(min) = 5.04 x 10¹⁰ m/s
Thus, the minimum horizontal velocity required for an object to orbit the earth just above the surface is 5.04 x 10¹⁰ m/s.
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1) Which of the following is considered an effective treatment for someone with hearing loss based on nerve damage?
TAD
Cochlear implant
Hearing aid
OBI
No treatment available
2) Sylvester is dealing with hearing loss. The doctor informs him that his basilar membrane is damaged. What type of hearing loss is Sylvester experiencing?
Nerve deafness
Conduction hearing loss
Cochlear hearing loss
Conduction deafness
Sensory hearing loss
Answers
Answer:
For number 1 no treatment available , number 2 cochlear hearing loss
Explanation:
nerve damage is permanent
9. What's the process that a spark represents?
A. A body with a strong positive charge is placed near a body with a neutral charge and the electrons jump between the two bodies
B. A body with a strong positive charge is placed near a body with a strong negative charge and the electrons jump between the two
C. A body with a neutral charge is placed near a body with a strong negative charge and the electrons jump between the two bodies
D. A body with a strong positive charge is placed near a body with a strong positive charge and the electrons jump hatupon the. The answer
Answers
Answer:
Sparks often indicate the presence of a high voltage, or "potential field". The higher the voltage; the farther a spark can jump across a gap, and with enough energy supplied can lead to greater discharges such as a glow or an arc.
Explanation:
1.Lõi thép máy biến áp được ghép từcác lá thép là để:
(a) Giảm tổn hao công suất do dòng điện xoáy
(b) Giảm tổn hao công suất do từ trễ
(c) Giảm tổn hao công suất do dòng điện chạy qua dây quấn
(d) Giảm tất cảcác loại tổn hao công suất.
Answers
Answer:
Option (c)
Explanation:
1.The transformer core is assembled from steel sheets to:
(a) Reduced power loss due to eddy current
(b) Reduced power loss due to hysteresis
(c) Reduced power loss due to current flowing through the winding
(d) Reduce all types of power loss.
A transformer is a device which converts the low voltage into high and vice versa.
There are two types of a transformer.
Step up: It is used to convert low voltage into high.
Step down It is used to convert high voltage into high.
It depends on the number of turns in primary and the secondary coil.
The core of the transformer is laminated and it is in the form of sheets.
By using such type of core, the power loss due to the windings is reduced.
option (c) .
A positive charge that is in an electric field experiences a force that is ______
a. perpendicular to the electric field.
b. in the same direction of the electric field.
c. zero because the speed is zero.
d. in the direction opposite to the electric field.
e. None of these is correct.
Answers
Answer:
The answer is a because its perpendicular
Explanation:
What is net force?
A. The sum of all the forces acting on an object
B. The difference between the largest and smallest forces acting on
an object
C. The largest force acting on an object
D. The smallest force acting on an object
Answers
Answer:
A. The sum of all the forces acting on an object.
Which statement best describes the circular flow model?
Answers
Where are you atera11
Answers
Answer:
? who is atera11?
Explanation:
examples of cultural lag
Answers
Answer:
when you lag in culture
Explanation:
it makes sense
Answer:
Well it could possibly be because of where you live, or if there is a strong power source or WiFi thing.
Explanation:
I’m sorry if my answers not the best I’m just doing it of my own experience from bad WiFi.
In a single-slit diffraction experiment, a coherent light source illuminates a slit in a barrier, and the resulting pattern is projected on a screen that is separated from the barrier by a distance which is very large as compared to the slit width and the wavelength of the light source. A student makes sketches of the resulting patterns. While the center of each bright or dark band is accurately represented, the shading is qualitative, and the choice of color may not reflect the wavelength of the light source. The distance from the barrier to the screen is 2.3 m, and the slit has width 7.3 μm.
A) What is the ratio of the slit width to the wavelength of the incident light?
B) What is the wavelength of the incident light, in nanometers?
C) If the screen is very wide, how many dark bands appear to one side of the central maximum?
Answers
Answer:
hsjdsdddwqdqwdd
Explanation:
A chopper’s speed increases from 35 m/s to 60 m/s in 5 seconds. What is the acceleration of this helicopter?
Answers
A chopper’s speed increases from 35 m/s to 60 m/s in 5 seconds. Therefore, the acceleration of this helicopter is 5m/s².
What do you mean by an acceleration ?The term an acceleration is the name we supply to any process where the velocity changes.
