Answer:
2nm
Explanation:
Which is an example of a polyatomic ion?
Answer:
Well-known examples of such polyatomic ions are the sulfate ion (SO42–), the hydroxide ion (OH–), the hydronium ion (H3O+), and the ammonium ion (NH4+).
Explanation:
Answer:
is there more context to go with this question? Like a photo?
I will give it my best shot anyhoo
Explanation:
Polyatomic ions: they are covalently bonded groups of atoms and having a positive or negative charge caused by the formation of an ionic bond with another ion.
And if your question is anything like the one I had a few days ago on a test, your answer would be something like "Both hydroxide cation (OH -) and phostphate cation (PO 4 3 -) are polyatomic ions)
Some of our appliances have a magnet in it.
yes or no
Answer:
yes !!
Explanation:
Magnets can be found in the simplest or most complex devices you use every day. From home appliances such as the refrigerator, microwave oven and electric fan, to your company's office equipment such as computers and printers. All these devices use magnets.
Which explanation best compares the movement of particles in the three states of matter?
A.
Particles in a gas can only vibrate. In a solid, they slide against each other. In a liquid, they move freely, bouncing and bumping into each other.
B.
Particles in a solid can only vibrate. In a liquid, they slide against each other. In a gas, they move freely, bouncing and bumping into each other.
C.
Particles in a liquid can only vibrate. In a gas, they slide against each other. In a solid, they move freely, bouncing and bumping into each other.
D.
Particles in a solid can only vibrate. In a gas, they slide against each other. In a liquid, they move freely, bouncing and bumping into each other.
E.
Particles in a liquid can only vibrate. In a solid, they slide against each other. In a gas they move freely, bouncing and bumping into each other.
Answer: B
Explanation:Solids are packed thus molecules are restricted and can only vibrate. Liquids, on the other hand, molecules can move and slide against each other since they are loosely packed. Lastly, gas particles is very loosely packed so they can move freely.
Energy transfer when a moving toy car hits a tennis ball. Also, energy transfers when the tennis ball rolls and hits CDs, making the CDs fall like a domino.
Plz help me asap! I don't know the energy transfers... :(
Answer:
it would be conduction but i dont know the answer choices
Explanation:
and convection would be the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
You are running late for class and are still in the hallway when the bell rings. The tardy bell is right outside your classroom door, and your teacher is standing directly beneath it. If you are running towards the bell when it rings, which of the following best describes what you hear? (DOK 1)
Question 8 options:
A. You hear a higher pitch than your teacher
B. You hear a lower pitch than your teacher
C. You hear a louder pitch than your teacher
D. You hear the same pitch as your teacher
Answer:
C
Explanation:
You will hear a lower pitch of sound than your teacher who is directly below the bell.
The pitch of a sound refers to how high or low the sound is. If a sound is high we say that it has a high pitch and vice versa.
We must note that the closer you are the bell the higher the pitch of the bell sound you hear. Hence, you will hear a lower pitch of sound than your teacher who is directly below the bell.
Learn more about pitch of sound: https://brainly.com/question/4206267
1. What is the pressure caused on the ground by an elephant of weight 20000N
if each foot has an area of 0.2m??
Answer:
2000 pascal
Hope it helps
Two small nonconducting spheres have a total charge of 94.0 μC . Part A
When placed 31 cm apart, the force each exerts on the other is 11.5 N and is repulsive. What is the charge on each?
Q1,Q2=
Part B
What if the force were attractive?