Therefore, velocity is a speed and a direction, there are only two ways for you to accelerate is change your speed or change your direction or change both.
Given:
Initial speed = 35 m/s
Final speed = 60 m/s
Time = 5 s
v = u + at
60 = 35 + a(5)
60 - 35 = 5a
25 = 5a
a = 5
Thus, the acceleration of this helicopter is 5m/s².
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A flower vase is sitting on a shelf when a gust of wind from an open
window blows it down. If the vase has a mass of 0.6 kg and the shelf is 1.5
m off the ground, what is the gravitational potential energy of the vase
before it falls?
Answers
Answer:
8.82 J
Explanation:
Recall that gravitational potential energy is defined as:
U = m * g * h
Then in our case, the gravitational potential energy U would be:
U = 0.6 * 9.8 * 1.5 J = 8.82 J
what happens to the state of a variable if it goes through a two series connected NOT gate.
Answers
The 10/90 principle can help you take control of your situation in taking responsibility of what you can change rather than in being victim of what you cannot change. Give an example of a situation that can change for you in applying this principle.
Answers
The 10/90 principle can be a powerful tool for taking control of your situation and improving your life. By taking responsibility for what you can change and focusing on your reaction to the situation, you can make positive changes in your life and become the master of your own destiny.
The 10/90 principle refers to the idea that life is made up of 10% of what happens to you and 90% of how you respond to it. In other words, you may not be able to control what happens to you, but you can control your reaction to it. By taking responsibility for what you can change rather than being a victim of what you cannot change, you can take control of your situation and improve your life.One example of a situation where the 10/90 principle could be applied is losing a job. Losing a job can be a devastating experience, and it can be easy to feel like a victim in this situation. However, by applying the 10/90 principle, you can take control of your situation and make positive changes in your life.The first step in applying the 10/90 principle in this situation would be to take responsibility for what you can change. This could mean updating your resume, networking with others in your field, and applying for new jobs. By taking action and doing what you can to find a new job, you are taking control of your situation and improving your chances of finding a new job.
The second step would be to focus on your reaction to the situation. Instead of dwelling on the negative aspects of losing your job, try to focus on the positive aspects. This could mean using the extra time to pursue a new hobby or spend more time with family and friends. By focusing on the positive aspects of the situation, you are taking control of your reaction and improving your overall well-being.
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A particle with charge +4.20 nC is in a uniform electric field E⃗ directed to the left. The charge is released from rest and moves to the left; after it has moved 6.00 cm, its kinetic energy is +2.20×10−6 J.
What is the work done by the electric force?
Answers
The work done by the electric force is 2.2 x 10⁻⁶ J.
Speed of the particleThe speed of the particle is calculated as follows;
Fd = K.E
where;
F is force of the particled is the distance traveled by the particleThe produce of electric force and the displacement of the particle is equal to work to done on the particle by the electric force.
Also, based on the principle of conservation of energy, the work done done by the electric force is equal to the kinetic energy of the particle.
Thus, the work done by the electric force is 2.2 x 10⁻⁶ J.
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The weighted rod floats with with 6cm of its length under water density (1000kg m3) .what length is under the surface when the rod floated in brine density (1200kg m3)?
Answers
The length of the rod under the surface of the water can be calculated using Archimedes’ principle. The principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.
The buoyant force is given by the formula:
Buoyant force = Density of fluid x Volume of fluid displaced x Gravity
Since the rod is floating, the buoyant force is equal to the weight of the rod. We can use this to calculate the volume of fluid displaced by the rod.
Let L be the length of the rod under the surface of the water when it floated in brine density.
The weight of the rod is given by:
Weight of rod = Density of rod x Volume of rod x Gravity
Since the rod is floating, the weight of the rod is equal to the buoyant force.
Buoyant force = Weight of rod = Density of rod x Volume of rod x Gravity
The volume of fluid displaced by the rod is given by:
Volume of fluid displaced = Volume of rod = Length of rod x Cross-sectional area of rod
Since the cross-sectional area of the rod is constant, we can write:
Buoyant force = Density of fluid x Volume of fluid displaced x Gravity Density of rod x Volume of rod x Gravity = Density of fluid x Length of rod x Cross-sectional area of rod x Gravity
Solving for L, we get:
L = (Density of rod / Density of fluid) x Length of rod
Substituting the given values, we get:
L = (1000 / 1200) x 6 cm = 5 cm
Therefore, the length of the rod under the surface of the water when it floated in brine density is 5 cm.
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