Q1,Q2=
Answer:
Part A;
The charges are;
Q₁ = 1.32687 μC and Q₂ = 92.67313 μC
Part B
Q₁ = 95.29042 μC, Q₂ = -1.29042 μC
Explanation:
Part A
The total charge on the two nonconducting spheres = 94.0 μC
The force exerted by each on the other when placed 31 cm apart = 11.5 N
Let Q₁ = x represent the charge on one of the spheres and let Q₂ represent the charge on the other sphere
The force, 'F', exerted by a charge is given as follows;
[tex]F = k \times \dfrac{\left | Q_1 \right | \cdot \left | Q_2 \right | }{d^2}[/tex]
Where;
d = The distance between the spheres = 31 cm = 0.31 m
k = 8.9875 × 10⁹ N·m²/C²
Where F = 11.5 N
Q₁ + Q₂ = 94.0 μC
∴ Q₂ = 94.0 - Q₁ = 94.0 - x
We get;
[tex]F =11.5 = 8.9875 \times 10^9 \times \dfrac{x\times (94.0-x) \times 10^{-12}}{0.31^2}[/tex]
Therefore;
94·x - x² - 122.965 = 0
x² - 94·x + 122.965
x = (94 ± √((-94)² - 4×1×122.965))/(2 × 1)
Solving gives;
x ≈ 1.32687 × 10⁻⁶ C or x = 92.67313 × 10⁻⁶ C
Therefore, the charges are;
Q₁ = 1.32687 × 10⁻⁶ C and Q₂ = 92.67313 × 10⁻⁶ C
Q₁ = 1.32687 μC and Q₂ = 92.67313 μC
Part B
For attractive force, we have;
Q₁ + Q₂ = 94 × 10⁻⁶...(1)
[tex]11.5 = 8.9875 \times 10^9 \times \dfrac{-x\times (94.0-x)}{0.31^2} = 8.9875 \times 10^9 \times \dfrac{-Q_1\times Q_2}{0.31^2}[/tex]
-Q₁ × Q₂ = 11.5 × 0.31²/(8.9875 × 10⁹) = 1.2296523 × 10⁻¹⁰...(2)
∴ Q₂ = -1.2296523 × 10⁻¹⁰/(Q₁)
Q₁ + Q₂ = Q₁ - 1.2296523 × 10⁻¹⁰/(Q₁) = 94 × 10⁻⁶
Q₁² - 94 × 10⁻⁶·Q₁ - 1.2296523 × 10⁻¹⁰ = 0
∴ Q₁ = (94 × 10⁻⁶ ± √((-94 × 10⁻⁶)² - 4 × 1 × 1.2296523 × 10⁻¹⁰))/(2×1)
Q₁ = 9.529042 × 10⁵ C or -1.29042 × 10⁻⁶ C
Therefore, Q₁ = 9.529042 × 10⁵ C and Q₂ = -1.29042 × 10⁻⁶ C
Q₁ = 95.29042 μC and Q₂ = -1.29042 μC
Which electromagnetic waves have the longest wavelength and lowest frequencies?
O infrared waves
O ultraviolet rays
O radio waves
O gamma rays
Answer:
gamma rays
Explanation:
they have longer wave lengths than the others
A baseball sits motionless near first base on a baseball diamond. What statement best explains why the baseball remains motionless?
Answer:
Because no one is using that ball, so it is motionless
Answer:
No one is using the ball (dead ball) and therefore it is motionless and out of play
Explanation:
How can a conductor be made superconductor?
Answer:
a superconductor in a magnetic field and you'll make electric currents flow through its surface. These currents create a magnetic field that exactly cancels the original field trying to get inside the superconductor and repelling the magnetic field outside.
Explanation:
define refraction of light
Answer:
Refraction is the slowing down of light waves as they pass into a different medium and speeding as they pass out.
hope it helps. plz mark me as brainliest.
hiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiineeeedhelp
A 2,000 kg freight train is traveling on the railroad tracks from Birmingham to Mobile. It traveling at a speed of 25 m/sec. What is the kinetic energy of this train?
Answer:
The correct answer is "625,000 J".
Explanation:
The given values are:
Mass,
m = 2,000 kg
Speed,
v = 25 m/sec
As we know,
⇒ [tex]Kinetic \ energy=\frac{1}{2} (mass \times speed^2)[/tex]
Or,
⇒ [tex]K.E=\frac{1}{2}(mv^2)[/tex]
On substituting the values, we get
⇒ [tex]=\frac{1}{2}(2,000\times 25^2)[/tex]
⇒ [tex]=1000\times 625[/tex]
⇒ [tex]=625,000 \ J[/tex]
14. Red litmus paper turns ______ when it comes in touch with a(n) _______
A.blue, base
B.blue, acid
Answer:
Hello There!!
Explanation:
The answer is=>A.blue, base.
hope this helps,have a great day!!
~Pinky~
[tex]\huge{\textbf{\textsf{{\color{navy}{An}}{\purple{sw}}{\pink{er}} {\color{pink}{:}}}}}[/tex]
A.blue, base.
ThanksHope it helps.The complementary color of blue is?
Answer:
I think it's red so yeah hdjjdbebe
Help!!! Please need it fast. If correct I’ll give b
Answer:
if bother parents have brown eyes but they carry the allele for blue eyes a quarter of the kids will have blue eyes and three quarters will have brown eyes. hope this help I'm sorry if it doesn't.
Earth's plates move slowly across its surface. What will result when two
plates carrying continental crust collide?
Mountains will fall
A valley will be created
All land faults on Earth will be affected.
One plate will be subducted back into the mantle.
Two harmonic waves moving in the same direction are described by y1(x,t)=10.2sin(4x-700t) and y2(x,t)=10.2sin(4x-700t-7.9). What is the amplitude of the resultant wave at interference
Answer:
14.42 units
Explanation:
The waves are given as follows :
[tex]y_1(x,t)=10.2\sin(4x-700t)\\\\y_2(x,t)=10.2\sin(4x-700t-7.9)[/tex]
We need to find the amplitude of the resultant wave at interference. Let it be A. So,
[tex]A=\sqrt{10.2^2+10.2^2} \\\\=14.42\ units[/tex]
So, the amplitude of the resultant wave is equal to 14.42 units.
4. Mr. G has found two rocks which he needs to classify. Classify both rocks correctly based on the knowledge stated below
The star Betelgeuse is 6.1 x 10^18 m away from Earth. How old is the light we see from that star when it reaches us? There are 3.2 x 10^7 seconds in a year (1 point)
635 years old
481 years old
727 years old
559 years old
Answer:
635 years old
Explanation:
The light reaching the earth from the sun will travel at a speed called the speed of light, and this has a universal value of 3 × 10⁸ m/s. Bearing this in mind, let us calculate the age of the light reaching the Earth from the sun:
Distance of star from Earth = 6.1 × 10⁸m
Speed of light = 3 × 10⁸ m/s
We have distance and speed, let us calculate the time of travel of the light from the star to the earth.
Distance = speed × time
6.1 × 10⁸ = 3 × 10⁸ × time
[tex]time = \frac{6.1 \times 10^{18}}{3 \times 10^8}[/tex]
In order to do the division above, we will divide the whole numbers normally, then we will apply the law of indices to the power that says:
Xᵃ ÷ Xᵇ = X⁽ᵃ⁻ᵇ⁾
[tex]\therefore time = \frac{6.1 \times 10^{18}}{3 \times 10^8}\\= \frac{2.03 \times 10^{(18-8)}}{1} \\= 2.03 \times 10^{10}}\ seconds[/tex]
Next, we are told that there are 3.2 × 10⁷ seconds in a year.
∴ The number of years travelled by the light from the star:
[tex]3.2\ \times 10^7\ seconds = 1\ year\\1\ second = \frac{1}{3.2\ \times 10^7} \\\therefore 2.03 \times 10^{10}\ seconds = \frac{2.03 \times 10^{10}}{3.2\ \times 10^7}[/tex]
please note that:
2.03 × 10¹⁰ = 20300000000
3.2 × 10⁷ = 32000000
[tex]\therefore \frac{2.03 \times 10^{10}}{3.2\ \times 10^7}\\= \frac{20300000000}{32000000} \\\\= \frac{20300}{32} \\= 634.347\ years\\[/tex]
The closest answer in the option is 635 years, and we are short of this by some points due probably to approximations in the calculation.
A rod is given a charge of +16.7 UC, how many extra protons does It contain?
Answer:
We know that the electronic charge is 1.6 E-19 coulombs
Therefore 1 coulomb of charge contains 1.6 E19 electrons
A charge of 16.7 E6 coulombs therefore contains
N = 16.7 E6 * 1.6 * E-19 = 2.67 E-12 electrons
Also, the charge on the proton equals that on the electron
list down the different phases of the Moon
Answer:
new Moon.
waxing crescent Moon.
first quarter Moon.
waxing gibbous Moon.
full Moon.
waning gibbous Moon.
last quarter Moon.
waning crescent Moon.
Explanation:
Answer:
NEW MOON
WAXING CRESCENT
FIRST QUARTER
WAXING GIBBOUS
FULL MOON
THIRD QUARTER
WANING GIBBOUS
WANING CRESCENT
Explanation:
HOPE IT HELPS
A 1.2 m long wave travels 11.2 m to a wall and back again in 4.0 s. What is
the FREQUENCY of the wave*
Answer:
f = 4.67 Hz
Explanation:
We can approximate the wave as a traveling wave, therefore the speed of the wave is constant
v = d / t
the total distance remember, in going to the wall and back is
d = 2 11.2 = 22.4 me
we substitute
v = 22.4 / 4.0
v = 5.6 m / s
now we can use the relationship between the speed of the wave, its wavelength and u frequency
v =λ f
f = v /λ
f = 5.6 / 1.2
f = 4.67 Hz
what is newton's second law of motion?
Answer:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Explain why a person cannot dive in the Mariana Trench in the Pacific Ocean to a depth of approx. 11,000 m without appropriate protective equipment
Answer:
Plzzzz answer fast......
Which direction will thermal energy flow if you pick up a snowball with your bare hand? Thermal energy will flow from the snowball to your hand. Thermal energy will flow from your hand to the snowball. Thermal energy will not flow between your hand and the snowball.
Answer:
b. Thermal energy will flow from your hand to the snowball.
Explanation:
Answer:
B
Explanation:
A rock with a mass of 6 grams has greater thermal energy than a rock with a mass of 7 grams. True or false?
Answer:
Explanation:
False
Which pair of sentences best describes a scientific discovery in A Black Hole Is NOT a Hole by Carolyn Cinami DeCristofano?
The answer is C.
Answer:
A question with an Answer? Wowza!
Explanation:
Answer:
First, scientists studied radio waves coming from space. Next, other scientists used their discoveries to identify black holes.
Explanation:
hope this helped
It is a good idea to read or exchange text messages during all of the following times EXCEPT:
A.
while driving a car
B.
while eating lunch
C.
while waiting at the doctor's office
D.
while riding a bus
Please select the best answer from the choices provided.
A
B
C
D
Answer: A while driving a car. It is unsafe
Answer:
It is a good idea to read or exchange text messages during all of the following times except while driving a car.
Explanation:
Eating lunch and using your phone is very safe. The only way I can see it being bad is if you handed your phone to some toddlers and took it back without wiping it off!
If you're waiting for your appointment or waiting to reach your destination, then there is also no harm. As long as you are not driving the bus or you're not the doctor working on patients while texting, then this should be alright.
This leaves us with driving. The commercials tell us. Common knowledge tells us. Hopefully, parents or colleagues or even your own kids (I've had to do this to my dad countless times before) have told you this...
DO NOT TEXT WHILE DRIVING.
So many accidents happen solely for this reason. People, just put down the phone and wait 'til you're at a red light or, even better, when you reach your destination.
So no, it is not a good idea to read OR exchange text messages while driving. Any other time? Well, go ahead! But if you're in that driver seat and your currently in the road with other cars, take into consideration the fact you are not the only person there. Keep everyone safe and drop that phone!
....
My bad, I got long winded. Hope this helped!
Source(s): TV Commercials, myself.
2. The force between charges is 7 N. The distance between the charges is 4 x 10-6 m. If one of the charges is 2 x 10-8 C, what is the strength of the other charge?
3. A pair of equal charges are separated by .75 m. There's a 2500 N force acting on them. What is the strength of the charge?
Plz help!!!!!!
Answer:
2) 6.22 × 10^-13
3) 4.56 × 10^-4
Explanation: